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Re: fsfs-reshard.py - offline FSFS resharding

From: Malcolm Rowe <malcolm-svn-dev_at_farside.org.uk>
Date: 2007-04-19 11:21:58 CEST

On Wed, Apr 18, 2007 at 11:31:38AM -0700, Daniel Rall wrote:
> > > I part-converted my copy of the ASF repository to test the
> > > restartability, producing 400 shards of 1000 files in about 5-6 minutes;
> > > going back the other way has taken about 5-6 hours so far. That's
> > > partly down to my filesystem (ext2), but it does mean that restarting a
> > > sharding operation is less than ideal, because I currently have that
> > > achieved by pre-converting to a linear structure.
> >
> > Ouch.
> I'm much less concerned about slow performance when reverting a
> sharded FS to a linear format (unless this points to some sort of bug
> past native FS deficiencies). Sharding is a good thing, right?

Sure, and it'd be nice if you could convert from a shard-by-1000 format
to a shard-by-4000 format without going via the linear format, as the
current code does :-)


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Received on Thu Apr 19 11:22:15 2007

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