| From: | Garick Hamlin <ghamlin(at)isc(dot)upenn(dot)edu> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, Simon Riggs <simon(at)2ndQuadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: [COMMITTERS] pgsql: Make standby server continuously retry restoring the next WAL |
| Date: | 2010-02-11 19:45:13 |
| Message-ID: | 20100211194513.GC5500@isc.upenn.edu |
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| Lists: | pgsql-committers pgsql-docs pgsql-hackers |
On Thu, Feb 11, 2010 at 01:22:44PM -0500, Kevin Grittner wrote:
> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>
> > I think 'rsync' has the same problem.
>
> There is a switch you can use to create the problem under rsync, but
> by default rsync copies to a temporary file name and moves the
> completed file to the target name.
>
> -Kevin
I don't use PITR, So I don't know any of the well understood facts about
PITR with postgres, but my understanding with rsync is ...
It doesn't fsync data before rename, its something like: open / write /
close / rename, which could lead to zero length files on some filesystems.
(are there other anomalies to worry about here?)
Would that be a concern?
Garick
>
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