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Re: Updated version of pg_receivexlog

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Jaime Casanova <jaime(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Updated version of pg_receivexlog
Date: 2011-10-27 07:46:50
Message-ID: CAHGQGwF-SA3hZci5MHONG8FjRV4wJg4hW2Uac34fEnZFJYPOXg@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thu, Oct 27, 2011 at 4:40 PM, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
> On Thu, Oct 27, 2011 at 09:29, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>> On Thu, Oct 27, 2011 at 3:29 AM, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
>>> I've applied this version with a few more minor changes that Heikki found.
>>
>> Cool!
>>
>> When I tried pg_receivexlog and checked the contents of streamed WAL file by
>> xlogdump, I found that recent WAL records that walsender has already sent don't
>> exist in that WAL file. I expected that pg_receivexlog writes the streamed WAL
>> records to the disk as soon as possible, but it doesn't. Is this
>> intentional? Or bug?
>> Am I missing something?
>
> It writes it to disk as soon as possible, but doesn't fsync() until
> the end of each segment. Are you by any chance looking at the file
> while it's running?

No. I looked at that file after shutting down the master server.

Regards,

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

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