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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4141) Directory diff in snapshots
Date Sat, 03 Nov 2012 00:52:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489885#comment-13489885
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4141:
----------------------------------------------

Aaron, thanks for the quick response.  Good point.  Let's combine the apply2Previous/apply2Current
and accessPrevious/accessCurrent methods.

> ... how will multiple snapshots of the same directory be handled? My guess is that a
single INodeDirectoryWithSnapshot will itself contain a list of Diffs, one per snapshot where
files are changed in the directory. Is the plan for those diffs to be relative to each other?

Yes, that's correct.
                
> 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, h4141_20121102b.patch, h4141_20121102.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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