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Re: Streaming replication on win32, still broken

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Subject: Re: Streaming replication on win32, still broken
Date: 2010-02-17 10:27:38
Message-ID: 3f0b79eb1002170227i63ebcd9fp648c2794fcb1efda@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Wed, Feb 17, 2010 at 6:00 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> On Wed, Feb 17, 2010 at 4:07 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>> On Wed, Feb 17, 2010 at 3:03 PM, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
>>> In that case, O_DIRECT would be counterproductive, no? It maps to
>>> FILE_FLAG_NOI_BUFFERING, which makes sure it doesn't go into the
>>> cache. So the read in the startup proc is actually guaranteed to
>>> reuqire a physical read - of something we just wrote, so it'll almost
>>> certainly end up waiting for a rotation, no?
>>>
>>> Seems like getting rid of O_DIRECT here is the right thing to do,
>>> regardless of this.
>>
>> Agreed. I'll remove O_DIRECT from walreceiver.
>
> Here is the patch to do that.

Ooops! I found the bug in the patch. Here is the updated version.

Regards,

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

Attachment: remove_o_direct_from_walrcv_0217_v2.patch
Description: text/x-diff (5.5 KB)

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