From: | Dimitri Fontaine <dfontaine(at)hi-media(dot)com> |
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To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
Cc: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: [COMMITTERS] pgsql: Check compulsory parameters in recovery.conf in standby_mode, per |
Date: | 2010-04-06 11:20:22 |
Message-ID: | 87ochw4ykp.fsf@hi-media-techno.com |
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Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> When the startup process wakes up after sleep to replay WAL, it does
> replay all the WAL streamed that far. And if more WAL if streamed during
> the replay, it's replayed too before the next sleep. But when it does
> reach the end of already-streamed WAL, it sleeps for 100ms, and doesn't
> wake up earlier if a WAL record arrives during the sleep.
Thanks for the clear picture. It then works the same as PGQ based
consumers, including londiste. I'm now happy ☻
> So, it does increase the lag artificially, but it will keep up with the
> volume just fine.
Great. No further complain from me there. I guess it now entirely
depends on how easy it is to wake up before the end of the 100ms: it
might be that it's easier to code the signaling than to add a GUC for
the value?
Regards,
--
dim
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