Re: Proposal for 9.1: WAL streaming from WAL buffers

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Proposal for 9.1: WAL streaming from WAL buffers
Date: 2010-06-14 08:42:12
Message-ID: AANLkTimxoi6TtKiAJgwFxXY4P9YHhAbGa6bJXdAYs8ns@mail.gmail.com
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On Sat, Jun 12, 2010 at 12:15 AM, Stefan Kaltenbrunner
<stefan(at)kaltenbrunner(dot)cc> wrote:
> hmm ok - but assuming sync rep we would end up with something like the
> following(hypotetically assuming each operation takes 1 time unit):
>
> originally:
>
> write 1
> sync 1
> network 1
> write 1
> sync 1
>
> total: 5
>
> whereas in the new case we would basically have the write+sync compete with
> network+write+sync in parallel(total 3 units) and we would only have to wait
> for the slower of those two sets of operations instead of the total time of
> both or am I missing something.

Yeah, this is what I'd like to say. Thanks!

Regards,

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

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