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https://issues.apache.org/jira/browse/SPARK-14042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15205038#comment-15205038
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Apache Spark commented on SPARK-14042:
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User 'nezihyigitbasi' has created a pull request for this issue:
https://github.com/apache/spark/pull/11865
> Add support for custom coalescers
> ---------------------------------
>
> Key: SPARK-14042
> URL: https://issues.apache.org/jira/browse/SPARK-14042
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Reporter: Nezih Yigitbasi
>
> Per our discussion on the mailing list (please see
> [here|http://mail-archives.apache.org/mod_mbox//spark-dev/201602.mbox/%3CCA+g63F7aVRBH=WyyK3nvBSLCMPtSdUuL_Ge9=ww4dnmnvy4...@mail.gmail.com%3E])
> it would be nice to specify a custom coalescing policy as the current
> {{coalesce()}} method only allows the user to specify the number of
> partitions and we cannot really control much. The need for this feature
> popped up when I wanted to merge small files by coalescing them by size.
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