Re: Dividing progress/debug information in pg_standby, and stat before copy

Fujii Masao <masao.fujii@gmail.com>

From: Fujii Masao <masao.fujii@gmail.com>

To: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>

Cc: Simon Riggs <simon@2ndquadrant.com>, Magnus Hagander <magnus@hagander.net>, Tom Lane <tgl@sss.pgh.pa.us>, Greg Smith <greg@2ndquadrant.com>, Selena Deckelmann <selenamarie@gmail.com>, Josh Berkus <josh@agliodbs.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2010-01-26T14:48:42Z

Lists: pgsql-hackers

On Tue, Jan 26, 2010 at 8:54 PM, Heikki Linnakangas
<heikki.linnakangas@enterprisedb.com> wrote:
> Simon Riggs wrote:
>> Currently, we had presumed
>> that standby_mode = off would be the same as Warm Standby replication,
>> using pg_standby or other.
>
> That's still true. standby_mode=off is the same as what you have in PG
> 8.4. You can still use pg_standby etc. with that.
>
>> pg_standby checks file size before returning. If you just use "cp" as
>> suggested then it would fail because the copy would start before the
>> file is ready to be copied.
>
> True. You could work around that by using a script instead of plain
> 'cp', or by making sure that no partial files appear in the archive in
> the other end.

How about just retrying SR instead of emitting a FATAL error in
RestoreArchivedFile() when a partial WAL file has been restored?

Regards,

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