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https://issues.apache.org/jira/browse/HDFS-4441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563182#comment-13563182
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Jing Zhao commented on HDFS-4441:
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+1 for the patch.
> Refactor INodeDirectoryWithSnapshot.Diff as a top level generic class
> ---------------------------------------------------------------------
>
> Key: HDFS-4441
> URL: https://issues.apache.org/jira/browse/HDFS-4441
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h4441_20130124.patch, h4441_20130125.patch
>
>
> INodeDirectoryWithSnapshot.Diff is for recording the difference between the
> current state and a previous state of the children list of an INodeDirectory.
> It is easy to refactor the code to support generic lists.
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