Re: Pause at end of recovery

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Pause at end of recovery
Date: 2012-01-26 17:42:26
Message-ID: CAHGQGwEBbekM+2voi64kuBcSX36Gj2BRLCRx8+1x1LmhYg7M=Q@mail.gmail.com
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On Fri, Jan 27, 2012 at 12:50 AM, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
>> One idea; starting archive recovery with standby_mode=on meets your needs?
>
> I haven't tested, but probably, yes. But in that case, why do we need
> the pause_at_recovery_target *at all*? It's basically overloaded
> functionality already, but I figured it was set up that way to keep
> replication and recovery a bit separated?

AFAIK, when standby_mode = on, archive recovery pauses only at end of WAL files.
When recovery target is specified and archive recovery reaches the
target, it doesn't
pause. OTOH, when pause_at_recovery_target is set, archive recovery pauses only
at the target but not end of WAL files. Neither can cover all the usecases. So
pause_at_recovery_target was implemented.

Regards,

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center

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