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Date: Thu, 29 Sep 2011 23:43:45 +0000 (UTC)
From: "Jean-Daniel Cryans (Resolved) (JIRA)" <jira@apache.org>
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Subject: [jira] [Resolved] (HBASE-4499) [replication] Source shouldn't
 update ZK if it didn't progress
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     [ https://issues.apache.org/jira/browse/HBASE-4499?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Daniel Cryans resolved HBASE-4499.
---------------------------------------

      Resolution: Fixed
        Assignee: Chris Trezzo
    Release Note: ReplicationSource keeps track of its previous location and won't update ZK if it doesn't need to.
    Hadoop Flags: Reviewed

I tested the patch and it works as advertised, committed to 0.92 and trunk. Thanks Chris!
                
> [replication] Source shouldn't update ZK if it didn't progress
> --------------------------------------------------------------
>
>                 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
>            Assignee: Chris Trezzo
>            Priority: Minor
>             Fix For: 0.92.0
>
>         Attachments: 4499.txt
>
>
> 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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