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https://issues.apache.org/jira/browse/HDFS-2973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214030#comment-13214030
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Aaron T. Myers commented on HDFS-2973:
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+1, the patch looks good to me. Thanks a lot for taking care of this, Todd.
> 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
> 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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