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https://issues.apache.org/jira/browse/HDFS-12544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manoj Govindassamy updated HDFS-12544:
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Attachment: HDFS-12544.01.patch
Attached v01 patch to address the following
1. {{DirectorySnapshottableFeature#computeDiff}} now accepts a scope directory
to limit the computation of the diff under a snapshot root directory
2. Config to enable/disable this feature
3. Snapshot DiffReport tests to verify the new behavior
[~yzhangal]/others, can you please take a look at the patch?
> SnapshotDiff - support diff generation on any snapshot root descendant
> directory
> --------------------------------------------------------------------------------
>
> Key: HDFS-12544
> URL: https://issues.apache.org/jira/browse/HDFS-12544
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.0.0-beta1
> Reporter: Manoj Govindassamy
> Assignee: Manoj Govindassamy
> Attachments: HDFS-12544.01.patch
>
>
> {noformat}
> # hdfs snapshotDiff <snapshot_root_path> <from_snapshot_name>
> <to_snapshot_name>
> {noformat}
> Using snapshot diff command, we can generate a diff report between any two
> given snapshots under a snapshot root directory. The command today only
> accepts the path that is a snapshot root. There are many deployments where
> the snapshot root is configured at the higher level directory but the diff
> report needed is only for a specific directory under the snapshot root. In
> these cases, the diff report can be filtered for changes pertaining to the
> directory we are interested in. But when the snapshot root directory is very
> huge, the snapshot diff report generation can take minutes even if we are
> interested to know the changes only in a small directory. So, it would be
> highly performant if the diff report calculation can be limited to the
> snapshot directory only instead of the whole snapshot root.
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