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https://issues.apache.org/jira/browse/SPARK-12524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15071884#comment-15071884
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Cody Koeninger commented on SPARK-12524:
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mapPartitions is just giving you an iterator, what you do with it is up to
you. Have you actually tried it for your use case?
> Group by key in a pairrdd without any shuffle
> ---------------------------------------------
>
> Key: SPARK-12524
> URL: https://issues.apache.org/jira/browse/SPARK-12524
> Project: Spark
> Issue Type: Improvement
> Components: Build, Java API
> Affects Versions: 1.5.2
> Reporter: Shushant Arora
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> In a PairRDD<K,V>. When we are all values of same key are in same partition
> and want to perform group by key locally and no reduce/aggregation operation
> afterwords just further tranformation on grouped rdd. There is no facility
> for that. We have to perform shuffle which is costly.
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