Tao Jie created HADOOP-15253:

             Summary: Should update maxQueueSize when refresh call queue
                 Key: HADOOP-15253
                 URL: https://issues.apache.org/jira/browse/HADOOP-15253
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Tao Jie
            Assignee: Tao Jie

When calling {{dfsadmin -refreshCallQueue}} to update CallQueue instance, 
{{maxQueueSize}} should also be updated.
In case of changing CallQueue instance to FairCallQueue, the length of each 
queue in FairCallQueue would be 1/priorityLevels of original length of 
DefaultCallQueue. So it would be helpful for us to set the length of callqueue 
to a proper value.

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