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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