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https://issues.apache.org/jira/browse/SPARK-14259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220602#comment-15220602
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Apache Spark commented on SPARK-14259:
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User 'davies' has created a pull request for this issue:
https://github.com/apache/spark/pull/12095
> Add config to control maximum number of files when coalescing partitions
> ------------------------------------------------------------------------
>
> Key: SPARK-14259
> URL: https://issues.apache.org/jira/browse/SPARK-14259
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Nong Li
> Assignee: Takeshi Yamamuro
> Priority: Minor
> Fix For: 2.0.0
>
>
> The FileSourceStrategy currently has a config to control the maximum byte
> size of coalesced partitions. It is helpful to also have a config to control
> the maximum number of files as even small files have a non-trivial fixed
> cost. The current packing can put a lot of small files together which cases
> straggler tasks.
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