Zhe Zhang created HDFS-10977:
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             Summary: Balancer should query NameNode with a timeout
                 Key: HDFS-10977
                 URL: https://issues.apache.org/jira/browse/HDFS-10977
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: balancer & mover
            Reporter: Zhe Zhang
            Assignee: Zhe Zhang


We found a case where {{Dispatcher}} was stuck at {{getBlockList}} *forever* 
(well, several hours when we found it).



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