Hi,
Horiguch's patch does not seem to record minRecoveryPoint in ReadRecord();
Attempt patch records minRecoveryPoint.
[crash recovery -> record minRecoveryPoint in control file -> archive recovery]
I think that this is an original intention of Heikki's patch.
I also found a bug in latest 9.2_stable. It does not get latest timeline and
recovery history file in archive recovery when master and standby timeline is different.
Best regards,
(2013/03/05 18:22), Kyotaro HORIGUCHI wrote:
> Hello, I could cause the behavior and might understand the cause.
>
> The head of origin/REL9_2_STABLE shows the behavior I metioned in
> the last message when using the shell script attached. 9.3dev
> runs as expected.
>
> In XLogPageRead, when RecPtr goes beyond the last page, the
> current xlog file is released and new page requested.
>
> The variables were as below at the point.
>
> StandbyRequested == true
> StandbyMode == false
> ArchiveRecoveryRequested == true
> InArchiveRecovery == false
>
> In this case, XLogPageRead immediately returns NULL before trying
> to get xlogs via streaming nor from archive. So ReadRecord
> returns NULL, then unexpectedly exits 'main redo apply loop' and
> increases timeline ID as if it were promoted.
>
> This seems fiexed by letting it try all requested
> sources. Attached patch does it and the test script runs as
> expected.
>
>> We found that PostgreSQL with this patch unexpctedly becomes
>> primary when starting up as standby. We'll do further
>> investigation for the behavior.
>>
>>>> Anyway, I've committed this to master and 9.2 now.
>>>
>>> This seems to fix the issue. We'll examine this further.
>
> regards,
>
>
>
>
--
Mitsumasa KONDO
NTT OSS Center
