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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2972) HA: small optimization building incremental block report
Date Sat, 18 Feb 2012 00:31:59 GMT
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


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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