Re: archive status ".ready" files may be created too early - Mailing list pgsql-hackers

From Bossart, Nathan
Subject Re: archive status ".ready" files may be created too early
Date
Msg-id 7761DE50-BA35-4832-A988-698EDFFD9319@amazon.com
Whole thread Raw
In response to Re: archive status ".ready" files may be created too early  ("alvherre@alvh.no-ip.org" <alvherre@alvh.no-ip.org>)
Responses Re: archive status ".ready" files may be created too early
List pgsql-hackers
On 8/23/21, 10:31 AM, "alvherre@alvh.no-ip.org" <alvherre@alvh.no-ip.org> wrote:
> On 2021-Aug-23, alvherre@alvh.no-ip.org wrote:
>
>> The only way .ready files are created is that XLogNotifyWrite() is
>> called.  For regular WAL files during regular operation, that only
>> happens in XLogNotifyWriteSeg().  That, in turn, only happens in
>> NotifySegmentsReadyForArchive().  But if the system runs and never
>> writes WAL records that cross WAL boundaries, that function will see
>> that both earliestSegBoundary and latestSegBoundary are MaxXLogSegno,
>> and return without doing anything.  So no segments will be notified.
>
> Nevermind -- I realized that all segments get registered, not just those
> for which we generate continuation records.

Ah, okay.  BTW the other changes you mentioned made sense to me.

Nathan


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