This Jira aims to implement snapshot diff operation for webHdfs filesystem.
WebHDFS: GETSNAPSHOTDIFF API NPE when param "snapshotname" is given but "oldsnapshotname" is not.
expose snapshotdiff via WebHDFS
Provide support for "hdfs snapshotDiff webhdfs://my_path"
Distcp SnapshotDiff to support WebHDFS