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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