Manoj Govindassamy created HDFS-12544:
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Summary: 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
{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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