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https://issues.apache.org/jira/browse/HDFS-13143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shashikant Banerjee updated HDFS-13143:
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Attachment: HDFS-13143.003.patch
> SnapshotDiff - snapshotDiffReport might be inconsistent if the snapshotDiff
> calculation happens between a snapshot and the current tree
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-13143
> URL: https://issues.apache.org/jira/browse/HDFS-13143
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Shashikant Banerjee
> Assignee: Shashikant Banerjee
> Priority: Major
> Attachments: HDFS-13143.001.patch, HDFS-13143.002.patch,
> HDFS-13143.003.patch
>
>
> HDFS-12594 introduced an iterative approach for computing snapshotDiffs over
> multiple rpc calls. The iterative approach depends upon the startPath (path
> of the directory with respect to the snapshottable root) and the size of the
> createdList (0 in case the startPath refers a file) to exactly determine form
> where in each iteration the calculation has to start.
>
> In case of the diff computation between a snapshot and current tree(if any of
> the snapshot names specified in the getSnapshotDiffReport call is null or
> empty), the last SnapshotDiff associated with directory/file might change
> owing to changes in the current tree in between the rpc calls in the absence
> of a global fsn lock. This might result in consistencies in the
> snapshotDiffReport.
> In case the snapshotDiffReport computation needs to be done between the
> current tree and a snapshot, we should fall back to non-iterative approach to
> compute snapshotDiff.
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