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https://issues.apache.org/jira/browse/HDFS-12641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384129#comment-16384129
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Arpit Agarwal commented on HDFS-12641:
--------------------------------------

I debugged this some more and it looks like the fix is not necessary in 
branch-2.7.

The test case passes because of the following check in 
{{BlockManager#isNeededReplication}}, added by HDFS-9600. The UC block is not 
added to {{neededReplications}}.
{code}
  boolean isNeededReplication(Block b, int expected, int current) {
...
    return blockInfo.isComplete()
        && (current < expected || !isPlacementPolicySatisfied(b));
{code}

I think we can close this out without the fix.

> Backport HDFS-11755 into branch-2.7 to fix a regression in HDFS-11445
> ---------------------------------------------------------------------
>
>                 Key: HDFS-12641
>                 URL: https://issues.apache.org/jira/browse/HDFS-12641
>             Project: Hadoop HDFS
>          Issue Type: Task
>    Affects Versions: 2.7.4
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>            Priority: Blocker
>              Labels: release-blocker
>         Attachments: HDFS-12641.branch-2.7.001.patch
>
>
> Our internal testing caught a regression in HDFS-11445 when we cherry picked 
> the commit into CDH. Basically, it produces bogus missing file warnings. 
> Further analysis revealed that the regression is actually fixed by HDFS-11755.
> Because of the order commits are merged in branch-2.8 ~ trunk (HDFS-11755 was 
> committed before HDFS-11445), the regression was never actually surfaced for 
> Hadoop 2.8/3.0.0-(alpha/beta) users. Since branch-2.7 has HDFS-11445 but no 
> HDFS-11755, I suspect the regression is more visible for Hadoop 2.7.4.
> I am filing this jira to raise more awareness, than simply backporting 
> HDFS-11755 into branch-2.7.



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