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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5867) Improve Compaction Throttle Default
Date Tue, 24 Apr 2012 20:41:09 GMT
Nicolas Spiegelberg created HBASE-5867:
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             Summary: Improve Compaction Throttle Default
                 Key: HBASE-5867
                 URL: https://issues.apache.org/jira/browse/HBASE-5867
             Project: HBase
          Issue Type: Improvement
            Reporter: Nicolas Spiegelberg
            Assignee: Nicolas Spiegelberg
            Priority: Minor


We recently had a production issue where our compactions fell behind because our compaction
throttle was improperly tuned and accidentally upgraded all compactions to the large pool.
 The default from HBASE-3877 makes 1 bad assumption: the default number of flushed files in
a compaction.  Currently the algorithm is:

throttleSize ~= flushSize * 2

This assumes that the basic compaction utilizes 3 files and that all 3 files are compressed.
 In this case, "hbase.hstore.compaction.min" == 6 && the values were not very compressible.
 Both conditions should be taken into consideration.  As a default, it is less damaging for
the large thread to be slightly higher than it needs to be versus having everything accidentally
promoted.

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