Ming Ma created HADOOP-10599:
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             Summary: Support prioritization of DN RPCs over client RPCs
                 Key: HADOOP-10599
                 URL: https://issues.apache.org/jira/browse/HADOOP-10599
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Ming Ma


We might need to prioritize DN RPC over client RPC so that no matter what 
application do to NN RPC and FSNamesystem's global lock, DN's requests will be 
processed timely. After a cluster is configured to have service RPC server 
separated from client RPC server, it is mitigated to some degree with fair 
FSNamesystem's global lock. Also if the NN global lock can be made more fine 
grained; such need becomes less important. Still, it will be good to evaluate 
if this is a good option.



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