[replication] Source shouldn't update ZK if it didn't progress
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Key: HBASE-4499
URL: https://issues.apache.org/jira/browse/HBASE-4499
Project: HBase
Issue Type: Improvement
Affects Versions: 0.90.4
Reporter: Jean-Daniel Cryans
Priority: Minor
Fix For: 0.92.0
A relatively minor optimization to be done in ReplicationSource, currently it
calls ReplicationSourceManager.logPositionAndCleanOldLogs whether it made
progress or not, generating more load on ZK than necessary. The last position
should be kept around so that we can compare.
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