[jira] [Created] (HBASE-9411) Increment / decrement of rpcCount in RpcServer#Connection is not protected by synchronization

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created HBASE-9411:
-----------------------------

             Summary: Increment / decrement of rpcCount in RpcServer#Connection is not protected by synchronization
                 Key: HBASE-9411
                 URL: https://issues.apache.org/jira/browse/HBASE-9411
             Project: HBase
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


Here is related code:
{code}
    /* Decrement the outstanding RPC count */
    protected void decRpcCount() {
      rpcCount--;
    }

    /* Increment the outstanding RPC count */
    protected void incRpcCount() {
      rpcCount++;
    }
{code}
Even though rpcCount is volatile, in non atomic operations (increment / decrement) different threads may get unexpected result.

See http://stackoverflow.com/questions/7805192/is-a-volatile-int-in-java-thread-safe

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