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https://issues.apache.org/jira/browse/HDFS-4141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489552#comment-13489552
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Aaron T. Myers commented on HDFS-4141:
--------------------------------------

Could I please have a day or two to review this patch? It's a pretty big patch 
and one of the core parts of the implementation, so I'd really like a chance to 
review it before it gets committed. I'll be sure to be prompt with my feedback.
                
> Directory diff in snapshots
> ---------------------------
>
>                 Key: HDFS-4141
>                 URL: https://issues.apache.org/jira/browse/HDFS-4141
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h4141_20121101.patch
>
>
> With snapshots, the same directory could have different states, e.g. 
> different sets of children, in different snapshots.  We implement a directory 
> diff algorithm in this JIRA.

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