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From Sergey Tryuber <>
Subject Re: Nodetool repair and Leveled Compaction
Date Tue, 25 Sep 2012 06:27:43 GMT
Hi Radim

Unfortunately number of compaction tasks is not overestimated. The number
is decremented one-by-one and this process takes several hours for our 40GB
node(( Also, when a lot of compaction tasks appears, we see that total disk
space used (via JMX) is doubled and Cassandra really tries to compact
something. When compactions are done, "total disk space used" is back to

On 24 September 2012 19:04, Radim Kolar <> wrote:

>  Repair process by itself is going well in a background, but the issue I'm
>> concerned is a lot of unnecessary compaction tasks
> number in compaction tasks counter is over estimated. For example i have
> 1100 tasks left and if I will stop inserting data, all tasks will finish
> within 30 minutes.
> I suppose that this counter is incremented for every sstable which needs
> compaction, but its not decremented properly because you can compact about
> 20 sstables at once, and this reduces counter only by 1.

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