Re: Logical replication timeout problem
От | Amit Kapila |
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Тема | Re: Logical replication timeout problem |
Дата | |
Msg-id | CAA4eK1LeN1V85i2ZfU2cOj5vJjpEVSvJ6LOfAu-u7mfQrW=v1Q@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: Logical replication timeout problem (Fabrice Chapuis <fabrice636861@gmail.com>) |
Ответы |
Re: Logical replication timeout problem
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Список | pgsql-hackers |
On Mon, Sep 20, 2021 at 9:43 PM Fabrice Chapuis <fabrice636861@gmail.com> wrote: > > By passing the autovacuum parameter to off the problem did not occur right after loading the table as in our previous tests.However, the timeout occurred later. We have seen the accumulation of .snap files for several Gb. > > ... > -rw-------. 1 postgres postgres 16791226 Sep 20 15:26 xid-1238444701-lsn-2D2B-F5000000.snap > -rw-------. 1 postgres postgres 16973268 Sep 20 15:26 xid-1238444701-lsn-2D2B-F6000000.snap > -rw-------. 1 postgres postgres 16790984 Sep 20 15:26 xid-1238444701-lsn-2D2B-F7000000.snap > -rw-------. 1 postgres postgres 16988112 Sep 20 15:26 xid-1238444701-lsn-2D2B-F8000000.snap > -rw-------. 1 postgres postgres 16864593 Sep 20 15:26 xid-1238444701-lsn-2D2B-F9000000.snap > -rw-------. 1 postgres postgres 16902167 Sep 20 15:26 xid-1238444701-lsn-2D2B-FA000000.snap > -rw-------. 1 postgres postgres 16914638 Sep 20 15:26 xid-1238444701-lsn-2D2B-FB000000.snap > -rw-------. 1 postgres postgres 16782471 Sep 20 15:26 xid-1238444701-lsn-2D2B-FC000000.snap > -rw-------. 1 postgres postgres 16963667 Sep 20 15:27 xid-1238444701-lsn-2D2B-FD000000.snap > ... > Okay, still not sure why the publisher is not sending keep_alive messages in between spilling such a big transaction. If you see, we have logic in WalSndLoop() wherein each time after sending data we check whether we need to send a keep-alive message via function WalSndKeepaliveIfNecessary(). I think to debug this problem further you need to add some logs in function WalSndKeepaliveIfNecessary() to see why it is not sending keep_alive messages when all these files are being created. Did you change the default value of wal_sender_timeout/wal_receiver_timeout? What is the value of those variables in your environment? Did you see the message "terminating walsender process due to replication timeout" in your server logs? -- With Regards, Amit Kapila.
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