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From "gaojinchao (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4970) Add a parameter to change keepAliveTime of Htable thread pool.
Date Wed, 07 Dec 2011 02:47:40 GMT
Add a parameter  to change keepAliveTime of Htable thread pool.
---------------------------------------------------------------

                 Key: HBASE-4970
                 URL: https://issues.apache.org/jira/browse/HBASE-4970
             Project: HBase
          Issue Type: Improvement
          Components: client
            Reporter: gaojinchao
            Assignee: gaojinchao
            Priority: Trivial


In my cluster, I changed keepAliveTime from 60 s to 3600 s.  Increasing RES is slowed down.

Why increasing keepAliveTime of HBase thread pool is slowing down our problem occurance [RES
value increase]?

You can go through the source of sun.nio.ch.Util. Every thread hold 3 softreference of direct
buffer(mustangsrc) for reusage. The code names the 3 softreferences buffercache. If the buffer
was all occupied or none was suitable in size, and new request comes, new direct buffer is
allocated. After the service, the bigger one replaces the smaller one in buffercache. The
replaced buffer is released.

So I think we can add a parameter to change keepAliveTime of Htable thread pool.

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