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https://issues.apache.org/jira/browse/HDFS-10397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15283787#comment-15283787
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Yongjun Zhang commented on HDFS-10397:
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Hi [~liuml07],
I think it's a very good idea to do what you did in 002. I will try to review
early next week.
Thanks a lot.
> 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
> Affects Versions: 2.8.0
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Attachments: HDFS-10397.000.patch, HDFS-10397.001.patch,
> HDFS-10397.002.patch
>
>
> 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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