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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