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https://issues.apache.org/jira/browse/HDFS-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-2972.
-------------------------------
Resolution: Fixed
Fix Version/s: HA branch (HDFS-1623)
Hadoop Flags: Reviewed
Committed to branch. I also tested this on a 100-node cluster.
> HA: small optimization building incremental block report
> --------------------------------------------------------
>
> Key: HDFS-2972
> URL: https://issues.apache.org/jira/browse/HDFS-2972
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: data-node, ha
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: HA branch (HDFS-1623)
>
> Attachments: hdfs-2972.txt
>
>
> Current the incremental block report is a List. However, we only really need
> to send the most recent information for each block. So, if a block becomes
> RBW and is then becomes FINALIZED before the next incremental block report,
> we should just report the FINALIZED replica. It's an easy change to just
> switch to a map by blockid.
> This is on the HA branch since HA changes the code to send RBWs in the
> incremental reports, hence it's more important for maintaining performance
> parity with trunk.
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