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help / color / mirror / Atom feedFrom: Robert Haas <[email protected]>
To: hlinnaka <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Venkata Balaji N <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Fujii Masao <[email protected]>
Cc: Borodin Vladimir <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: Streaming replication and WAL archive interactions
Date: Wed, 22 Apr 2015 16:58:31 -0400
Message-ID: <CA+TgmobeqTeka4M1=5Cm9zJR6ybD1bTUoLCPESzayz86VEiNDw@mail.gmail.com> (raw)
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On Wed, Apr 22, 2015 at 3:34 PM, Heikki Linnakangas <[email protected]> wrote:
> On 04/22/2015 10:21 PM, Robert Haas wrote:
>> On Wed, Apr 22, 2015 at 3:01 PM, Heikki Linnakangas <[email protected]>
>> wrote:
>>> For example, imagine that perform point-in-time recovery to WAL position
>>> 0/1237E568, on timeline 1. That falls within segment
>>> 000000010000000000000012. Then we end recovery, and switch to timeline 2.
>>> After the switch, and some more WAL-logged actions, we'll have these
>>> files
>>> in pg_xlog:
>>>
>>> 000000010000000000000011
>>> 000000010000000000000012
>>> 000000020000000000000012
>>> 000000020000000000000013
>>> 000000020000000000000014
>>
>>
>> Is the 000000010000000000000012 file a "partial" segment of the sort
>> you're proposing to no longer achive?
>
> If you did pure archive recovery, with no streaming replication involved,
> then no. If it was created by streaming replication, and the replication had
> not filled the whole segment yet, then yes, it would be a partial segment.
Why the difference?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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Subject: Re: Streaming replication and WAL archive interactions
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