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From Robert Coli <>
Subject Re: Parallel repairs
Date Mon, 17 Aug 2015 18:31:06 GMT
On Mon, Aug 17, 2015 at 8:50 AM, Stan Lemon <> wrote:,
> Thanks for the reply.  I do have vnodes.  I was not aware of the -par flag
> on the repair command, I was actually referring to have repair run on both
> nodes A & B at the same time.  It sounds like though, that I should
> probably be using this -par flag but to do it per node sequentially one
> after the other?

That's what I was suggesting, yes.

> Right now just running 'nodetool repair' on one node is taking ~3.5 days,
> with 24 nodes I am now starting to question whether or not I should be
> increasing gc_grace_second to be much longer than the default 10 days since
> it's going to take longer than 10 days to repair the whole cluster.

Yep, I personally recommend setting it to 34 days and then kicking off
repair on the first of the month. That way you have been 3 and 7 days for
it to complete, which should in most cases be enough time.

Have you unthrottled compaction and etc.? 10 days is a long time...


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