| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | hlinnaka <hlinnaka(at)iki(dot)fi> |
| Cc: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Venkata Balaji N <nag1010(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Borodin Vladimir <root(at)simply(dot)name>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Streaming replication and WAL archive interactions |
| Date: | 2015-04-22 20:58:31 |
| Message-ID: | CA+TgmobeqTeka4M1=5Cm9zJR6ybD1bTUoLCPESzayz86VEiNDw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Apr 22, 2015 at 3:34 PM, Heikki Linnakangas <hlinnaka(at)iki(dot)fi> wrote:
> On 04/22/2015 10:21 PM, Robert Haas wrote:
>> On Wed, Apr 22, 2015 at 3:01 PM, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
>> 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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