Kihwal Lee created HDFS-6016:
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             Summary: Update datanode replacement policy to make writes more 
robust
                 Key: HDFS-6016
                 URL: https://issues.apache.org/jira/browse/HDFS-6016
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Kihwal Lee


As discussed in HDFS-5924, writers that are down to only one node due to node 
failures can suffer if a DN does not restart in time. We do not worry about 
writes that began with single replica. 



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