linux-kernel - Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

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Message-ID: <20080514214347.GD23758@shareable.org>
Date:	Wed, 14 May 2008 22:43:49 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Sage Weil <sage@...dream.net>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: POHMELFS high performance network filesystem. Transactions, failover, performance.

Jeff Garzik wrote:
> Definitely.  "several leaders" aka partitioning is also becoming 
> increasing paired with efforts at enhancing locality of reference.  Both 
> Google and Amazon sort their distributed tables lexographically, which 
> [ideally] results in similar data being stored near each other.
> 
> A bit of an improvement over partitioning-by-hash, anyway, for some 
> workloads.

As with B-trees on disks, and in-memory structures, application
knowledge of locality is very much worth passing to the storage layer.

-- Jamie
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