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https://issues.apache.org/jira/browse/HDFS-5470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13815456#comment-13815456
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Arpit Agarwal commented on HDFS-5470:
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I was thinking of the extra inner object allocation when it may not be needed
by the caller but it makes sense from code simplicity.
+1 for the patch.
> Add back trunk's reportDiff algorithm to HDFS-2832
> --------------------------------------------------
>
> Key: HDFS-5470
> URL: https://issues.apache.org/jira/browse/HDFS-5470
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h5470_20131106.patch
>
>
> As reminded by [~shv] in HDFS-5464, the report diff algorithm uses less
> memory. It also has a faster running time. We should add it back to the
> branch.
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