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From "Manoj Govindassamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12544) SnapshotDiff - support diff generation on any snapshot root descendant directory
Date Thu, 19 Oct 2017 22:40:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211876#comment-16211876

Manoj Govindassamy commented on HDFS-12544:

Thanks for the review comments [~yzhangal]. Good discussion on the file rename behavior w.r.t
snapshot diff for descendant directory. Thats right, the renamed files still show up in the
diff report as "R" entry even though they are moved out of the scope (descendant) directory.
To get the same behavior as the normal snapshot diff report, these renamed files whose target
is not under the scoped directory should be shown as "D" deleted entries in the report. Will
post a new patch to handle this case.

> 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, HDFS-12544.02.patch, HDFS-12544.03.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 only the interesting sub-directory of the snapshot root instead of the whole snapshot root.

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