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From Yan Chunlu <springri...@gmail.com>
Subject Re: what's the difference between repair CF separately and repair the entire node?
Date Mon, 12 Sep 2011 11:00:00 GMT
I am using 0.7.4.  so it is always okay to do the routine repair on
Column Family basis? thanks!

On Fri, Sep 9, 2011 at 3:25 PM, Sylvain Lebresne <sylvain@datastax.com> wrote:
>
> On Fri, Sep 9, 2011 at 4:18 AM, Yan Chunlu <springrider@gmail.com> wrote:
> > I have 3 nodes and RF=3.  I  tried to repair every node in the cluster by
> > using "nodetool repair mykeyspace mycf" on every column family.  it finished
> > within 3 hours, the data size is no more than 50GB.
> > after the repair, I have tried using nodetool repair immediately to repair
> > the entire node, but 48 hours has past it still going on. "compactionstats"
> > shows it is doing "SSTable rebuild".
> > so I am frustrating about why does "nodetool repair" so slow?   how does it
> > different with repair every CF?
>
> What version of Cassandra are you using. If you are using something < 0.8.2,
> then it may be because "nodetool repair" used to schedule its sub-task poorly,
> in ways that were counter-productive (fixed by CASSANDRA-2816).
>
> If you are using a more recent version, then it's an interesting report.
>
> > I didn't tried to repair the system keyspace, does it also need to repair?
>
> It doesn't.
>
> --
> Sylvain

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