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https://issues.apache.org/jira/browse/SPARK-20801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16016813#comment-16016813
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Apache Spark commented on SPARK-20801:
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User 'jinxing64' has created a pull request for this issue:
https://github.com/apache/spark/pull/18031
> Store accurate size of blocks in MapStatus when it's above threshold.
> ---------------------------------------------------------------------
>
> Key: SPARK-20801
> URL: https://issues.apache.org/jira/browse/SPARK-20801
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: jin xing
>
> Currently, when number of reduces is above 2000, HighlyCompressedMapStatus is
> used to store size of blocks. in HighlyCompressedMapStatus, only average size
> is stored for non empty blocks. Which is not good for memory control when we
> shuffle blocks. It makes sense to store the accurate size of block when it's
> above threshold.
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