Name node doesn't always properly recognize health of data node
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                 Key: HDFS-577
                 URL: https://issues.apache.org/jira/browse/HDFS-577
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Allen Wittenauer


The one-way communication (data node -> name node) for node health does not 
guarantee that the data node is actually healthy.

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