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From "Manoj Govindassamy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12544) SnapshotDiff - support diff generation on any snapshot root descendant directory
Date Sat, 30 Sep 2017 00:12:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Manoj Govindassamy updated HDFS-12544:
    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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