[pgpool-general: 9005] Re: Massive performance and latency issues when remote replica is attached to cluster.
Brian Ismay
jismay at cenic.org
Fri Jan 26 08:55:13 JST 2024
I actually did have the load_balance_mode set to ON, but I caught that
before I sent the initial data-dump to the list.
--
Brian
On Wed, Jan 24, 2024 at 10:34 PM Tatsuo Ishii <ishii at sraoss.co.jp> wrote:
> > Brian,
> >
> > I have looked into the log and found some queries were sent to remote
> node (node id 2).
> > This is pretty strange because you said:
> >> Load-balancing is turned off.
> >
> > In this case every queries should be sent to primary node only (node
> > id 1).
> >
> > Are you sure that you set load_balance_node to off?
> ~~~~~~~~~~~~~~~~
> I meant "load_balance_mode".
>
> > Best reagards,
> > --
> > Tatsuo Ishii
> > SRA OSS LLC
> > English: http://www.sraoss.co.jp/index_en/
> > Japanese:http://www.sraoss.co.jp
> >
> >> Tatsuo,
> >>
> >> As requested, I re-ran pgbench with the log_per_node_statement option
> >> turned on.
> >> I included just a small excerpt, but everything I saw looked to be the
> same
> >> pattern.
> >>
> >> $ pgbench -h 10.1.1.1 -p1234 -U pgbench -c 75 -j 12 -t 500 -P 15 -r
> >> pgbench1 -M extended
> >> starting vacuum...end.
> >> progress: 15.0 s, 1044.2 tps, lat 69.690 ms stddev 7.344
> >> progress: 30.0 s, 1060.1 tps, lat 69.940 ms stddev 7.635
> >> transaction type: <builtin: TPC-B (sort of)>
> >> scaling factor: 100
> >> query mode: extended
> >> number of clients: 75
> >> number of threads: 12
> >> number of transactions per client: 500
> >> number of transactions actually processed: 37500/37500
> >> latency average = 69.725 ms
> >> latency stddev = 7.464 ms
> >> tps = 1003.125524 (including connections establishing)
> >> tps = 1004.224113 (excluding connections establishing)
> >> statement latencies in milliseconds:
> >> 0.001 \set aid random(1, 100000 * :scale)
> >> 0.001 \set bid random(1, 1 * :scale)
> >> 0.000 \set tid random(1, 10 * :scale)
> >> 0.000 \set delta random(-5000, 5000)
> >> 11.958 BEGIN;
> >> 8.933 UPDATE pgbench_accounts SET abalance = abalance + :delta
> >> WHERE aid = :aid;
> >> 8.921 SELECT abalance FROM pgbench_accounts WHERE aid = :aid;
> >> 9.230 UPDATE pgbench_tellers SET tbalance = tbalance + :delta
> >> WHERE tid = :tid;
> >> 10.102 UPDATE pgbench_branches SET bbalance = bbalance + :delta
> >> WHERE bid = :bid;
> >> 8.907 INSERT INTO pgbench_history (tid, bid, aid, delta,
> mtime)
> >> VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP);
> >> 11.671 END;
> >>
> >>
> >>
> >>
> >> -----------------------
> >>
> >> Looped through the logfile to grab the connections coming from pgbench
> and
> >> then find those:
> >>
> >> for i in `cat pgpool-Tue.log | grep "connecting\ host" | grep
> >> "10\.1\.1\.150"|awk '{print $4}'|sed "s/://"`;do cat pgpool-Tue.log
> |grep
> >> $i;done|less
> >>
> >> A snippet from there:
> >> NOTE: node_id 0 and 1 are the "local" db_nodes
> >> node_id 2 is the "remote" db_node
> >> node_id 1 is the current primary.
> >>
> >>
> >>
> >> 2024-01-23 10:10:03: pid 4507: LOG: new connection received
> >> 2024-01-23 10:10:03: pid 4507: DETAIL: connecting host=10.1.1.150
> >> port=52802
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: child.c:1860
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: select count(*) from
> >> pgbench_branches
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:224
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: SELECT pg_catalog.version()
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: SELECT count(*) FROM pg_catalog.pg_proc AS p,
> >> pg_catalog.pg_namespace AS n WHERE p.proname = 'count' AND n.oid =
> >> p.pronamespace AND n.nspname ~ '.*' AND p.provolatile = 'v'
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: select count(*) from pgbench_branches
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: vacuum pgbench_branches
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:224
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: vacuum pgbench_branches
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: vacuum pgbench_tellers
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:224
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: vacuum pgbench_tellers
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: truncate pgbench_history
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:224
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: truncate pgbench_history
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: DISCARD ALL
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:224
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: DISCARD ALL
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: DISCARD ALL
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: DISCARD ALL
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: frontend disconnection: session
> time:
> >> 0:00:00.215 user=pgbench database=pgbench1 host=10.1.1.150 port=52802
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: child.c:2076
> >> 2024-01-23 10:10:03: pid 4507: LOG: new connection received
> >> 2024-01-23 10:10:03: pid 4507: DETAIL: connecting host=10.1.1.150
> >> port=52828
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: child.c:1860
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: Parse: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: Parse: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: Bind: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: Bind: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: Execute: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: Execute: BEGIN;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: UPDATE pgbench_accounts SET abalance = abalance + $1
> >> WHERE aid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: UPDATE pgbench_accounts SET abalance = abalance + $1
> WHERE
> >> aid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: UPDATE pgbench_accounts
> SET
> >> abalance = abalance + $1 WHERE aid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: UPDATE pgbench_accounts SET abalance = abalance + $1
> >> WHERE aid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: SELECT abalance FROM pgbench_accounts WHERE aid = $1;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: SELECT abalance FROM pgbench_accounts WHERE aid = $1;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: SELECT abalance FROM
> >> pgbench_accounts WHERE aid = $1;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: SELECT abalance FROM pgbench_accounts WHERE aid =
> $1;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: UPDATE pgbench_tellers SET tbalance = tbalance + $1
> WHERE
> >> tid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: UPDATE pgbench_tellers SET tbalance = tbalance + $1
> WHERE
> >> tid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: UPDATE pgbench_tellers
> SET
> >> tbalance = tbalance + $1 WHERE tid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: UPDATE pgbench_tellers SET tbalance = tbalance + $1
> >> WHERE tid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: UPDATE pgbench_branches SET bbalance = bbalance + $1
> >> WHERE bid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: UPDATE pgbench_branches SET bbalance = bbalance + $1
> WHERE
> >> bid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: UPDATE pgbench_branches
> SET
> >> bbalance = bbalance + $1 WHERE bid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: UPDATE pgbench_branches SET bbalance = bbalance + $1
> >> WHERE bid = $2;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: INSERT INTO pgbench_history (tid, bid, aid, delta,
> mtime)
> >> VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP);
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: INSERT INTO pgbench_history (tid, bid, aid, delta,
> mtime)
> >> VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP);
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: INSERT INTO
> pgbench_history
> >> (tid, bid, aid, delta, mtime) VALUES ($1, $2, $3, $4,
> CURRENT_TIMESTAMP);
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: INSERT INTO pgbench_history (tid, bid, aid, delta,
> >> mtime) VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP);
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: Parse: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Parse: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: Parse: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: Bind: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Bind: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: Bind: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: D message
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: statement: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:914
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 0 backend pid: 19865
> >> statement: Execute: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 1 backend pid: 6857
> >> statement: Execute: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >> 2024-01-23 10:10:03: pid 4507: LOG: DB node id: 2 backend pid: 17091
> >> statement: Execute: END;
> >> 2024-01-23 10:10:03: pid 4507: LOCATION: pool_proto_modules.c:3596
> >>
> >> --
> >> Brian Ismay
> >> jismay at cenic.org
> >>
> >> On Sat, Jan 20, 2024 at 10:39 PM Tatsuo Ishii <ishii at sraoss.co.jp>
> wrote:
> >>
> >>> > Any recommendations would be greatly appreciated. So far, after
> making
> >>> > multiple tuning and settings changes there have been no meaningful
> >>> changes.
> >>> >
> >>> > What we are highly suspicious of is that the latency numbers seem to
> go
> >>> > from around .2 ms to around 8 ms. This is very close to the
> >>> round-trip-time
> >>> > between our datacenters.
> >>>
> >>> > statement latencies in milliseconds:
> >>> > 0.003 \set aid random(1, 100000 * :scale)
> >>> > 0.001 \set bid random(1, 1 * :scale)
> >>> > 0.001 \set tid random(1, 10 * :scale)
> >>> > 0.001 \set delta random(-5000, 5000)
> >>> > 8.844 BEGIN;
> >>> > 9.695 UPDATE pgbench_accounts SET abalance = abalance +
> :delta
> >>> > WHERE aid = :aid;
> >>> > 8.878 SELECT abalance FROM pgbench_accounts WHERE aid =
> :aid;
> >>> > 685.873 UPDATE pgbench_tellers SET tbalance = tbalance +
> :delta
> >>> > WHERE tid = :tid;
> >>> > 92.049 UPDATE pgbench_branches SET bbalance = bbalance +
> :delta
> >>> > WHERE bid = :bid;
> >>> > 8.826 INSERT INTO pgbench_history (tid, bid, aid, delta,
> mtime)
> >>> > VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP);
> >>> > 8.847 END;
> >>>
> >>> If BEGIN and END were sent to the remote standby node, then the
> >>> latency number makes sense. But theoretically it should not happen
> >>> because you turn off load balance mode. In this case everything should
> >>> be sent to primary except the connection establishing. But even if
> >>> load balance mode is off, pgpool establish connections to both primary
> >>> and standbys. However the default option of pgbench is establishing
> >>> connection only once at the beginning of session, meaning the
> >>> connection overhead should only happen only once in the session. Thus
> >>> I can not think of plausible reason for the latency numbers.
> >>>
> >>> Anyway, can you turn on log_per_node_statement and see everything is
> >>> sent to standby? I want to confirm that first.
> >>>
> >>> Best reagards,
> >>> --
> >>> Tatsuo Ishii
> >>> SRA OSS LLC
> >>> English: http://www.sraoss.co.jp/index_en/
> >>> Japanese:http://www.sraoss.co.jp
> >>>
> > _______________________________________________
> > pgpool-general mailing list
> > pgpool-general at pgpool.net
> > http://www.pgpool.net/mailman/listinfo/pgpool-general
> _______________________________________________
> pgpool-general mailing list
> pgpool-general at pgpool.net
> http://www.pgpool.net/mailman/listinfo/pgpool-general
>
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