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From "Jerry He (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12682) compaction thread throttle value is not correct in hbase-default.xml
Date Sun, 14 Dec 2014 06:07:13 GMT
Jerry He created HBASE-12682:
--------------------------------

             Summary: compaction thread throttle value is not correct in hbase-default.xml
                 Key: HBASE-12682
                 URL: https://issues.apache.org/jira/browse/HBASE-12682
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 2.0.0
            Reporter: Jerry He
            Assignee: Jerry He
             Fix For: 2.0.0


While doing some compaction tuning and looking up some of the parameters, I noticed that hbase.regionserver.thread.compaction.throttle
default value in the documentation and in hbase-site.xml seems to be off the mark.

{code}
  <property>
    <name>hbase.regionserver.thread.compaction.throttle</name>
    <value>2560</value>
    <description>There are two different thread pools for compactions, one for large
compactions and
      the other for small compactions. This helps to keep compaction of lean tables (such
as
        <systemitem>hbase:meta</systemitem>) fast. If a compaction is larger than
this threshold, it
      goes into the large compaction pool. In most cases, the default value is appropriate.
Default:
      2 x hbase.hstore.compaction.max x hbase.hregion.memstore.flush.size (which defaults
to 128).
      The value field assumes that the value of hbase.hregion.memstore.flush.size is unchanged
from
      the default.</description>
  </property>
{code}

It should be in bytes. Or am I miss anyting?
It is not a problem in 0.98 since the property is not in hbase-site.xml over there. It is
obtained dynamically:
{code}
throttlePoint =  conf.getLong("hbase.regionserver.thread.compaction.throttle",
          2 * maxFilesToCompact * storeConfigInfo.getMemstoreFlushSize());
{code}




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