Re: warning message in standby - Mailing list pgsql-hackers

From Tom Lane
Subject Re: warning message in standby
Date
Msg-id 16107.1276180697@sss.pgh.pa.us
Whole thread Raw
In response to Re: warning message in standby  (Robert Haas <robertmhaas@gmail.com>)
Responses Re: warning message in standby  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
List pgsql-hackers
Robert Haas <robertmhaas@gmail.com> writes:
> On Mon, Jun 7, 2010 at 9:21 AM, Fujii Masao <masao.fujii@gmail.com> wrote:
>> When an error is found in the WAL streamed from the master, a warning
>> message is repeated without interval forever in the standby. This
>> consumes CPU load very much, and would interfere with read-only queries.
>> To fix this problem, we should add a sleep into emode_for_corrupt_record()
>> or somewhere? Or we should stop walreceiver and retry to read WAL from
>> pg_xlog or the archive?

> I ran into this problem at one point, too, but was in the middle of
> trying to investigate a different bug and didn't have time to track
> down what was causing it.

> I think the basic question here is - if there's an error in the WAL,
> how do we expect to EVER recover?  Even if we can read from the
> archive or pg_xlog, presumably it's the same WAL - why should we be
> any more successful the second time?

What "warning message" are we talking about?  All the error cases I can
think of in WAL-application are ERROR, or likely even PANIC.
        regards, tom lane


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