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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15784) MIsuse core/maxPoolSize of LinkedBlockingQueue in ThreadPoolExecutor
Date Fri, 06 May 2016 06:59:12 GMT
Jingcheng Du created HBASE-15784:
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             Summary: MIsuse core/maxPoolSize of LinkedBlockingQueue in ThreadPoolExecutor
                 Key: HBASE-15784
                 URL: https://issues.apache.org/jira/browse/HBASE-15784
             Project: HBase
          Issue Type: Bug
          Components: Client, Replication, Thrift
            Reporter: Jingcheng Du
            Assignee: Jingcheng Du


LinkedBlockingQueue is usually used in ThreadPoolExecutor. It allows the thread pool not to
be blocked if the number of running threads in the pool is less than the max pool size and
the queue is not full.
But when the core pool size of ThreadPoolExecutor is different from the max pool size, the
things don't go as expected. When the number of running threads is the same with the core
size, more requests of executions are added into the LinkedBlockingQueue. And the requests
can be executed again only when LinkedBlockingQueue is full or some of running threads are
finished.
Thus it is better to use the same value for the core and max pool size when the LinkedBlockingQueue
is used.



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