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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: hbase 0.94.0
Date Thu, 02 Feb 2012 22:11:39 GMT
Late answer, I just came back from vacation.

On Mon, Jan 30, 2012 at 10:03 PM, Nicolas Spiegelberg
<nspiegelberg@fb.com> wrote:
> I think HFile upgrade in particular is more complicated than you think.
> We currently have production traffic running with HFileV1.  It has a 5-min
> SLA.  We can't afford to take the entire downtime to rewrite 100GB (or
> whatever) worth of data.  We need to do this while the cluster is live.

AFAIK that's how it's done, V1 files are being rewritten to V2 when a
compaction happens. You don't have to do some offline processing
before getting the cluster back online.

J-D

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