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https://issues.apache.org/jira/browse/SPARK-1597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14142335#comment-14142335
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Patrick Wendell commented on SPARK-1597:
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See relevant comment here:
https://github.com/apache/spark/pull/550#issuecomment-41483260

> Add a version of reduceByKey that takes the Partitioner as a second argument
> ----------------------------------------------------------------------------
>
>                 Key: SPARK-1597
>                 URL: https://issues.apache.org/jira/browse/SPARK-1597
>             Project: Spark
>          Issue Type: Bug
>            Reporter: Matei Zaharia
>            Assignee: Sandeep Singh
>            Priority: Blocker
>
> Most of our shuffle methods can take a Partitioner or a number of partitions 
> as a second argument, but for some reason reduceByKey takes the Partitioner 
> as a *first* argument: 
> http://spark.apache.org/docs/0.9.1/api/core/#org.apache.spark.rdd.PairRDDFunctions.
>  We should deprecate that version and add one where the Partitioner is the 
> second argument.



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