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  1. Hadoop HDFS
  2. HDFS-16443

Fix edge case where DatanodeAdminDefaultMonitor doubly enqueues a DatanodeDescriptor on exception

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      As part of the fix merged in: https://issues.apache.org/jira/browse/HDFS-16303

      There was a rare edge case noticed in DatanodeAdminDefaultMonitor which causes a DatanodeDescriptor to be added twice to the pendingNodes queue. 

      This Jira is to track the 1 line fix for this bug

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              KevinWikant Kevin Wikant
              KevinWikant Kevin Wikant
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