[pgpool-general: 8105] Re: Problems taking node offline
Bo Peng
pengbo at sraoss.co.jp
Tue Apr 26 14:50:47 JST 2022
Hello,
> I want to take a backend node offline and having some trouble with it.
>
> I check the status of my notes:
> template1=> show pool_nodes;
> node_id | hostname | port | status | lb_weight | role | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change
> ---------+----------------------+------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
> 0 | psql-01.mgmt.bbn.com | 5432 | up | 0.333333 | standby | 646198 | false | 0 | streaming | sync | 2022-04-25 14:19:57
> 1 | psql-02.mgmt.bbn.com | 5432 | up | 0.333333 | primary | 2115353 | true | 0 | | | 2022-04-25 14:16:24
> 2 | psql-03.mgmt.bbn.com | 5432 | up | 0.333333 | standby | 2913 | false | 0 | streaming | potential | 2022-04-25 14:24:25
> (3 rows)
>
> I want to take psql-02 offline.
>
> pcp_detach_node -h psql.mgmt.bbn.com -p 9897 -U pgpool -g -n 1
> Password:
> pcp_detach_node -- Command Successful
>
>
> I check the status again:
> template1=> show pool_nodes;
> node_id | hostname | port | status | lb_weight | role | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change
> ---------+----------------------+------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
> 0 | psql-01.mgmt.bbn.com | 5432 | up | 0.333333 | standby | 718555 | true | 0 | streaming | sync | 2022-04-25 14:19:57
> 1 | psql-02.mgmt.bbn.com | 5432 | up | 0.333333 | primary | 2373454 | false | 0 | | | 2022-04-25 14:16:24
> 2 | psql-03.mgmt.bbn.com | 5432 | up | 0.333333 | standby | 3310 | false | 0 | streaming | potential | 2022-04-25 14:24:25
> (3 rows)
>
>
> I still see psql-02 online. Why is that?
Could you share pgpool.conf and full log after running pcp_detach_node?
Which version of Pgpool-II are you using?
> Log messages during the pcp command:
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 11674: LOG: new IPC connection received
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 11674: LOG: online recovery request from local pgpool-II node received on IPC interface is forwarded to master watchdog node "psql-02.mgmt.bbn.com:9898 Linux psql-02"
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 11674: DETAIL: waiting for the reply...
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 13736: LOG: PCP process with pid: 20049 exit with SUCCESS.
> Apr 25 15:59:48 psql-02 pgpool[11672]: 2022-04-25 15:59:48: pid 13736: LOG: PCP process with pid: 20049 exits with status 0
>
>
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG: child process with pid: 19261 exits with status 256
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG: fork a new child process with pid: 20176
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG: child process with pid: 19006 exits with status 256
> Apr 25 15:59:54 psql-02 pgpool[11672]: 2022-04-25 15:59:54: pid 11672: LOG: fork a new child process with pid: 20178
>
>
>
>
>
>
>
>
>
> Jon Schewe
> Principal Software Systems Technologist
> C: +1 612.263.2718
> O: +1 952.545.5720
> jon.schewe at raytheon.com
>
> Raytheon BBN
> Raytheon Intelligence & Space
> 5775 Wayzata Blvd. Suite 630
> St. Louis Park, MN 55416
> _______________________________________________
> pgpool-general mailing list
> pgpool-general at pgpool.net
> http://www.pgpool.net/mailman/listinfo/pgpool-general
--
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS, Inc. Japan
http://www.sraoss.co.jp/
More information about the pgpool-general
mailing list