[HDFS-10397] Distcp should ignore -delete option if -diff option is provided instead of exiting

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: distcp
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Mingliang Liu
• Reporter: Mingliang Liu
• Created: 12/May/16 22:06
• Updated: 30/Aug/16 01:15
• Resolved: 17/May/16 22:57

Description

In distcp, -delete and -diff options are mutually exclusive. HDFS-8828 brought strictly checking which makes the existing applications (or scripts) that work just fine with both -delete and -diff options previously stop performing because of the java.lang.IllegalArgumentException: Diff is valid only with update options exception.

To make it backward incompatible, we can ignore the -delete option, given -diff option, instead of exiting the program. Along with that, we can print a warning message saying that Diff is valid only with update options, and -delete option is ignored.

Issue Links

• is broken by: HDFS-8828 Utilize Snapshot diff report to build diff copy list in distcp
• relates to: HDFS-10556 DistCpOptions should be validated automatically