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https://issues.apache.org/jira/browse/HDFS-4441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562932#comment-13562932
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Jing Zhao commented on HDFS-4441:
---------------------------------

The patch looks good to me. Only some minor issues:
1. Maybe Triple, Pair, and Single can be renamed as 
DiffUndoInfo/DiffModLineage, SnapshotCopyPair, and PreviousINodeState, 
respectively? And maybe Triple and Single can be moved into the Diff class?
2. GetKey seems more like a method name?
3. It would be better to have javadoc in Diff to explain the selection of the 
value of DEFAULT_ARRAY_INITIAL_CAPACITY.

                
> 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
>
>
> 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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