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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2973) HA: re-enable NO_ACK optimization for block deletion
Date Tue, 21 Feb 2012 16:04:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212690#comment-13212690
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Suresh Srinivas commented on HDFS-2973:
---------------------------------------

Makes sense. Todd, can you please link the jira where this optimization was turned off.
                
> HA: re-enable NO_ACK optimization for block deletion
> ----------------------------------------------------
>
>                 Key: HDFS-2973
>                 URL: https://issues.apache.org/jira/browse/HDFS-2973
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>
> Currently in trunk, when a file is removed, the deletion request is sent to the DNs with
a special NO_ACK flag to indicate that they don't need to ACK the deletion. The NN itself
takes care of removing the blocks from the block map, so the deletion report would be redundant.
> In the HA branch, we disabled this to fix a failure in TestSafeMode -- when the active
NN issues a block deletion, and the standby hasn't read the edits yet, this test case expects
that it would see the block deletions.
> I don't see any actual compelling reasons for this. I think we can restore the optimization
and modify the test to pass.

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