Shuyan Zhang created HDFS-16964:
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             Summary: Improve processing of excess redundancy after failover
                 Key: HDFS-16964
                 URL: https://issues.apache.org/jira/browse/HDFS-16964
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Shuyan Zhang


After failover, the block with excess redundancy cannot be processed until all 
replicas are not stale, because the stale ones may have been deleted. That is 
to say, we need to wait for the FBRs of all datanodes on which the block 
resides before deleting the redundant replicas. This is unnecessary, we can 
bypass stale replicas when dealing with excess replicas, and delete non-stale 
excess replicas in a more timely manner.



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