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https://issues.apache.org/jira/browse/HDFS-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814670#comment-13814670
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Tsz Wo (Nicholas), SZE commented on HDFS-5464:
----------------------------------------------

h5464_20131105[bc].patch won't work.  h5464_20131105.patch works but it uses 
more memory and longer running time.

I agree with Konstantin that the original code is better although it is 
complicated.  I will leave this for awhile and see if I could come up a better 
solution.

> Simplify block report diff calculation
> --------------------------------------
>
>                 Key: HDFS-5464
>                 URL: https://issues.apache.org/jira/browse/HDFS-5464
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Minor
>         Attachments: h5464_20131105.patch, h5464_20131105b.patch, 
> h5464_20131105c.patch
>
>
> The current calculation in BlockManager.reportDiff(..) is unnecessarily 
> complicated.  We could simplify the calculation.



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