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https://issues.apache.org/jira/browse/HDFS-4141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489885#comment-13489885
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Tsz Wo (Nicholas), SZE commented on HDFS-4141:
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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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