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https://issues.apache.org/jira/browse/SPARK-7498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565778#comment-14565778
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Joseph K. Bradley commented on SPARK-7498:
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[~mengxr] I'm frequently running into this issue when I don't do a clean build. 
 As you noted above, doing a clean build solves this issue.  But somehow it 
makes it more likely than an unclean build will fail.  We'll have to see how 
much this annoys developers.

> Params.setDefault should keep varargs annotation
> ------------------------------------------------
>
>                 Key: SPARK-7498
>                 URL: https://issues.apache.org/jira/browse/SPARK-7498
>             Project: Spark
>          Issue Type: Bug
>          Components: Java API, ML
>    Affects Versions: 1.4.0
>            Reporter: Joseph K. Bradley
>            Assignee: Xiangrui Meng
>             Fix For: 1.4.0
>
>
> In [SPARK-7429] and PR [https://github.com/apache/spark/pull/5960], I added 
> the varargs annotation to Params.setDefault which takes a variable number of 
> ParamPairs.  It worked locally and on Jenkins for me.
> However, @mengxr reported issues compiling on his machine.  So I'm reverting 
> the change introduced in [https://github.com/apache/spark/pull/5960] by 
> removing varargs.



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