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From "Dwight Smith" <>
Subject RE: Question regarding the need to run nodetool repair
Date Fri, 16 Nov 2012 00:34:14 GMT


From: Edward Capriolo [] 
Sent: Thursday, November 15, 2012 4:30 PM
Subject: Re: Question regarding the need to run nodetool repair


On Thursday, November 15, 2012, Dwight Smith
<> wrote:
> I have a 4 node cluster,  version 1.1.2, replication factor of 4,
read/write consistency of 3, level compaction. Several questions.
> 1)      Should nodetool repair be run regularly to assure it has
completed before gc_grace?  If it is not run, what are the exposures?

Yes. Lost tombstones could cause deleted data to re appear.
> 2)      If a node goes down, and is brought back up prior to the 1
hour hinted handoff expiration, should repair be run immediately?

If node is brought up prior to 1 hour. You should let the hints replay.
Repair is always safe to run.
> 3)      If the hinted handoff has expired, the plan is to remove the
node and start a fresh node in its place.  Does this approach cause
You only need to join a fresh mode if the node was down longer then gc
grace. Default is 10 days.
> Thanks

If you read and write at quorum and run repair regularly you can worry
less about the things above because they are essentially non factors. 

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