Latest revision as of 01:19, 28 February 2025

Welcome to Pgpool Wiki!

What is Pgpool-II?

Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is distributed under a license similar to BSD and MIT. It provides the following features.

Connection Pooling

Pgpool-II saves connections to the PostgreSQL servers, and reuse them whenever a new connection with the same properties (i.e. username, database, protocol version) comes in. It reduces connection overhead, and improves system's overall throughput.

Replication

Pgpool-II can manage multiple PostgreSQL servers. Using the replication function enables creating a realtime backup on 2 or more physical disks, so that the service can continue without stopping servers in case of a disk failure.

Load Balancing

If a database is replicated, executing a SELECT query on any server will return the same result. Pgpool-II takes an advantage of the replication feature to reduce the load on each PostgreSQL server by distributing SELECT queries among multiple servers, improving system's overall throughput. At best, performance improves proportionally to the number of PostgreSQL servers. Load balance works best in a situation where there are a lot of users executing many queries at the same time.

Limiting Exceeding Connections

There is a limit on the maximum number of concurrent connections with PostgreSQL, and connections are rejected after this many connections. Setting the maximum number of connections, however, increases resource consumption and affect system performance. pgpool-II also has a limit on the maximum number of connections, but extra connections will be queued instead of returning an error immediately.

Watchdog

Watchdog can coordinate multiple Pgpool-II, create a robust cluster system and avoid the single point of failure or split brain. Watchdog can perform lifecheck against other pgpool-II nodes, to detect a fault of Pgpoll-II. If active Pgpool-II goes down, standby Pgpool-II can be promoted to active, and take over Virtual IP.

In Memory Query Cache

In memory query cache allows to save a pair of SELECT statement and its result. If an identical SELECTs comes in, Pgpool-II returns the value from cache. Since no SQL parsing nor access to PostgreSQL are involved, using in memory cache is extremely fast. On the other hand, it might be slower than the normal path in some cases, because it adds some overhead of storing cache data.

Pgpool-II speaks PostgreSQL's backend and frontend protocol, and relays messages between a backend and a frontend. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.

Pgpool-II License

See License.

Stable versions

Pgpool-II: 4.6, 4.5, 4.4, 4.3, 4.2

Contacts

If you have technical questions regarding Pgpool-II, please subscribe Pgpool-II mailing lists and send questions to it (pgpool-general will be a starter). Please do not send technical questions via private email. We will not respond such that messages.

If you believe that you found a vulnerability/security issues with Pgpool-II, please send a private email to ishii at postgresql.org (he is the project leader).

What's new

News

Pgpool-II 4.6.0 officially released (2025/02/28)

Pgpool-II 4.6.0 is now released. This is the first stable release of Pgpool-II 4.6.x.

V4.6 contains new features and enhancements, including:

New PCP command to trigger log rotation.

Allow logging_collector related parameters to be changed by reloading.

New PCP command to invalidate query cache.

Allow to force to create query cache

New PGPOOL SET CACHE DELETE command.

New configuration parameter log_backend_messages.

Import PostgreSQL 17's SQL parser.

Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.

You can download it from here.

Release notes: English

Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released (2025/02/28)

Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released.

You can download them here.

4.5.6 : English Japanese
4.4.11 : English Japanese
4.3.14 : English Japanese
4.2.21 : English Japanese

Events

PostgreSQL Conference in Russia 2016

Tatsuo gave a talk "How to manage a herd of elephants" at "PostgreSQL Conference in Russia 2016", held in Moscow from February 4th to 5th. The slides are available in Developer's documentation.

PostgreSQL Conference in China 2015

Tatsuo gave a talk "How to manage a herd of elephants" at "PostgreSQL Conference in China 2015", held in Beijing from November 21th to 22th. The slides are available in Developer's documentation.

pgCon 2015 Cluster Hacker Summit

We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in Developer's documentation.

Pgpool-II Day 2015 in Tokyo

We had the very first time pgpool-II decicated conference. See the event report.

Stable

Pgpool-II 4.6.0 officially released (2025/02/28)

Pgpool-II 4.6.0 is now released. This is the first stable release of Pgpool-II 4.6.x.

V4.6 contains new features and enhancements, including:

New PCP command to trigger log rotation.

Allow logging_collector related parameters to be changed by reloading.

New PCP command to invalidate query cache.

Allow to force to create query cache

New PGPOOL SET CACHE DELETE command.

New configuration parameter log_backend_messages.

Import PostgreSQL 17's SQL parser.

Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.

You can download it from here.

Release notes: English

Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released (2025/02/28)

Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released.

You can download them here.

4.5.6 : English Japanese
4.4.11 : English Japanese
4.3.14 : English Japanese
4.2.21 : English Japanese

Pgpool-II 4.5.5, 4.4.10, 4.3.13, 4.2.20 and 4.1.23 officially released (2024/11/28)

Pgpool-II 4.5.5, 4.4.10, 4.3.13, 4.2.20 and 4.1.23 officially released.

Please note that 4.1.23 is the last release of the 4.1.x series.

You can download them here.

4.5.5 : English Japanese
4.4.10 : English Japanese
4.3.13 : English Japanese
4.2.20 : English Japanese
4.1.23 : English Japanese

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09)

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released.

This release contains a security fix.

When the query cache feature is enabled, it was possible that a database user can read rows from tables that should not be visible for the user through query cache (CVE-2024-45624).

All versions of Pgpool-II older than 4.5.4, 4.4.9, 4.3.12, 4.2.19, 4.1.22, and all older versions that has the query cache feature (the query cache feature was implemented in 3.2) are affected by the vulnerability. It is strongly recommend to upgrade to Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 or later. Or you should better turn off the query cache feature.

You can download them here.

4.5.4 : English Japanese
4.4.9 : English Japanese
4.3.12 : English Japanese
4.2.19 : English Japanese
4.1.22 : English Japanese

Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released (2024/08/15)

Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released.

You can download them here.

4.5.3 : English Japanese
4.4.8 : English Japanese
4.3.11 : English Japanese
4.2.18 : English Japanese
4.1.21 : English Japanese

Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released (2024/05/16)

Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released.

You can download them here.

4.5.2 : English Japanese
4.4.7 : English Japanese
4.3.10 : English Japanese
4.2.17 : English Japanese
4.1.20 : English Japanese

Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released (2024/02/29)

Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released.

You can download them here.

4.5.1 : English Japanese
4.4.6 : English Japanese
4.3.9 : English Japanese
4.2.16 : English Japanese
4.1.19 : English Japanese

Pgpool-II 4.5.0 released (2023/12/12)

Pgpool-II 4.5.0 is now released. This is the first stable release of Pgpool-II 4.5.x.

V4.5 contains new features and enhancements, including:

Allow to use more kind of multiple statements in a query string.

Allow to load balance PREPARE/EXECUTE/DEALLOCATE.

Allow to set delay_threshold_by_time in milliseconds.

Avoid session disconnection issue in failover/failback/backend error in some cases.

Allow to route queries to a specific backend node for a specific user connection.

Support multiple directories specification for pcp_socket_dir.

Import PostgreSQL 16's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released (2023/11/30)

Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released.

Please note that 4.0.25 is the last release of the 4.0.x series.

You can download them here.

4.4.5 : English Japanese
4.3.8 : English Japanese
4.2.15 : English Japanese
4.1.18 : English Japanese
4.0.25 : English Japanese

Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released (2023/08/17)

Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released.

You can download them here.

4.4.4 : English Japanese
4.3.7 : English Japanese
4.2.14 : English Japanese
4.1.17 : English Japanese
4.0.24 : English Japanese

Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released (2023/05/18)

Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released.

You can download them here.

4.4.3 : English Japanese
4.3.6 : English Japanese
4.2.13 : English Japanese
4.1.16 : English Japanese
4.0.23 : English Japanese

End-of-Life (EOL) Announcement for pgpoolAdmin (2023/02/17)

Pgpool Global Development Group announces end-of-life date for pgpoolAdmin, which is the management tool for Pgpool-II.

Pgpool Global Development Group will provide maintenance for pgpoolAdmin 4.0, 4.1 and 4.2 until December 31, 2023. After this date, bug fixes and security fixes for these versions will no longer be provided.

In addition, pgpoolAdmin for Pgpool-II 4.3 or later will not be released.

We would like to thank you for using pgpoolAdmin over the years.

Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released (2023/01/23)

Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released.

This release contains a security fix.

If following conditions are all met, the password of "wd_lifecheck_user" is exposed by "SHOW POOL STATUS" command. The command can be executed by any user who can connect to Pgpool-II. (CVE-2023-22332)

Version 3.3 or later
use_watchdog = on
wd_lifecheck_method = 'query'
A plain text password is set to wd_lifecheck_password

In this case it is strongly recommended to upgrade to this version (we do not expose wd_lifecheck_password in show pool_status command any more), or use one of following workarounds.

Workarounds for 4.0.x to 4.4.x users:

Disable watchdog. Set use_watchdog to off.
Change wd_lifecheck_method to heartbeat.
Set an empty string to wd_lifecheck_password. This will use password in the pool_passwd file.
Set an AES encrypted password to wd_lifecheck_password.

In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.

Workarounds for 3.0.x to 3.7.x users:

Disable watchdog. Set use_watchdog to off.
Change wd_lifecheck_method to heartbeat.

In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.

Please note that Pgpool-II 3.7.x or before are end of life and no minor updates are provided for those versions.

You can download them here.

4.4.2 : English Japanese
4.3.5 : English Japanese
4.2.12 : English Japanese
4.1.15 : English Japanese
4.0.22 : English Japanese

Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released (2022/12/22)

Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released.

You can download them here.

4.4.1 : English Japanese
4.3.4 : English Japanese
4.2.11 : English Japanese
4.1.14 : English Japanese
4.0.21 : English Japanese
3.7.26 : English Japanese

Pgpool-II 4.4.0 released (2022/12/06)

Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.

V4.4 contains new features and enhancements, including:

Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.

Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.

As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.

Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.

Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.

Import PostgreSQL 15's SQL parser.

Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English Japanese

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18)

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released.

You can download them here.

4.3.3 : English Japanese
4.2.10 : English Japanese
4.1.13 : English Japanese
4.0.20 : English Japanese
3.7.25 : English Japanese

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19)

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released.

You can download them here.

4.3.2 : English Japanese
4.2.9 : English Japanese
4.1.12 : English Japanese
4.0.19 : English Japanese
3.7.24 : English Japanese

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17)

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released.

You can download them here.

4.3.1 : English Japanese
4.2.8 : English Japanese
4.1.11 : English Japanese
4.0.18 : English Japanese
3.7.23 : English Japanese

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23)

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released.

The purpose of this release is to provide packages for PostgreSQL 14.

You can download them here.

4.2.7 : English Japanese
4.1.10 : English Japanese
4.0.17 : English Japanese
3.7.22 : English Japanese

Pgpool-II 4.3.0 released (2021/12/07)

Pgpool-II 4.3.0 is now released. Please take a look at 4.3.0

V4.3.0 contains new features and enhancements, including:

A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.

Allow to choose the least replication delay standby node when selecting the load balance node.

Allow to specify the node id to be promoted in pcp_promote_node.

Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.

Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.

Allow pcp_node_info to list all backend nodes information.

Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.

Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.

Add support for log time stamp with milliseconds.

Import PostgreSQL 14's SQL parser.

Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.

pgpool.conf sample files are unified into single sample file for easier configuration.

All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18)

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.

You can download them here.

4.2.6 : English Japanese
4.1.9 : English Japanese
4.0.16 : English Japanese
3.7.21 : English Japanese
3.6.28 : English Japanese

Pgpool-II 4.2.5 released (2021/09/14)

Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.

You can download them here.

4.2.5 : English Japanese

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05)

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.

You can download them here.

4.2.4 : English Japanese
4.1.8 : English Japanese
4.0.15 : English Japanese
3.7.20 : English Japanese
3.6.27 : English Japanese

pgpoolAdmin 4.2.0 officially released (2021/06/17)

pgpoolAdmin 4.2.0 officially released.

pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2. Please take a look at release notes.

You can download them here.

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20)

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.

You can download them here.

4.2.3 : English Japanese
4.1.7 : English Japanese
4.0.14 : English Japanese
3.7.19 : English Japanese
3.6.26 : English Japanese

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18)

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.

You can download them here.

4.2.2 : English Japanese
4.1.6 : English Japanese
4.0.13 : English Japanese
3.7.18 : English Japanese
3.6.25 : English Japanese

Pgpool-II 4.2.1 released (2020/12/23)

Pgpool-II 4.2.1 is now released.

You can download them from here.

4.2.1 : English Japanese

Pgpool-II 4.2.0 released (2020/11/26)

Pgpool-II 4.2.0 is now released.

V4.2 contains new features and enhancements, including:

Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.

Implement logging_collector for easier log management.

Implement log_disconnections to collect disconnection logs.

Implement pg_enc and pg_md5 to allow to register multiple passwords at once.

Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.

New PCP command pcp_reload_config is added.

Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.

Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.

Support LDAP authentication between clients and Pgpool-II.

Add ssl_crl_file and ssl_passphrase_command to SSL configuration.

Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Development

Pgpool-II 4.6 RC1 released (2025/02/20)

Pgpool-II 4.6 RC1 is now released.

Note that this is not a stable version but just for developers.

V4.6 contains new features and enhancements, including:

New PCP command to trigger log rotation.

Allow logging_collector related parameters to be changed by reloading.

New PCP command to invalidate query cache.

Allow to force to create query cache

New PGPOOL SET CACHE DELETE command.

New configuration parameter log_backend_messages.

Import PostgreSQL 17's SQL parser.

Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.

You can download it from here.

Release notes: English

Pgpool-II 4.6 beta1 released (2025/02/13)

Pgpool-II 4.6 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.6 contains new features and enhancements, including:

New PCP command to trigger log rotation.

Allow logging_collector related parameters to be changed by reloading.

New PCP command to invalidate query cache.

Allow to force to create query cache

New PGPOOL SET CACHE DELETE command.

New configuration parameter log_backend_messages.

Import PostgreSQL 17's SQL parser.

Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.

You can download it from here.

Release notes: English

Pgpool-II 4.5 RC1 released (2023/11/28)

Pgpool-II 4.5 RC1 is now released.

Note that this is not a stable version but just for developers.

V4.5 contains new features and enhancements, including:

Allow to use multiple statements in a query string.

Allow to set delay_threshold_by_time in milliseconds.

Avoid session disconnection issue in failover/failback/backend error in some cases.

Allow to route queries to a specific backend node for a specific user connection.

Support multiple directories specification for pcp_socket_dir.

Import PostgreSQL 16's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.5 beta1 released (2023/11/14)

Pgpool-II 4.5 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.5 contains new features and enhancements, including:

Allow to use multiple statements in a query string.

Allow to set delay_threshold_by_time in milliseconds.

Avoid session disconnection issue in failover/failback/backend error in some cases.

Allow to route queries to a specific backend node for a specific user connection.

Support multiple directories specification for pcp_socket_dir.

Import PostgreSQL 16's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.4 RC1 released (2022/11/22)

Pgpool-II 4.4 RC1 is now released.

Note that this is not a stable version but just for developers.

V4.4 contains new features and enhancements, including:

Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.

Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.

As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.

Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.

Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.

Import PostgreSQL 15's SQL parser.

Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English

Pgpool-II 4.4 beta1 released (2022/11/14)

Pgpool-II 4.4 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.4 contains new features and enhancements, including:

Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.

Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.

As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.

Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.

Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.

Import PostgreSQL 15's SQL parser.

Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English

Pgpool-II 4.3 RC1 released (2021/11/25)

Pgpool-II 4.3 RC1 is now released. Please take a look at 4.3 RC1

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.

Allow to choose the least replication delay standby node when selecting the load balance node.

Allow to specify the node id to be promoted in pcp_promote_node.

Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.

Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.

Allow pcp_node_info to list all backend nodes information.

Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.

Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.

Add support for log time stamp with milliseconds.

Import PostgreSQL 14's SQL parser.

Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.

pgpool.conf sample files are unified into single sample file for easier configuration.

All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.3 beta2 released (2021/11/18)

Pgpool-II 4.3 beta2 is now released. Please take a look at 4.3 beta2

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.

Allow to choose the least replication delay standby node when selecting the load balance node.

Allow to specify the node id to be promoted in pcp_promote_node.

Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.

Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.

Allow pcp_node_info to list all backend nodes information.

Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.

Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.

Add support for log time stamp with milliseconds.

Import PostgreSQL 14's SQL parser.

Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.

pgpool.conf sample files are unified into single sample file for easier configuration.

All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.3 beta1 released (2021/11/09)

Pgpool-II 4.3 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.

Allow to choose the least replication delay standby node when selecting the load balance node.

Allow to specify the node id to be promoted in pcp_promote_node.

Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.

Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.

Allow pcp_node_info to list all backend nodes information.

Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.

Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.

Add support for log time stamp with milliseconds.

Import PostgreSQL 14's SQL parser.

Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.

pgpool.conf sample files are unified into single sample file for easier configuration.

All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.2 beta1 released (2020/10/27)

Pgpool-II 4.2 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.2 contains new features and enhancements, including:

Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.

Implement logging_collector for easier log management.

Implement log_disconnections to collect disconnection logs.

Implement pg_enc and pg_md5 to allow to register multiple passwords at once.

Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.

New PCP command pcp_reload_config is added.

Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.

Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.

Support LDAP authentication between clients and Pgpool-II.

Add ssl_crl_file and ssl_passphrase_command to SSL configuration.

Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.2 alpha1 released (2020/10/06)

Pgpool-II 4.2 alpha1 is now released.

Note that this is not a stable version but just for developers.

V4.2 contains new features and enhancements, including:

Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.

Implement logging_collector for easier log management.

Implement log_disconnections to collect disconnection logs.

Implement pg_enc and pg_md5 to allow to register multiple passwords at once.

Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.

New PCP command pcp_reload_config is added.

Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.

Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.

Support LDAP authentication between clients and Pgpool-II.

Add ssl_crl_file and ssl_passphrase_command to SSL configuration.

Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Old

See this page.

Where can I get commercial support for Pgpool-II?

Some commercial packages include Pgpool-II support. Consulting and annual support can be purchased from SRA OSS LLC (https://www.sraoss.co.jp/index_en.php).

@@ Line 2: / Line 2: @@
 '''MediaWiki has been successfully installed.'''
-Consult the [http://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.
+Consult the [https://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.
 == Getting started ==
-* [http://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
+* [https://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
-* [http://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
+* [https://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
 * [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 -->
+<!-- MAINTENANCE MESSAGE -->
+<!--
+<font color="red">
+'''[!] Server maintenance'''
-<!-- MAINTENANCE MESSAGE -->
+The pgpool.net server will be shut down for maintenance work
+from 12:00 JST (UTC+0900) to 13:00 JST (UTC+0900), Tue, 28 May 2024.
+All services on pgpool.net will be unavailable for the maintenance period.
+Sorry for inconvenience.
+</font>
+-->
 <!--
 <font color="red">
@@ Line 17: / Line 26: @@
 The pgpool.net server will be shut down for maintenance work
-from 04:00 JST (UTC+0900) to 21:00 JST (UTC+0900), Sat, 15th September 2018.
+from 12:00 JST (UTC+0900) to 13:00 JST (UTC+0900), on Thursday, February 20, 2025.
 All services on pgpool.net will be unavailable for the maintenance period.
 Sorry for inconvenience.
+</font>
+-->
+<!--
+<font color="red">
+Server maintenance has finished. Most of the functionalities are working but the mailing lists do not work at this moment. Our engineers are working on it. Thank you for your patient.
 </font>
 -->
@@ Line 27: / Line 41: @@
 == What is Pgpool-II? ==
-Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is licensed under BSD license. It provides the following features.
+Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is distributed under a license similar to BSD and MIT. It provides the following features.
 * '''Connection Pooling'''
@@ Line 41: / Line 55: @@
 : There is a limit on the maximum number of concurrent connections with PostgreSQL, and connections are rejected after this many connections. Setting the maximum number of connections, however, increases resource consumption and affect system performance. pgpool-II also has a limit on the maximum number of connections, but extra connections will be queued instead of returning an error immediately.
-Pgpool-II talks PostgreSQL's backend and frontend protocol, and relays a connection between them. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.
+* '''Watchdog'''
+: Watchdog can coordinate multiple Pgpool-II, create a robust cluster system and avoid the single point of failure or split brain. Watchdog can perform lifecheck against other pgpool-II nodes, to detect a fault of Pgpoll-II. If active Pgpool-II goes down, standby Pgpool-II can be promoted to active, and take over Virtual IP.
+* '''In Memory Query Cache'''
+: In memory query cache allows to save a pair of SELECT statement and its result. If an identical SELECTs comes in, Pgpool-II returns the value from cache. Since no SQL parsing nor access to PostgreSQL are involved, using in memory cache is extremely fast. On the other hand, it might be slower than the normal path in some cases, because it adds some overhead of storing cache data.
+Pgpool-II speaks PostgreSQL's backend and frontend protocol, and relays messages between a backend and a frontend. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.
 == Pgpool-II License ==
-See [http://pgpool.net/mediawiki/index.php/pgpool-II_License License].
+See [https://pgpool.net/mediawiki/index.php/pgpool-II_License License].
 == Stable versions ==
-* Pgpool-II: 3.7, 3.6, 3.5, 3.4
+* Pgpool-II: 4.6, 4.5, 4.4, 4.3, 4.2
-* pgpoolAdmin: 3.7, 3.6, 3.5, 3.4
 == Contacts ==
-* If you have technical questions regarding Pgpool-II, please subscribe [http://pgpool.net/mediawiki/index.php/Mailing_lists Pgpool-II mailing lists] and send questions to it (pgpool-general will be a starter). Please '''do not''' send technical questions via private email. We will not respond such that messages.
+* If you have technical questions regarding Pgpool-II, please subscribe [https://pgpool.net/mediawiki/index.php/Mailing_lists Pgpool-II mailing lists] and send questions to it (pgpool-general will be a starter). Please '''do not''' send technical questions via private email. We will not respond such that messages.
-* If you believe that you found a vulnerability/security issues with Pgpool-II, please send a '''private email''' to ishii at sraoss.co.jp (he is the project leader).
+* If you believe that you found a vulnerability/security issues with Pgpool-II, please send a '''private email''' to ishii at postgresql.org (he is the project leader).
 = What's new =
@@ Line 62: / Line 81: @@
 == News ==
-=== Pgpool-II 4.0.0 and pgpoolAdmin 4.0.0 officially released (2018/10/19) ===
+=== Pgpool-II 4.6.0 officially released (2025/02/28) ===
+Pgpool-II 4.6.0 is now released. This is the first stable release of Pgpool-II 4.6.x.
+V4.6 contains new features and enhancements, including:
+* New PCP command to trigger log rotation.
+* Allow logging_collector related parameters to be changed by reloading.
+* New PCP command to invalidate query cache.
-Pgpool-II 4.0.0 and pgpoolAdmin 4.0.0 are now relased.
+* Allow to force to create query cache
-V4.0 has new features:
+* New PGPOOL SET CACHE DELETE command.
-* Add SCRAM and Certificate authentication support.
+* New configuration parameter log_backend_messages.
-* Detecting "false" primary server of PostgreSQL.
-* Improvements to load balancing:
+* Import PostgreSQL 17's SQL parser.
-** More load balancing fine control after write queries.
-** Load balancing control for specific queries.
+* Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.
-** Allow to specify load balance weight ratio for load balance parameters.
-* Add last state change timestamp to SHOW POOL NODES.
-* Import PostgreSQL 11 SQL parser.
-* Logging client messages.
-* etc.
 You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
 Release notes:
-[https://www.pgpool.net/docs/latest/en/html/release-4-0.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0.html Japanese]
+[https://www.pgpool.net/docs/46/en/html/release-4-6-0.html English]
+=== Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released (2025/02/28) ===
+Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+* 4.5.6  :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-6.html Japanese]
+* 4.4.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-11.html Japanese]
+* 4.3.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-14.html Japanese]
+* 4.2.21 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-21.html Japanese]
 == Events ==
+=== PGConf.ASIA 2019 in Bali ===
+Bo Peng is going to give a presentation [https://www.sraoss.co.jp/event_seminar/2019/PGConf.ASIA.Bali.2019-PENG.pdf Setup a High-Availability and Load Balancing PostgreSQL Cluster: New Features of Pgpool-II 4.1] at [https://2019.pgconf.asia/ "PGConf.ASIA 2019"] held in Bali from September 8th to 11st.
+=== PGConf.ASIA 2018 in Tokyo ===
+Tatsuo Ishii and Bo Peng are going to give a presentation
+[https://www.pgpool.net/download.php?f=pgpool-past-now-and-future.pdf Celebrating its 15th Anniversary Pgpool-II Past Present and Future]
+[https://www.pgpool.net/download.php?f=pgpool-past-now-and-future-part2.pdf Celebrating its 15th Anniversary Pgpool-II Past Present and Future part2] at [https://www.pgconf.asia/EN/2018/day1/#B4 "PGConf.ASIA 2018"] held in Tokyo from December 10th to 12th.
 === PGConf.ASIA 2017 in Tokyo ===
-Tatsuo Ishii is going to give a presentation  [http://www.pgconf.asia/EN/2017/day-2/#B5 "More reliability and support for PostgreSQL 10: Introducing Pgpool-II 3.7"] at [http://www.pgconf.asia/EN/2017/ "PGConf.ASIA 2017"], held in Tokyo from December 4th to 6th.
+Tatsuo Ishii is going to give a presentation  [https://www.pgconf.asia/EN/2017/day-2/#B5 "More reliability and support for PostgreSQL 10: Introducing Pgpool-II 3.7"] at [https://www.pgconf.asia/EN/2017/ "PGConf.ASIA 2017"], held in Tokyo from December 4th to 6th.
 === PostgreSQL Conference in Russia 2016 ===
 Tatsuo gave a talk "How to manage a herd of elephants" at [https://pgconf.ru/en "PostgreSQL Conference in Russia 2016"], held in Moscow from February 4th to 5th.
-The slides are available in [http://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
+The slides are available in [https://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
 === PostgreSQL Conference in China 2015 ===
-Tatsuo gave a talk "How to manage a herd of elephants" at [http://www.eventdove.com/event/106042 "PostgreSQL Conference in China 2015"], held in Beijing from November 21th to 22th.
+Tatsuo gave a talk "How to manage a herd of elephants" at [https://www.eventdove.com/event/106042 "PostgreSQL Conference in China 2015"], held in Beijing from November 21th to 22th.
-The slides are available in [http://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
+The slides are available in [https://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
 === pgCon 2015 Cluster Hacker Summit ===
-We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in [http://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
+We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in [https://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
 === Pgpool-II Day 2015 in Tokyo ===
-We had the very first time pgpool-II decicated conference. See the [http://pgpool.net/mediawiki/index.php/pgpool-II_Day_2015 event report].
+We had the very first time pgpool-II decicated conference. See the [https://pgpool.net/mediawiki/index.php/pgpool-II_Day_2015 event report].
+== Stable ==
+=== Pgpool-II 4.6.0 officially released (2025/02/28) ===
+Pgpool-II 4.6.0 is now released. This is the first stable release of Pgpool-II 4.6.x.
+V4.6 contains new features and enhancements, including:
+* New PCP command to trigger log rotation.
+* Allow logging_collector related parameters to be changed by reloading.
+* New PCP command to invalidate query cache.
+* Allow to force to create query cache
+* New PGPOOL SET CACHE DELETE command.
+* New configuration parameter log_backend_messages.
+* Import PostgreSQL 17's SQL parser.
+* Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.
+You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+Release notes:
+[https://www.pgpool.net/docs/46/en/html/release-4-6-0.html English]
+=== Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released (2025/02/28) ===
+Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-== New docs ==
+* 4.5.6  :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-6.html Japanese]
+* 4.4.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-11.html Japanese]
+* 4.3.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-14.html Japanese]
+* 4.2.21 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-21.html Japanese]
-=== pgpool-II 3.5 is coming soon! ===
+=== Pgpool-II 4.5.5, 4.4.10, 4.3.13, 4.2.20 and 4.1.23 officially released (2024/11/28) ===
-pgpool-II 3.5 alpha1 has been out. Tatsuo introduces [http://pgpool.net/mediawiki/index.php?title=pgpool-II_3.5_features&redirect=no "new features of pgpool-II 3.5."]
+Pgpool-II 4.5.5, 4.4.10, 4.3.13, 4.2.20 and 4.1.23 officially released.
-== Stable ==
+Please note that 4.1.23 is the last release of the 4.1.x series.
-=== Pgpool-II 3.7.5, 3.6.12, 3.5.16, 3.4.19 and 3.3.22 officially released (2018/07/31) ===
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-Pgpool-II 3.7.5, 3.6.12, 3.5.16, 3.4.19 and 3.3.22 officially released
+* 4.5.5  :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-5.html Japanese]
+* 4.4.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-10.html Japanese]
+* 4.3.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-13.html Japanese]
+* 4.2.20 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-20.html Japanese]
+* 4.1.23 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-23.html Japanese]
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09) ===
-* 3.7.5 :  [http://www.pgpool.net/docs/latest/en/html/release-3-7-5.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7-5.html Japanese]
+Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released.
-* 3.6.12 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-12.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-12.html Japanese]
-* 3.5.16 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-16.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-16.html Japanese]
-* 3.4.19:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-19.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-19.html Japanese]
-* 3.3.22:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-22.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-22.html Japanese]
-Please note that 3.3.22 is the last release of 3.3 series because 5 years has passed since 3.3 was out (2013/07/30).
+This release contains a security fix.
-=== Pgpool-II 3.7.4, 3.6.11, 3.5.15 and 3.4.18 officially released (2018/06/12) ===
+When the query cache feature is enabled, it was possible that a database user can read rows from tables that should not be visible for the user through query cache (CVE-2024-45624).
-Pgpool-II 3.7.4, 3.6.11, 3.5.15 and 3.4.18 officially released
+All versions of Pgpool-II older than 4.5.4, 4.4.9, 4.3.12, 4.2.19, 4.1.22, and all older versions that has the query cache feature (the query cache feature was implemented in 3.2) are affected by the vulnerability.
+It is strongly recommend to upgrade to Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 or later. Or you should better turn off the query cache feature.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-* 3.7.4 :  [http://www.pgpool.net/docs/latest/en/html/release-3-7-4.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7-4.html Japanese]
+* 4.5.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-4.html Japanese]
-* 3.6.11 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-11.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-11.html Japanese]
+* 4.4.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-9.html Japanese]
-* 3.5.15 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-15.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-15.html Japanese]
+* 4.3.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-12.html Japanese]
-* 3.4.18:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-18.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-18.html Japanese]
+* 4.2.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-19.html Japanese]
+* 4.1.22 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-22.html Japanese]
-=== Pgpool-II 3.7.3, 3.6.10, 3.5.14, 3.4.17 and 3.3.21 officially released (2018/04/17) ===
+=== Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released (2024/08/15) ===
-Pgpool-II 3.7.3, 3.6.10, 3.5.14, 3.4.17 and 3.3.21 officially released
+Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-* 3.7.3 :  [http://www.pgpool.net/docs/latest/en/html/release-3-7-3.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7-3.html Japanese]
+* 4.5.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-3.html Japanese]
-* 3.6.10 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-10.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-10.html Japanese]
+* 4.4.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-8.html Japanese]
-* 3.5.14 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-14.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-14.html Japanese]
+* 4.3.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-11.html Japanese]
-* 3.4.17:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-17.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-17.html Japanese]
+* 4.2.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-18.html Japanese]
-* 3.3.21:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-21.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-21.html Japanese]
+* 4.1.21 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-21.html Japanese]
-=== Pgpool-II 3.7.2-2 RPMs are released. (2018/03/14) ===
+=== Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released (2024/05/16) ===
-Pgpool-II 3.7.2-2 RPMs are released.
+Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-=== Pgpool-II 3.7.2, 3.6.9, 3.5.13, 3.4.16 and 3.3.20 officially released (2018/02/13) ===
+* 4.5.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-2.html Japanese]
+* 4.4.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-7.html Japanese]
+* 4.3.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-10.html Japanese]
+* 4.2.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-17.html Japanese]
+* 4.1.20 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-20.html Japanese]
-Pgpool-II 3.7.2, 3.6.9, 3.5.13, 3.4.16 and 3.3.20 officially released
+=== Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released (2024/02/29) ===
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released.
-* 3.7.2 :  [http://www.pgpool.net/docs/latest/en/html/release-3-7-2.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7-2.html Japanese]
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-* 3.6.9 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-9.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-9.html Japanese]
-* 3.5.13 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-13.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-13.html Japanese]
-* 3.4.16:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-16.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-16.html Japanese]
-* 3.3.20:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-20.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-20.html Japanese]
-=== pgpoolAdmin 3.7.1 officially released (2018/02/05) ===
+* 4.5.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-1.html Japanese]
+* 4.4.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-6.html Japanese]
+* 4.3.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-9.html Japanese]
+* 4.2.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-16.html Japanese]
+* 4.1.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-19.html Japanese]
-pgpoolAdmin 3.7.1 is officially released.
+=== Pgpool-II 4.5.0 released (2023/12/12) ===
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+Pgpool-II 4.5.0 is now released. This is the first stable release of Pgpool-II 4.5.x.
-[http://www.pgpool.net/docs/pgpoolAdmin/NEWS Release notes]
+V4.5 contains new features and enhancements, including:
-=== Pgpool-II 3.7.1, 3.6.8, 3.5.12, 3.4.15 and 3.3.19 officially released (2018/01/09) ===
+* Allow to use more kind of multiple statements in a query string.
-Pgpool-II 3.7.1, 3.6.8, 3.5.12, 3.4.15 and 3.3.19 officially released
+* Allow to load balance PREPARE/EXECUTE/DEALLOCATE.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Allow to set delay_threshold_by_time in milliseconds.
-* 3.7.1 :  [http://www.pgpool.net/docs/latest/en/html/release-3-7-1.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7-1.html Japanese]
+* Avoid session disconnection issue in failover/failback/backend error in some cases.
-* 3.6.8 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-8.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-8.html Japanese]
-* 3.5.12 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-12.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-12.html Japanese]
-* 3.4.15:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-15.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-15.html Japanese]
-* 3.3.19:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-19.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-19.html Japanese]
-=== Pgpool-II 3.7.0 and pgpoolAdmin 3.7.0 officially released (2017/11/22) ===
+* Allow to route queries to a specific backend node for a specific user connection.
-Pgpool-II 3.7.0 and pgpoolAdmin 3.7.0 are now relased.
+* Support multiple directories specification for pcp_socket_dir.
-V3.7 has new features:
+* Import PostgreSQL 16's SQL parser.
-* Quorum aware failover feature.
-* Allow specifying the hostnames in pool_hba.
-* Allow to specify per node health check parameters.
-* Support AWS Aurora.
-* Import PostgreSQL 10 SQL parser.
-* Support logical replication.
-* etc.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+You can download it from [https://www.pgpool.net/mediawiki/index.php/Downloads here].
 Release notes:
-[http://www.pgpool.net/docs/latest/en/html/release-3-7.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7.html Japanese]
+[https://www.pgpool.net/docs/45/en/html/release-4-5-0.html English]
+=== Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released (2023/11/30) ===
+Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released.
+Please note that 4.0.25 is the last release of the 4.0.x series.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+* 4.4.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-5.html Japanese]
+* 4.3.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-8.html Japanese]
+* 4.2.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-15.html Japanese]
+* 4.1.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-18.html Japanese]
+* 4.0.25 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-25.html Japanese]
+=== Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released (2023/08/17) ===
+Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+* 4.4.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-4.html Japanese]
+* 4.3.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-7.html Japanese]
+* 4.2.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-14.html Japanese]
+* 4.1.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-17.html Japanese]
+* 4.0.24 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-24.html Japanese]
+=== Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released (2023/05/18) ===
+Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+* 4.4.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-3.html Japanese]
+* 4.3.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-6.html Japanese]
+* 4.2.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-13.html Japanese]
+* 4.1.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-16.html Japanese]
+* 4.0.23 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-23.html Japanese]
+=== End-of-Life (EOL) Announcement for pgpoolAdmin (2023/02/17) ===
+Pgpool Global Development Group announces end-of-life date for pgpoolAdmin, which is the management tool for Pgpool-II.
+Pgpool Global Development Group will provide maintenance for pgpoolAdmin 4.0, 4.1 and 4.2 until December 31, 2023.
+After this date, bug fixes and security fixes for these versions will no longer be provided.
+In addition, pgpoolAdmin for Pgpool-II 4.3 or later will not be released.
+We would like to thank you for using pgpoolAdmin over the years.
+=== Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released (2023/01/23) ===
+Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released.
-=== Pgpool-II 3.6.7, 3.5.11, 3.4.14 and 3.3.18 officially released (2017/11/01) ===
+This release contains a security fix.
-Pgpool-II 3.6.7, 3.5.11, 3.4.14 and 3.3.18 officially released
+If following conditions are all met, the password of "wd_lifecheck_user" is exposed by "SHOW POOL STATUS" command.
+The command can be executed by any user who can connect to Pgpool-II. (CVE-2023-22332)
+* Version 3.3 or later
+* use_watchdog = on
+* wd_lifecheck_method = 'query'
+* A plain text password is set to wd_lifecheck_password
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+In this case it is strongly recommended to upgrade to this version (we do not expose wd_lifecheck_password in show pool_status command any more), or use one of following workarounds.
-* 3.6.7 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-7.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-7.html Japanese]
+Workarounds for 4.0.x to 4.4.x users:
-* 3.5.11 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-11.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-11.html Japanese]
+* Disable watchdog. Set use_watchdog to off.
-* 3.4.14:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-14.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-14.html Japanese]
+* Change wd_lifecheck_method to heartbeat.
-* 3.3.18:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-18.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-18.html Japanese]
+* Set an empty string to wd_lifecheck_password. This will use password in the pool_passwd file.
+* Set an AES encrypted password to wd_lifecheck_password.
-=== Pgpool-II 3.6.6, 3.5.10, 3.4.13, 3.3.17 and 3.2.22 officially released (2017/09/05) ===
+In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.
-Pgpool-II 3.6.6, 3.5.10, 3.4.13, 3.3.17, 3.2.22 and pgpoolAdmin 3.6.2 officially released
+Workarounds for 3.0.x to 3.7.x users:
+* Disable watchdog. Set use_watchdog to off.
+* Change wd_lifecheck_method to heartbeat.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.
-* 3.6.6 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-6.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-6.html Japanese]
+Please note that Pgpool-II 3.7.x or before are end of life and no minor updates are provided for those versions.
-* 3.5.10 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-10.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-10.html Japanese]
-* 3.4.13:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-13.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-13.html Japanese]
-* 3.3.17:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-17.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-17.html Japanese]
-* 3.2.22:  [http://www.pgpool.net/docs/latest/en/html/release-3-2-22.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-22.html Japanese]
-=== Pgpool-II 3.6.5, 3.5.9, 3.4.12, 3.3.16 and 3.2.21 officially released (2017/07/11) ===
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-Pgpool-II 3.6.5, 3.5.9, 3.4.12, 3.3.16 and 3.2.21 officially released
+* 4.4.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-2.html Japanese]
+* 4.3.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-5.html Japanese]
+* 4.2.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-12.html Japanese]
+* 4.1.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-15.html Japanese]
+* 4.0.22 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-22.html Japanese]
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released (2022/12/22) ===
-* 3.6.5 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-5.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-5.html Japanese]
+Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released.
-* 3.5.9 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-9.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-9.html Japanese]
-* 3.4.12:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-12.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-12.html Japanese]
-* 3.3.16:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-16.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-16.html Japanese]
-* 3.2.21:  [http://www.pgpool.net/docs/latest/en/html/release-3-2-21.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-21.html Japanese]
-=== Pgpool-II 3.6.4, 3.5.8 officially released (2017/05/11) ===
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-Pgpool-II 3.6.4, 3.5.8 officially released
+* 4.4.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-1.html Japanese]
+* 4.3.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-4.html Japanese]
+* 4.2.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-11.html Japanese]
+* 4.1.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-14.html Japanese]
+* 4.0.21 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-21.html Japanese]
+* 3.7.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-26.html Japanese]
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.4.0 released (2022/12/06) ===
-* 3.6.4:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-4.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-4.html Japanese]
+Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.
-* 3.5.8:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-8.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-8.html Japanese]
-=== Pgpool-II 3.6.3, 3.5.7, 3.4.11, 3.3.15, 3.2.20 and pgpoolAdmin 3.6.1 officially released (2017/04/28) ===
+V4.4 contains new features and enhancements, including:
-Pgpool-II 3.6.3, 3.5.7, 3.4.11, 3.3.15, 3.2.20 and pgpoolAdmin 3.6.1 officially released
+* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
-* 3.6.3:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-3.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-3.html Japanese]
+* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
-* 3.5.7:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-7.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-7.html Japanese]
-* 3.4.11:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-11.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-11.html Japanese]
-* 3.3.15:  [http://www.pgpool.net/docs/latest/ja/html/release-3-3-15.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-15.html Japanese]
-* 3.2.20:  [http://www.pgpool.net/docs/latest/ja/html/release-3-2-20.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-20.html Japanese]
-=== Pgpool-II 3.6.2, 3.5.6, 3.4.10, 3.3.14 and 3.2.19 officially released (2017/03/17) ===
+* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
-Pgpool-II 3.6.2, 3.5.6, 3.4.10, 3.3.14 and 3.2.19 officially released
+* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Import PostgreSQL 15's SQL parser.
-* 3.6.2:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-2.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-2.html Japanese]
+* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.
-* 3.5.6:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-6.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-6.html Japanese]
-* 3.4.10:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-10.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-10.html Japanese]
-* 3.3.14:  [http://www.pgpool.net/docs/latest/ja/html/release-3-3-14.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-14.html Japanese]
-* 3.2.19:  [http://www.pgpool.net/docs/latest/ja/html/release-3-2-19.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-19.html Japanese]
-=== pgpoolAdmin 3.6.0 officially released (2017/02/28) ===
+You can download it from [https://www.pgpool.net/mediawiki/index.php/Downloads here].
-pgpoolAdmin 3.6.0 is officially released.
+Release notes:
+[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English] [https://www.pgpool.net/docs/44/ja/html/release-4-4-0.html Japanese]
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18) ===
-=== pgpool-II 3.6.1, 3.5.5, 3.4.9, 3.3.13, 3.2.18 and 3.1.21 officially released (2016/12/26) ===
+Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released.
-These are the latest stable versions of each major branches.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* 4.3.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-3.html Japanese]
+* 4.2.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-10.html Japanese]
+* 4.1.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-13.html Japanese]
+* 4.0.20 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-20.html Japanese]
+* 3.7.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-25.html Japanese]
-* 3.6.1:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-1.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-1.html Japanese]
+=== Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19) ===
-* 3.5.5:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-5.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-5.html Japanese]
-* 3.4.9:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-9.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-9.html Japanese]
-* 3.3.13:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-13.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-13.html Japanese]
-* 3.2.18:  [http://www.pgpool.net/docs/latest/en/html/release-3-2-18.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-18.html Japanese]
-* 3.1.21:  [http://www.pgpool.net/docs/latest/en/html/release-3-1-21.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-1-21.html Japanese]
-pgpool-II 3.1.21 is the final release of the 3.1.x. This series has reached "End of Life", and is no longer maintained and does not receive any updates.
+Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released.
-=== pgpool-II 3.6.0 officially released (2016/11/21) ===
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-Pgpool-II 3.6.0 is now officially released.
+* 4.3.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-2.html Japanese]
+* 4.2.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-9.html Japanese]
+* 4.1.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-12.html Japanese]
+* 4.0.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-19.html Japanese]
+* 3.7.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-24.html Japanese]
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17) ===
-V3.6's new features are:
+Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released.
-* Improve the behavior of fail-over.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-* New PGPOOL SET command has been introduced.
-* Watchdog is significantly enhanced.
-* Handling of extended query protocol (e.g. used by Java applications) in streaming replication mode speeds up if many rows are returned in a result set.
-* Import parser of PostgreSQL 9.6.
-* In some cases pg_terminate_backend() now does not trigger a fail-over.
-* Change documentation format from raw HTML to SGML.
-* etc.
-=== pgpool-II 3.5.4, 3.4.8, 3.3.12, 3.2.17 and 3.1.20 officially released (2016/08/31) ===
+* 4.3.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-1.html Japanese]
+* 4.2.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-8.html Japanese]
+* 4.1.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-11.html Japanese]
+* 4.0.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-18.html Japanese]
+* 3.7.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-23.html Japanese]
-These are the latest stable versions of each major branches.
+=== Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23) ===
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released.
-* 3.5.4:  [http://www.pgpool.net/docs/pgpool-II-3.5.4/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.4/doc/pgpool-ja.html#release3.5.4 Japanese]
+The purpose of this release is to provide packages for PostgreSQL 14.
-* 3.4.8:  [http://www.pgpool.net/docs/pgpool-II-3.4.8/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.8/doc/pgpool-ja.html#release3.4.8 Japanese]
-* 3.3.12:  [http://www.pgpool.net/docs/pgpool-II-3.3.12/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.12/doc/pgpool-ja.html#release3.3.12 Japanese]
-* 3.2.17:  [http://www.pgpool.net/docs/pgpool-II-3.2.17/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.17/doc/pgpool-ja.html#release3.2.17 Japanese]
-* 3.1.20: [http://www.pgpool.net/docs/pgpool-II-3.1.20/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.20/doc/pgpool-ja.html#release3.1.20 Japanese]
-=== pgpool-II 3.5.3, 3.4.7, 3.3.11, 3.2.16, 3.1.19, and pgpoolAdmin 3.5.3 officially released (2016/06/17) ===
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-These are the latest stable versions of each major branches.
+* 4.2.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-7.html Japanese]
+* 4.1.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-10.html Japanese]
+* 4.0.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-17.html Japanese]
+* 3.7.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-22.html Japanese]
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.3.0 released (2021/12/07) ===
-* 3.5.3:  [http://www.pgpool.net/docs/pgpool-II-3.5.3/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.3/doc/pgpool-ja.html#release3.5.3 Japanese]
+Pgpool-II 4.3.0 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3-0.html 4.3.0]
-* 3.4.7:  [http://www.pgpool.net/docs/pgpool-II-3.4.7/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.7/doc/pgpool-ja.html#release3.4.7 Japanese]
-* 3.3.11:  [http://www.pgpool.net/docs/pgpool-II-3.3.11/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.11/doc/pgpool-ja.html#release3.3.11 Japanese]
-* 3.2.16:  [http://www.pgpool.net/docs/pgpool-II-3.2.16/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.16/doc/pgpool-ja.html#release3.2.16 Japanese]
-* 3.1.19: [http://www.pgpool.net/docs/pgpool-II-3.1.19/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.19/doc/pgpool-ja.html#release3.1.19 Japanese]
-=== pgpool-II 3.5.2, 3.4.6, 3.3.10, 3.2.15, 3.1.18, and pgpoolAdmin 3.5.2 officially released (2016/04/26) ===
+V4.3.0 contains new features and enhancements, including:
+* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
-These are the latest stable versions of each major branches.
+* Allow to choose the least replication delay standby node when selecting the load balance node.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Allow to specify the node id to be promoted in pcp_promote_node.
-* 3.5.2:  [http://www.pgpool.net/docs/pgpool-II-3.5.2/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.2/doc/pgpool-ja.html#release3.5.2 Japanese]
+* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
-* 3.4.6:  [http://www.pgpool.net/docs/pgpool-II-3.4.6/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.6/doc/pgpool-ja.html#release3.4.6 Japanese]
-* 3.3.10:  [http://www.pgpool.net/docs/pgpool-II-3.3.10/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.10/doc/pgpool-ja.html#release3.3.10 Japanese]
-* 3.2.15:  [http://www.pgpool.net/docs/pgpool-II-3.2.15/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.15/doc/pgpool-ja.html#release3.2.15 Japanese]
-* 3.1.18: [http://www.pgpool.net/docs/pgpool-II-3.1.18/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.18/doc/pgpool-ja.html#release3.1.18 Japanese]
-=== pgpool-II 3.5.1, 3.4.5, 3.3.9, 3.2.14, 3.1.17, and pgpoolAdmin 3.5.1 officially released (2016/04/04) ===
+* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
-These are the latest stable versions of each major branches.
+* Allow pcp_node_info to list all backend nodes information.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
-* 3.5.1:  [http://www.pgpool.net/docs/pgpool-II-3.5.1/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.1/doc/pgpool-ja.html#release3.5.1 Japanese]
+* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
-* 3.4.5:  [http://www.pgpool.net/docs/pgpool-II-3.4.5/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.5/doc/pgpool-ja.html#release3.4.5 Japanese]
-* 3.3.9:  [http://www.pgpool.net/docs/pgpool-II-3.3.9/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.9/doc/pgpool-ja.html#release3.3.9 Japanese]
-* 3.2.14:  [http://www.pgpool.net/docs/pgpool-II-3.2.14/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.14/doc/pgpool-ja.html#release3.2.14 Japanese]
-* 3.1.17: [http://www.pgpool.net/docs/pgpool-II-3.1.17/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.17/doc/pgpool-ja.html#release3.1.17 Japanese]
-=== pgpool-II 3.4.4, 3.3.8, 3.2.13, 3.1.16, and 3.0.20 officially released (2016/02/05) ===
+* Add support for log time stamp with milliseconds.
-These are the latest stable versions of each major branches.
+* Import PostgreSQL 14's SQL parser.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
-* 3.4.4:  [http://www.pgpool.net/docs/pgpool-II-3.4.4/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.4/doc/pgpool-ja.html#release3.4.4 Japanese]
+* pgpool.conf sample files are unified into single sample file for easier configuration.
-* 3.3.8:  [http://www.pgpool.net/docs/pgpool-II-3.3.8/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.8/doc/pgpool-ja.html#release3.3.8 Japanese]
-* 3.2.13:  [http://www.pgpool.net/docs/pgpool-II-3.2.13/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.13/doc/pgpool-ja.html#release3.2.13 Japanese]
-* 3.1.16: [http://www.pgpool.net/docs/pgpool-II-3.1.16/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.16/doc/pgpool-ja.html#release3.1.16 Japanese]
-* 3.0.20: [http://www.pgpool.net/docs/pgpool-II-3.0.20/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.20/doc/pgpool-ja.html#release3.0.20 Japanese]
-pgpool-II 3.0.20 is the final release of the 3.0.x. This series has reached "End of Life", and is no longer maintained and does not receive any updates.
+* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
-=== pgpool-II 3.5.0 and pgpoolAdmin 3.5.0 officially released (2016/01/29) ===
+You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+Release notes:
+[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
-Pgpool-II 3.5.0 and pgpoolAdmin 3.5.0 are now officially released.
+=== Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18) ===
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-V3.5's new features are:
+* 4.2.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-6.html Japanese]
+* 4.1.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-9.html Japanese]
+* 4.0.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-16.html Japanese]
+* 3.7.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-21.html Japanese]
+* 3.6.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-28.html Japanese]
-* Improved performance in extended query protocol
+=== Pgpool-II 4.2.5 released (2021/09/14) ===
-* Overcoming the thundering herd problem
-* watchdog feature enhancements to be more robust and adaptable
-* PCP command enhancements
-* Import PostgreSQL 9.5 parser
-* etc.
-Please see [http://pgpool.net/mediawiki/index.php?title=pgpool-II_3.5_features&redirect=no this] for details.
+Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-.5.0 release note:  [http://www.pgpool.net/docs/pgpool-II-3.5.0/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.0/doc/pgpool-ja.html#release3.5.0 Japanese]
+* 4.2.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-5.html Japanese]
-=== pgpool-II 3.4.3, 3.3.7, 3.2.12, 3.1.15, and 3.0.19 officially released (2015/07/24) ===
+=== Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05) ===
-These are the latest stable versions of each major branches.
+Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-* 3.4.3:  [http://www.pgpool.net/docs/pgpool-II-3.4.3/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.3/doc/pgpool-ja.html#release3.4.3 Japanese]
+* 4.2.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-4.html Japanese]
-* 3.3.7:  [http://www.pgpool.net/docs/pgpool-II-3.3.7/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.7/doc/pgpool-ja.html#release3.3.7 Japanese]
+* 4.1.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-8.html Japanese]
-* 3.2.12:  [http://www.pgpool.net/docs/pgpool-II-3.2.12/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.12/doc/pgpool-ja.html#release3.2.12 Japanese]
+* 4.0.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-15.html Japanese]
-* 3.1.15: [http://www.pgpool.net/docs/pgpool-II-3.1.15/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.15/doc/pgpool-ja.html#release3.1.15 Japanese]
+* 3.7.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-20.html Japanese]
-* 3.0.19: [http://www.pgpool.net/docs/pgpool-II-3.0.19/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.19/doc/pgpool-ja.html#release3.0.19 Japanese]
+* 3.6.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-27.html Japanese]
+=== pgpoolAdmin 4.2.0 officially released (2021/06/17) ===
-=== pgpool-II 3.4.2, 3.3.6, 3.2.11, 3.1.14, and 3.0.18 officially released (2015/04/08) ===
+pgpoolAdmin 4.2.0 officially released.
-These are the latest stable versions of each major branches.
+pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2.
+Please take a look at [https://www.pgpool.net/docs/pgpoolAdmin/NEWS release notes].
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-* 3.4.2:  [http://www.pgpool.net/docs/pgpool-II-3.4.2/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.2/doc/pgpool-ja.html#release3.4.2 Japanese]
+=== Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20) ===
-* 3.3.6:  [http://www.pgpool.net/docs/pgpool-II-3.3.6/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.6/doc/pgpool-ja.html#release3.3.6 Japanese]
-* 3.2.11:  [http://www.pgpool.net/docs/pgpool-II-3.2.11/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.11/doc/pgpool-ja.html#release3.2.11 Japanese]
-* 3.1.14: [http://www.pgpool.net/docs/pgpool-II-3.1.14/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.14/doc/pgpool-ja.html#release3.1.14 Japanese]
-* 3.0.18: [http://www.pgpool.net/docs/pgpool-II-3.0.18/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.18/doc/pgpool-ja.html#release3.0.18 Japanese]
-=== pgpool-II 3.4.1, 3.3.5, 3.2.10, 3.1.13, 3.0.17  and pgpoolAdmin 3.4.1 officially released (2015/02/05) ===
+Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.
-These are the latest stable versions of each major branches.
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* 4.2.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-3.html Japanese]
+* 4.1.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-7.html Japanese]
+* 4.0.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-14.html Japanese]
+* 3.7.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-19.html Japanese]
+* 3.6.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-26.html Japanese]
-* 3.4.1:  [http://www.pgpool.net/docs/pgpool-II-3.4.1/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.1/doc/pgpool-ja.html#release3.4.1 Japanese]
+=== Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18) ===
-* 3.3.5:  [http://www.pgpool.net/docs/pgpool-II-3.3.5/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.5/doc/pgpool-ja.html#release3.3.5 Japanese]
-* 3.2.10:  [http://www.pgpool.net/docs/pgpool-II-3.2.10/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.10/doc/pgpool-ja.html#release3.2.10 Japanese]
-* 3.1.13: [http://www.pgpool.net/docs/pgpool-II-3.1.13/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.13/doc/pgpool-ja.html#release3.1.13 Japanese]
-* 3.0.17: [http://www.pgpool.net/docs/pgpool-II-3.0.17/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.17/doc/pgpool-ja.html#release3.0.17 Japanese]
-* pgpoolAdmin 3.4.1: [http://www.pgpool.net/docs/pgpoolAdmin-3.4.1/NEWS.txt English]
+Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.
-=== The pgpool-II official yum repository released (2014/12/16) ===
+You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
-PgPool Global Development Group announced the pgpool-II official yum repository.
+* 4.2.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-2.html Japanese]
-With this repository, you will be able to install or update pgpool-II and pgpoolAdmin etc. by using yum.
+* 4.1.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-6.html Japanese]
+* 4.0.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-13.html Japanese]
+* 3.7.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-18.html Japanese]
+* 3.6.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-25.html Japanese]
-http://www.pgpool.net/yum/
+=== Pgpool-II 4.2.1 released (2020/12/23) ===
-The yum repository currently supports pgpool-II 3.3 or above with RHEL6 x86_64.
+Pgpool-II 4.2.1 is now released.
-See [[Yum Repository]] for detail.
+You can download them from [https://pgpool.net/mediawiki/index.php/Downloads here].
-=== pgpool-II 3.4.0 and pgpoolAdmin 3.4.0 officially released (2014/11/07) ===
+* 4.2.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-1.html Japanese]
-Pgpool-II 3.4.0 is now officially released.
+=== Pgpool-II 4.2.0 released (2020/11/26) ===
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+Pgpool-II 4.2.0 is now released.
+V4.2 contains new features and enhancements, including:
-V3.4's new features are:
+* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
-* Allow fine control of load balancing by using application name or database name
+* Implement logging_collector for easier log management.
-* New features about log output
-** Allow to print pgpool-II process names
-**  Allow to control log verbosity like PostgreSQL
-* SQL parser compatible with PostgreSQL 9.4
-* Import PostgreSQL's memory manager and exception manager
-* Support IPv6 address
-* Reorganize source code tree
-* etc.
+* Implement log_disconnections to collect disconnection logs.
-* 3.4.0 release note:  [http://www.pgpool.net/docs/pgpool-II-3.4.0/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.0/doc/pgpool-ja.html#release3.4.0 Japanese]
+* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
-=== pgpool-II 3.3.4, 3.2.9, 3.1.12, and 3.0.16 are officially released (2014/09/05) ===
+* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
-These are the latest stable versions of each major branches.
+* New PCP command pcp_reload_config is added.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
-* 3.3.4:  [http://www.pgpool.net/docs/pgpool-II-3.3.4/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.4/doc/pgpool-ja.html#release3.3.4 Japanese]
+* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
-* 3.2.9:  [http://www.pgpool.net/docs/pgpool-II-3.2.9/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.9/doc/pgpool-ja.html#release3.2.9 Japanese]
-* 3.1.12: [http://www.pgpool.net/docs/pgpool-II-3.1.12/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.12/doc/pgpool-ja.html#release3.1.12 Japanese]
-* 3.0.16: [http://www.pgpool.net/docs/pgpool-II-3.0.16/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.16/doc/pgpool-ja.html#release3.0.16 Japanese]
-=== pgpool-ha 2.2 released (2014/04/01) ===
+* Support LDAP authentication between clients and Pgpool-II.
-This is the latest stable version.
+* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads#pgpool-HA here].
+* Import PostgreSQL 13's SQL parser.
+You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
-=== pgpool-II 3.3.3, 3.2.8, 3.1.11, 3.0.15  and pgpoolAdmin 3.3.1 officially released (2014/03/24) ===
+Release notes:
+[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
-These are the latest stable versions of each major branches.
+== Development ==
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+=== Pgpool-II 4.6 RC1 released (2025/02/20) ===
-* 3.3.3:  [http://www.pgpool.net/docs/pgpool-II-3.3.3/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.3/doc/pgpool-ja.html#release3.3.3 Japanese]
+Pgpool-II 4.6 RC1 is now released.
-* 3.2.8:  [http://www.pgpool.net/docs/pgpool-II-3.2.8/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.8/doc/pgpool-ja.html#release3.2.8 Japanese]
-* 3.1.11: [http://www.pgpool.net/docs/pgpool-II-3.1.11/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.11/doc/pgpool-ja.html#release3.1.11 Japanese]
-* 3.0.15: [http://www.pgpool.net/docs/pgpool-II-3.0.15/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.15/doc/pgpool-ja.html#release3.0.15 Japanese]
-* pgpoolAdmin 3.3.1: [http://www.pgpool.net/docs/pgpoolAdmin-3.3.1/NEWS.txt English]
+Note that this is not a stable version but just for developers.
-=== pgpool-II 3.2.7, 3.1.10, 3.0.14 officially released (2013/12/06) ===
+V4.6 contains new features and enhancements, including:
-These are the latest stable versions of each major branches.
+* New PCP command to trigger log rotation.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Allow logging_collector related parameters to be changed by reloading.
-* 3.2.7:  [http://www.pgpool.net/docs/pgpool-II-3.2.7/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.7/doc/pgpool-ja.html#release3.2.7 Japanese]
+* New PCP command to invalidate query cache.
-* 3.1.10: [http://www.pgpool.net/docs/pgpool-II-3.1.10/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.10/doc/pgpool-ja.html#release3.1.10 Japanese]
-* 3.0.14: [http://www.pgpool.net/docs/pgpool-II-3.0.14/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.14/doc/pgpool-ja.html#release3.0.14 Japanese]
-=== pgpool-II 3.3.2 officially released (2013/11/29) ===
+* Allow to force to create query cache
-These are the latest stable version of 3.3.
+* New PGPOOL SET CACHE DELETE command.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* New configuration parameter log_backend_messages.
-* 3.3.2: [http://www.pgpool.net/docs/pgpool-II-3.3.2/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.2/doc/pgpool-ja.html#release3.0.7 Japanese]
+* Import PostgreSQL 17's SQL parser.
-=== pgpool-II 3.3.1, 3.2.6, 3.1.9, 3.0.13 officially released (2013/09/06) ===
+* Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.
-These are the latest stable versions of each major branches.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+Release notes:
+[https://www.pgpool.net/docs/46/en/html/release-4-6-0.html English]
-=== Missing regression test suite in pgpool-II 3.3.0.tar.gz (2013/07/31) ===
+=== Pgpool-II 4.6 beta1 released (2025/02/13) ===
-New regression test suite was not accidentally included in the pgpool-II 3.3.0.tar.gz tar ball.
+Pgpool-II 4.6 beta1 is now released.
-You can get it from git repository or download from
-[http://www.pgpool.net/download.php?f=regression-3.3.0.tar.gz here].
-=== pgpool-II 3.3 and pgpoolAdmin 3.3 officially released (2013/07/30) ===
+Note that this is not a stable version but just for developers.
-Pgpool-II 3.3 is now officially released.
+V4.6 contains new features and enhancements, including:
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* New PCP command to trigger log rotation.
-V3.3's new features are:
+* Allow logging_collector related parameters to be changed by reloading.
-* Enhancements for watchdog
+* New PCP command to invalidate query cache.
-** New monitoring method of watchdog lifecheck using heartbeat signal
-** Interlocking of failover/failback script
-** Secure watchdog communication
-** PCP command for retrieving the watchdog status
-** etc.
-* Othres
-** Import PostgreSQL 9.2 raw parser
-** New pgpool_setup tool
-** Support for using CREATE EXTENSION to install pgpool specific extensions
-** regression test suit
-** etc.
-* [http://www.pgpool.net/docs/pgpool-II-3.3.0/NEWS.txt pgpool-II 3.3 release note (English)]
+* Allow to force to create query cache
-* [http://www.pgpool.net/docs/pgpool-II-3.3.0/pgpool-ja.html#release3.3.0 pgpool-II 3.3 release note (Japanese)]
-=== pgpool-II 3.2.5, 3.1.8, 3.0.12 officially released (2013/07/10) ===
+* New PGPOOL SET CACHE DELETE command.
-These are the latest stable versions of each major branches.
+* New configuration parameter log_backend_messages.
-You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+* Import PostgreSQL 17's SQL parser.
-== Development ==
+* Add IPv6 support for watchdog hostname and heartbeat_hostname parameter.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
+Release notes:
+[https://www.pgpool.net/docs/46/en/html/release-4-6-0.html English]
+=== Pgpool-II 4.5 RC1 released (2023/11/28) ===
+Pgpool-II 4.5 RC1 is now released.
+Note that this is not a stable version but just for developers.
+V4.5 contains new features and enhancements, including:
+* Allow to use multiple statements in a query string.
-=== Pgpool-II 4.0 RC1 released (2018/10/03) ===
+* Allow to set delay_threshold_by_time in milliseconds.
-Pgpool-II 4.0 RC1 is now relased.
+* Avoid session disconnection issue in failover/failback/backend error in some cases.
-This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.
+* Allow to route queries to a specific backend node for a specific user connection.
-V4.0 has new features:
+* Support multiple directories specification for pcp_socket_dir.
-* Add SCRAM and Certificate authentication support.
+* Import PostgreSQL 16's SQL parser.
-* Detecting "false" primary server of PostgreSQL.
-* Improvements to load balancing:
-** More load balancing fine control after write queries.
-** Load balancing control for specific queries.
-** Allow to specify load balance weight ratio for load balance parameters.
-* Add last state change timestamp to SHOW POOL NODES.
-* Import PostgreSQL 11 SQL parser.
-* Logging client messages.
-* etc.
 You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 Release notes:
-[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
+[https://www.pgpool.net/docs/45/en/html/release-4-5-0.html English]
+=== Pgpool-II 4.5 beta1 released (2023/11/14) ===
+Pgpool-II 4.5 beta1 is now released.
+Note that this is not a stable version but just for developers.
+V4.5 contains new features and enhancements, including:
+* Allow to use multiple statements in a query string.
-=== Pgpool-II 4.0 beta1 released (2018/09/19) ===
+* Allow to set delay_threshold_by_time in milliseconds.
-Pgpool-II 4.0 beta1 is now relased.
+* Avoid session disconnection issue in failover/failback/backend error in some cases.
-This is not a stable version but just for developers.
+* Allow to route queries to a specific backend node for a specific user connection.
-V4.0 has new features:
+* Support multiple directories specification for pcp_socket_dir.
-* Add SCRAM and Certificate authentication support.
+* Import PostgreSQL 16's SQL parser.
-* Detecting "false" primary server of PostgreSQL.
-* Improvements to load balancing:
-** More load balancing fine control after write queries.
-** Load balancing control for specific queries.
-** Allow to specify load balance weight ratio for load balance parameters.
-* Add last state change timestamp to SHOW POOL NODES.
-* Import PostgreSQL 11 SQL parser.
-* Logging client messages.
-* etc.
 You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 Release notes:
-[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
+[https://www.pgpool.net/docs/45/en/html/release-4-5-0.html English]
+=== Pgpool-II 4.4 RC1 released (2022/11/22) ===
+Pgpool-II 4.4 RC1 is now released.
+Note that this is not a stable version but just for developers.
+V4.4 contains new features and enhancements, including:
+* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
+* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
-=== Pgpool-II 4.0 alpha2 released (2018/09/06) ===
+* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
-Pgpool-II 4.0 alpha2 is now relased.
+* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
-This is not a stable version but just for developers.
+* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
-V4.0 has new features:
+* Import PostgreSQL 15's SQL parser.
-* Add SCRAM and Certificate authentication support.
+* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.
-* Detecting "false" primary server of PostgreSQL.
-* Improvements to load balancing:
-** More load balancing fine control after write queries.
-** Load balancing control for specific queries.
-** Allow to specify load balance weight ratio for load balance parameters.
-* Add last state change timestamp to SHOW POOL NODES.
-* Import PostgreSQL 11 SQL parser.
-* Logging client messages.
-* etc.
 You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 Release notes:
-[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
+[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English]
+=== Pgpool-II 4.4 beta1 released (2022/11/14) ===
+Pgpool-II 4.4 beta1 is now released.
+Note that this is not a stable version but just for developers.
+V4.4 contains new features and enhancements, including:
+* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
-=== Pgpool-II 4.0 alpha1 released (2018/08/20) ===
+* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
-Pgpool-II 4.0 alpha1 is now relased.
+* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
-This is not a stable version but just for developers.
+* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
-V4.0 has new features:
+* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
-* Add SCRAM and Certificate authentication support.
+* Import PostgreSQL 15's SQL parser.
-* Detecting "false" primary server of PostgreSQL.
-* Improvements to load balancing:
-** More load balancing fine control after write queries.
-** Load balancing control for specific queries.
-** Allow to specify load balance weight ratio for load balance parameters.
-* Add last state change timestamp to SHOW POOL NODES.
-*Logging client messages.
-* etc.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 Release notes:
-[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
+[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English]
+=== Pgpool-II 4.3 RC1 released (2021/11/25) ===
+Pgpool-II 4.3 RC1 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3rc1.html 4.3 RC1]
+Note that this is not a stable version but just for developers.
+V4.3 contains new features and enhancements, including:
+* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
+* Allow to choose the least replication delay standby node when selecting the load balance node.
+* Allow to specify the node id to be promoted in pcp_promote_node.
+* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
+* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
-=== Pgpool-II 3.7 RC1 and pgpoolAdmin 3.7 RC1 released (2017/11/13) ===
+* Allow pcp_node_info to list all backend nodes information.
-Pgpool-II 3.7 RC1 and pgpoolAdmin 3.7 RC1 are now relased.
+* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
-This is not intended to be used in production but is close to the
+* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
-release version. So users are encouraged to test it out.
-V3.7 has new features:
+* Add support for log time stamp with milliseconds.
-* Quorum aware failover feature.
-* Allow specifying the hostnames in pool_hba.
-* Allow to specify per node health check parameters.
-* Support AWS Aurora.
-* Import PostgreSQL 10 SQL parser.
-* Support logical replication.
-* etc.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Import PostgreSQL 14's SQL parser.
+* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
+* pgpool.conf sample files are unified into single sample file for easier configuration.
+* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 Release notes:
-[http://www.pgpool.net/docs/pgpool-II-3.7.0/doc/en/html/release-3-7.html English] [http://www.pgpool.net/docs/pgpool-II-3.7.0/doc/ja/html/release-3-7.html Japanese]
+[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
+=== Pgpool-II 4.3 beta2 released (2021/11/18) ===
+Pgpool-II 4.3 beta2 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3beta2.html 4.3 beta2]
+Note that this is not a stable version but just for developers.
+V4.3 contains new features and enhancements, including:
+* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
+* Allow to choose the least replication delay standby node when selecting the load balance node.
+* Allow to specify the node id to be promoted in pcp_promote_node.
+* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
+* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
+* Allow pcp_node_info to list all backend nodes information.
+* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
-=== Pgpool-II 3.7 beta1 released (2017/10/17) ===
+* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
-Pgpool-II 3.7 beta1 is now relased. This is not a stable version but just for developers.
+* Add support for log time stamp with milliseconds.
-V3.7 has new features:
+* Import PostgreSQL 14's SQL parser.
-* Quorum aware failover feature.
-* Allow specifying the hostnames in pool_hba.
-* Allow to specify per node health check parameters.
-* Support AWS Aurora.
-* Import PostgreSQL 10 SQL parser.
-* Support logical replication.
-* etc.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
+* pgpool.conf sample files are unified into single sample file for easier configuration.
+* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
-=== pgpool-II 3.6 RC1 released (2016/11/16) ===
+Release notes:
+[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
-pgpool-II 3.6 RC1 is now relased. This is not a stable version but just for developers.
+=== Pgpool-II 4.3 beta1 released (2021/11/09) ===
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+Pgpool-II 4.3 beta1 is now released.
-=== pgpool-II 3.6 beta2 released (2016/11/08) ===
+Note that this is not a stable version but just for developers.
-pgpool-II 3.6 beta2 is now relased. This is not a stable version but just for developers.
+V4.3 contains new features and enhancements, including:
+* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
-Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.6 better!
+* Allow to choose the least replication delay standby node when selecting the load balance node.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Allow to specify the node id to be promoted in pcp_promote_node.
-=== pgpool-II 3.6 beta1 released (2016/11/02) ===
+* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
-pgpool-II 3.6 beta1 is now relased. This is not a stable version but just for developers.
+* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
-Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.6 better!
+* Allow pcp_node_info to list all backend nodes information.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
-=== Pgpool-II 3.6 alpha1 released (2016/10/19) ===
+* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
-Pgpool-II 3.6 alpha1 is now relased. This is not a stable version but just for developers.
+* Add support for log time stamp with milliseconds.
-V3.6 has a new feature:
+* Import PostgreSQL 14's SQL parser.
-* Improve the behavior of fail-over.
-* New PGPOOL SET command has been introduced.
-* Watchdog is significantly enhanced.
-* Handling of extended query protocol (e.g. used by Java applications) in streaming replication mode speeds up if many rows are returned in a result set.
-* Import parser of PostgreSQL 9.6.
-* In some cases pg_terminate_backend() now does not trigger a fail-over.
-* Change documentation format from raw HTML to SGML.
-* etc.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
-=== pgpool-II 3.5 RC1 released (2016/1/14) ===
+* pgpool.conf sample files are unified into single sample file for easier configuration.
-pgpool-II 3.5 RC1 and pgpoolAdmin 3.5 RC1 are now relased. This is not a stable version but just for developers.
+* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
-=== pgpool-II 3.5 beta1 released (2015/12/14) ===
+Release notes:
+[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
-pgpool-II 3.5 beta1 and pgpoolAdmin 3.5 beta1 are now relased. This is not a stable version but just for developers.
+=== Pgpool-II 4.2 beta1 released (2020/10/27) ===
-Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.5 better!
+Pgpool-II 4.2 beta1 is now released.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+Note that this is not a stable version but just for developers.
-=== pgpool-II 3.5 alpha1 released (2015/11/16) ===
+V4.2 contains new features and enhancements, including:
-Pgpool-II 3.5 alpha1 is now relased. This is not a stable version but just for developers.
+* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
-V3.5 has a new feature:
+* Implement logging_collector for easier log management.
-* Improved performance in extended query protocol
-* Overcoming the thundering herd problem
-* watchdog feature enhancements to be more robust and adaptable
-* PCP command enhancements
-* Import PostgreSQL 9.5 parser
-* etc.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Implement log_disconnections to collect disconnection logs.
-=== pgpool-II 3.3 RC1 released (2013/07/25) ===
+* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
-Pgpool-II 3.3 RC1 is now relased. This is not a stable version but just for developers.
+* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* New PCP command pcp_reload_config is added.
-=== pgpool-II 3.3 beta1 released (2013/06/12) ===
+* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
-Pgpool-II 3.3 beta1 is now relased. This is not a stable version but just for developers.
+* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
-Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.3 better!
+* Support LDAP authentication between clients and Pgpool-II.
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
-=== pgpool-II 3.3 alpha1 released (2013/05/17) ===
+* Import PostgreSQL 13's SQL parser.
-Pgpool-II 3.3 alpha1 is now relased. This is not a stable version but just for developers.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
-V3.3 has a new feature:
+Release notes:
-* Enhancements for watchdog
+[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
-** New monitoring method of watchdog lifecheck using heartbeat signal
-** Interlocking of failover/failback script
+=== Pgpool-II 4.2 alpha1 released (2020/10/06) ===
-** Secure watchdog communication
-** etc.
+Pgpool-II 4.2 alpha1 is now released.
-* Othres
-** Import PostgreSQL 9.2 raw parser
+Note that this is not a stable version but just for developers.
-** New pgpool_setup tool
-** Support for using CREATE EXTENSION to install pgpool specific extensions
+V4.2 contains new features and enhancements, including:
-You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
+* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
+* Implement logging_collector for easier log management.
+* Implement log_disconnections to collect disconnection logs.
+* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
+* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
+* New PCP command pcp_reload_config is added.
+* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
+* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
+* Support LDAP authentication between clients and Pgpool-II.
+* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
+* Import PostgreSQL 13's SQL parser.
+You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
+Release notes:
+[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
 == Old ==
 See [[Old news|this page]].
-= Where can I get commercial support for pgpool-II? =
+= Where can I get commercial support for Pgpool-II? =
-Some commercial packages include pgpool-II support. Consulting and annual support can be purchased from SRA OSS, Inc. Japan (http://www.sraoss.co.jp/index_en.php).
+Some commercial packages include Pgpool-II support. Consulting and annual support can be purchased from SRA OSS LLC (https://www.sraoss.co.jp/index_en.php).

Difference between revisions of "Main Page"

Latest revision as of 01:19, 28 February 2025

Contents

Welcome to Pgpool Wiki!

What is Pgpool-II?

Pgpool-II License

Stable versions

Contacts

What's new

News

Pgpool-II 4.6.0 officially released (2025/02/28)

Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released (2025/02/28)

Events

PGConf.ASIA 2019 in Bali

PGConf.ASIA 2018 in Tokyo

PGConf.ASIA 2017 in Tokyo

PostgreSQL Conference in Russia 2016

PostgreSQL Conference in China 2015

pgCon 2015 Cluster Hacker Summit

Pgpool-II Day 2015 in Tokyo

Stable

Pgpool-II 4.6.0 officially released (2025/02/28)

Pgpool-II 4.5.6, 4.4.11, 4.3.14 and 4.2.21 officially released (2025/02/28)

Pgpool-II 4.5.5, 4.4.10, 4.3.13, 4.2.20 and 4.1.23 officially released (2024/11/28)

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09)

Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released (2024/08/15)

Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released (2024/05/16)

Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released (2024/02/29)

Pgpool-II 4.5.0 released (2023/12/12)

Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released (2023/11/30)

Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released (2023/08/17)

Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released (2023/05/18)

End-of-Life (EOL) Announcement for pgpoolAdmin (2023/02/17)

Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released (2023/01/23)

Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released (2022/12/22)

Pgpool-II 4.4.0 released (2022/12/06)

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18)

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19)

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17)

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23)

Pgpool-II 4.3.0 released (2021/12/07)

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18)

Pgpool-II 4.2.5 released (2021/09/14)

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05)

pgpoolAdmin 4.2.0 officially released (2021/06/17)

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20)

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18)

Pgpool-II 4.2.1 released (2020/12/23)

Pgpool-II 4.2.0 released (2020/11/26)

Development

Pgpool-II 4.6 RC1 released (2025/02/20)

Pgpool-II 4.6 beta1 released (2025/02/13)

Pgpool-II 4.5 RC1 released (2023/11/28)

Pgpool-II 4.5 beta1 released (2023/11/14)

Pgpool-II 4.4 RC1 released (2022/11/22)

Pgpool-II 4.4 beta1 released (2022/11/14)

Pgpool-II 4.3 RC1 released (2021/11/25)

Pgpool-II 4.3 beta2 released (2021/11/18)

Pgpool-II 4.3 beta1 released (2021/11/09)

Pgpool-II 4.2 beta1 released (2020/10/27)

Pgpool-II 4.2 alpha1 released (2020/10/06)

Old

Where can I get commercial support for Pgpool-II?

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