From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
---|---|
To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Cc: | "Kolb, Harald (NSN - DE/Munich)" <harald(dot)kolb(at)nsn(dot)com> |
Subject: | pg_subtrans keeps bloating up in the standby |
Date: | 2010-08-27 13:39:21 |
Message-ID: | AANLkTi=x1Uhfatr9OTTXjp2pYLKZpHdFamGKfJYqSw2G@mail.gmail.com |
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Lists: | pgsql-hackers |
Hi,
I received the off-list email reporting that pg_subtrans keeps bloating up
in the standby, from Harald (Thanks!). I investigated this issue and found
that the standby doesn't truncate pg_subtrans at all even though HS keeps
extending it. In the master, a checkpoint calls TruncateSUBTRANS() and
truncate old pg_subtrans entries, but in the standby, a restartpoint doesn't
do that. And I found the following comment in CreateRestartPoint():
/*
* Currently, there is no need to truncate pg_subtrans during recovery. If
* we did do that, we will need to have called StartupSUBTRANS() already
* and then TruncateSUBTRANS() would go here.
*/
I'm not sure why there is no need to truncate pg_subtrans during recovery.
To fix the issue, we should make a restartpoint call TruncateSUBTRANS().
Thought?
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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