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Re: WAL Restore process during recovery

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WAL Restore process during recovery
Date: 2012-01-19 19:17:13
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Tue, Jan 17, 2012 at 6:52 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> On Mon, Jan 16, 2012 at 2:06 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>> WALRestore process asynchronously executes restore_command while
>> recovery continues working.
>> Overlaps downloading of next WAL file to reduce time delays in file
>> based archive recovery.
>> Handles cases of file-only and streaming/file correctly.
> Though I've not reviewed the patch deeply yet, I observed the following
> two problems when I tested the patch.
> When I set up streaming replication + archive (i.e., restore_command is set)
> and started the standby, I got the following error:
>    FATAL:  all AuxiliaryProcs are in use
>    LOG:  walrestore process (PID 18839) exited with exit code 1

Fixed and better documented.

> When I started an archive recovery without setting restore_command,
> it successfully finished.

Not sure exactly what you mean, but I fixed a bug that might be
something you're seeing.

 Simon Riggs         
 PostgreSQL Development, 24x7 Support, Training & Services

Attachment: walrestore_process.v2.patch
Description: text/x-patch (24.3 KB)

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