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Date: Wed, 22 Feb 2012 20:37:49 +0000 (UTC)
From: "Todd Lipcon (Resolved) (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Resolved] (HDFS-2972) HA: small optimization building
 incremental block report
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     [ https://issues.apache.org/jira/browse/HDFS-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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