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Date: Thu, 23 Feb 2012 01:25:49 +0000 (UTC)
From: "Todd Lipcon (Resolved) (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Resolved] (HDFS-2973) HA: re-enable NO_ACK optimization for
 block deletion
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     [ https://issues.apache.org/jira/browse/HDFS-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HDFS-2973.
-------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

Committed to HA branch (ran unit tests on this the other day)
                
> 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
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: hdfs-2973.txt
>
>
> 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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