Stephen O'Donnell created HDFS-16531:
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Summary: Avoid setReplication logging an edit record if old
replication equals the new value
Key: HDFS-16531
URL: https://issues.apache.org/jira/browse/HDFS-16531
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Stephen O'Donnell
Assignee: Stephen O'Donnell
I recently came across a NN log where about 800k setRep calls were made,
setting the replication from 3 to 3 - ie leaving it unchanged.
Even in a case like this, we log an edit record, an audit log, and perform some
quota checks etc.
I believe it should be possible to avoid some of the work if we check for
oldRep == newRep and jump out of the method early.
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