From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
---|---|
To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Steve Singer <ssinger_pg(at)sympatico(dot)ca>, Jun Ishiduka <ishizuka(dot)jun(at)po(dot)ntts(dot)co(dot)jp>, magnus(at)hagander(dot)net, heikki(dot)linnakangas(at)enterprisedb(dot)com, pgsql-hackers(at)postgresql(dot)org, robertmhaas(at)gmail(dot)com, cedric(dot)villemain(dot)debian(at)gmail(dot)com |
Subject: | Re: Online base backup from the hot-standby |
Date: | 2012-01-26 06:09:33 |
Message-ID: | CAHGQGwFH1uJAc_v3eF8SPdJQeA_D=dtPn9q0nedbHZtz16hBvw@mail.gmail.com |
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Lists: | pgsql-hackers |
On Thu, Jan 26, 2012 at 3:07 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> On Wed, Jan 25, 2012 at 8:49 AM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>> On Wed, Jan 25, 2012 at 8:16 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>>
>>>> What happens if we shutdown the WALwriter and then issue SIGHUP?
>>>
>>> SIGHUP doesn't affect full_page_writes in that case. Oh, you are concerned about
>>> the case where smart shutdown kills walwriter but some backends are
>>> still running?
>>> Currently SIGHUP affects full_page_writes and running backends use the changed
>>> new value of full_page_writes. But in the patch, SIGHUP doesn't affect...
>>>
>>> To address the problem, we should either postpone the shutdown of walwriter
>>> until all backends have gone away, or leave the update of full_page_writes to
>>> checkpointer process instead of walwriter. Thought?
>>
>> checkpointer seems the correct place to me
>
>
> Done.
Thanks a lot!!
I proposed another small patch which fixes the issue about an error message of
pg_basebackup, in this upthread. If it's reasonable, could you commit it?
http://archives.postgresql.org/message-id/CAHGQGwENjSDN=f_VDPwVQ53QRU0cu9+wZKBvwNaEXMawj-y-GQ@mail.gmail.com
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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