Duo Zhang created HBASE-19978:

             Summary: The keepalive logic is incomplete in ProcedureExecutor
                 Key: HBASE-19978
                 URL: https://issues.apache.org/jira/browse/HBASE-19978
             Project: HBase
          Issue Type: Bug
            Reporter: Duo Zhang

The worker thread will just exit after keep alive time, and we never add it 
back. The only way to add it back is through the stuck checker, this is not 
correct. Here we should start new worker thread if it is under the core pool 
size and there are pending procedures.

For now the default keep alive time is Long.MAX_VALUE which means no timeout so 
no problem, but we do allow users to set it so we need to fix it.

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