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

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HDFS-10397:
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             Summary: Distcp should ignore -delete option if -diff option is provided instead of exiting
                 Key: HDFS-10397
                 URL: https://issues.apache.org/jira/browse/HDFS-10397
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu


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_.



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