Aaron T. Myers created HDFS-8193:
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             Summary: Add the ability to delay replica deletion for a period of 
time
                 Key: HDFS-8193
                 URL: https://issues.apache.org/jira/browse/HDFS-8193
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: namenode
    Affects Versions: 2.7.0
            Reporter: Aaron T. Myers
            Assignee: Zhe Zhang


When doing maintenance on an HDFS cluster, users may be concerned about the 
possibility of administrative mistakes or software bugs deleting replicas of 
blocks that cannot easily be restored. It would be handy if HDFS could be made 
to optionally not delete any replicas for a configurable period of time.



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