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https://issues.apache.org/jira/browse/HADOOP-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560246#action_12560246
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Hrishikesh commented on HADOOP-2421:
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{quote}
I'd imagined that specifying -Djdiff.prior.dir would be optional, but would 
help performance a lot, but we could make it mandatory, and emit an error if 
it's not specified. That might reduce the load on subversion somewhat.
{quote}

Yes, I would like to make -Djdiff.prior.dir  mandatory ..

Please comment

> Release JDiff report of changes between different versions of Hadoop
> --------------------------------------------------------------------
>
>                 Key: HADOOP-2421
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2421
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: build
>            Reporter: Nigel Daley
>            Priority: Minor
>
> Similar to LUCENE-1083, it would be useful to report javadoc differences (ala 
> [JDiff|http://www.jdiff.org/]) between Hadoop releases.

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