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Manoj Govindassamy commented on HDFS-12544: ------------------------------------------- Thanks for the review [~yzhangal]. Fixed the checkstyle issue and committed to trunk. Filed HADOOP-14983 to track the DistCp enhancements to support snap root descendant directories. > 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, HDFS-12544.04.patch, HDFS-12544.05.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. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org