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Re: Load distributed checkpoint

From: Martijn van Oosterhout <kleptog(at)svana(dot)org>
To: Takayuki Tsunakawa <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>
Cc: ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>,pgsql-hackers(at)postgresql(dot)org
Subject: Re: Load distributed checkpoint
Date: 2006-12-20 13:48:46
Message-ID: 20061220134846.GF12639@svana.org (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
On Wed, Dec 20, 2006 at 09:14:50PM +0900, Takayuki Tsunakawa wrote:
> > That implies that fsyncing a datafile blocks fsyncing the WAL. That
> > seems terribly unlikely (although...). What OS/Kernel/Filesystem is
> > this. I note a sync bug in linux for ext3 that may have relevence.
> 
> Oh, really?  What bug?  I've heard that ext3 reports wrong data to
> iostat when it performs writes (the data is correct when performing
> reads.)

I was referring to this in the 2.6.6 changelog:

http://www.linuxhq.com/kernel/changelog/v2.6/6/index.html

   ext3's fsync/fdatasync implementation is currently syncing the inode via a
   full journal commit even if it was unaltered.
   
However you're running a later version so that's not it.

Have a nice day,
-- 
Martijn van Oosterhout   <kleptog(at)svana(dot)org>   http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.

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