Neel, can you assist with this please? On Thu, Oct 19, 2017 at 9:51 AM, Rob Emery <re-pg...@codeweavers.net> wrote:
> Hiya, > > We run postgresql-9.5 (9.5.5-1.pgdg80+1) on debian jessie (using the > postgres apt repo) with replication between two servers. We have pgagent > running on both the master and the slave using: > /usr/bin/pgagent -f host=pgserver dbname=postgres user=username > password=password -l 2 -s /home/robertemery/test/pgagent.log > where pgserver is a CNAME that we use to direct traffic to the current > master. > > We are finding that over-time, the pgagent user ends up with hundreds of > connections into the postgresql cluster from both pgagents. If we kill and > restart the pgagent process, it returns to 1. > > When we run a job the number of connections goes from 1 -> 3 then back to > 1 again; however this morning (for example) one of the servers has ended up > with 2 connections for the pgagent user: > > SELECT * FROM pg_stat_activity WHERE usename LIKE '%pgagent%'; looks like > : > > 12379;"postgres";14853;22872466;"pgagent_login_role"; > "";"192.168.1.1";"";58223;"2017-10-18 08:20:29.481096+01";"";"2017-10-19 > 09:16:25.656794+01";"2017-10-19 09:16:25.657219+01";f;"idle";;;"SELECT > J.jobid FROM pgagent.pga_job J WHERE jobenabled AND jobagentid IS > NULL AND jobnextrun <= now() AND (jobhostagent = '' OR jobhostagent = > 'pgsqla02') ORDER BY jobnextrun" > 12379;"postgres";10184;22872466;"pgagent_login_role"; > "";"192.168.1.2";"";34501;"2017-10-18 15:20:53.282212+01";"";"2017-10-19 > 09:16:29.061761+01";"2017-10-19 09:16:29.062225+01";f;"idle";;;"SELECT > J.jobid FROM pgagent.pga_job J WHERE jobenabled AND jobagentid IS > NULL AND jobnextrun <= now() AND (jobhostagent = '' OR jobhostagent = > 'pgsqla01') ORDER BY jobnextrun" > 12379;"postgres";13060;22872466;"pgagent_login_role"; > "";"192.168.1.2";"";34518;"2017-10-19 07:20:02.680711+01";"";"2017-10-19 > 07:20:02.70995+01";"2017-10-19 07:20:02.723907+01";f;"idle";;;"UPDATE > pgagent.pga_job SET jobagentid=10184, joblastrun=now() WHERE jobagentid IS > NULL AND jobid=2" > > It looks like the UPDATE statement is the new connection that's leaking. > > Looking at the pgagent log for 07:20 (we have a job that runs at 07:10, > 07:20, 07:30, 07:40) I can see: > > Thu Oct 19 07:19:57 2017 : DEBUG: Clearing inactive connections > Thu Oct 19 07:19:57 2017 : DEBUG: Connection stats: total - 1, free - 0, > deleted - 0 > Thu Oct 19 07:19:57 2017 : DEBUG: Checking for jobs to run > Thu Oct 19 07:19:57 2017 : DEBUG: Sleeping... > Thu Oct 19 07:20:02 2017 : DEBUG: Clearing inactive connections > Thu Oct 19 07:20:02 2017 : DEBUG: Connection stats: total - 1, free - 0, > deleted - 0 > Thu Oct 19 07:20:02 2017 : DEBUG: Checking for jobs to run > Thu Oct 19 07:20:02 2017 : DEBUG: Creating job thread for job 2 > Thu Oct 19 07:20:02 2017 : DEBUG: Creating DB connection: > user=pgagent_login_role host=pgserver password=password dbname=postgres > Thu Oct 19 07:20:02 2017 : DEBUG: Allocating new connection to database > postgres > Thu Oct 19 07:20:02 2017 : DEBUG: Starting job: 2 > Thu Oct 19 07:20:02 2017 : DEBUG: Destroying job thread for job 2 > Thu Oct 19 07:20:02 2017 : DEBUG: Sleeping... > Thu Oct 19 07:20:07 2017 : DEBUG: Clearing inactive connections > Thu Oct 19 07:20:07 2017 : DEBUG: Connection stats: total - 2, free - 0, > deleted - 0 > Thu Oct 19 07:20:07 2017 : DEBUG: Checking for jobs to run > Thu Oct 19 07:20:07 2017 : DEBUG: Sleeping... > > which looks like it allocates a connection but never gives it up again. > From this point on DEBUG: Connection stats: total - 2, free - 0, deleted - > 0 always shows 2. > > Looking at the run at 07:10 it looks different: > > Thu Oct 19 07:09:55 2017 : DEBUG: Clearing inactive connections > Thu Oct 19 07:09:55 2017 : DEBUG: Connection stats: total - 1, free - 0, > deleted - 0 > Thu Oct 19 07:09:55 2017 : DEBUG: Checking for jobs to run > Thu Oct 19 07:09:55 2017 : DEBUG: Sleeping... > Thu Oct 19 07:10:00 2017 : DEBUG: Clearing inactive connections > Thu Oct 19 07:10:00 2017 : DEBUG: Connection stats: total - 1, free - 0, > deleted - 0 > Thu Oct 19 07:10:00 2017 : DEBUG: Checking for jobs to run > Thu Oct 19 07:10:00 2017 : DEBUG: Creating job thread for job 2 > Thu Oct 19 07:10:01 2017 : DEBUG: Creating DB connection: > user=pgagent_login_role host=pgserver password=password dbname=postgres > Thu Oct 19 07:10:01 2017 : DEBUG: Allocating new connection to database > postgres > Thu Oct 19 07:10:01 2017 : DEBUG: Starting job: 2 > Thu Oct 19 07:10:01 2017 : DEBUG: Sleeping... > Thu Oct 19 07:10:01 2017 : DEBUG: Creating DB connection: > user=pgagent_login_role host=pgserver password=password dbname=postgres > dbname=ourdatabasename > Thu Oct 19 07:10:01 2017 : DEBUG: Allocating new connection to database > ourdatabasename > Thu Oct 19 07:10:01 2017 : DEBUG: Executing SQL step 3 (part of job 2) > Thu Oct 19 07:10:01 2017 : DEBUG: Returning connection to database > ourdatabasename > Thu Oct 19 07:10:01 2017 : DEBUG: Returning connection to database postgres > Thu Oct 19 07:10:01 2017 : DEBUG: Completed job: 2 > Thu Oct 19 07:10:01 2017 : DEBUG: Destroying job thread for job 2 > Thu Oct 19 07:10:06 2017 : DEBUG: Checking for jobs to run > Thu Oct 19 07:10:06 2017 : DEBUG: Sleeping... > > > I'm at a bit of a loss to debug this further now, it looks like a bug in > the connection pooling to me? 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