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From Keith Turner <ke...@deenlo.com>
Subject Re: Throttle major compaction.
Date Thu, 28 Feb 2013 14:26:06 GMT
I thnk this could be done fairly easily with an iterator.  An iterator
configured for major compaction could rate limit data.

On Thu, Feb 28, 2013 at 8:27 AM, Denis <denis@camfex.cz> wrote:
> Hi.
>
> Major compaction loads hard disks very hard, even with
> tserver.compaction.major.concurrent.max=1
>
> Besides nice peaks on the Load Average and IOstat graps during major
> compaction, such high load also badly affects query performance and
> latency.
>
> HBase and Cassandra both have settings to throttle major compaction
> (Cassandra's default is 16 Mb/s which is about 1/3 of the peek values
> I see during Accumulo's major compaction)
>
> But it looks like Accumulo does not have such setting and I have not
> found relevant questions in the bugtracker and maillist archive.
>
> How do you deal with the major compaction and its performance effects?

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