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https://issues.apache.org/jira/browse/SPARK-25885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668648#comment-16668648
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Apache Spark commented on SPARK-25885:
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User 'Koraseg' has created a pull request for this issue:
https://github.com/apache/spark/pull/22894
> HighlyCompressedMapStatus deserialization optimization
> ------------------------------------------------------
>
> Key: SPARK-25885
> URL: https://issues.apache.org/jira/browse/SPARK-25885
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Artem Kupchinskiy
> Priority: Minor
>
> HighlyCompressedMapStatus uses unnecessary indirection level during
> deserialization and construction. It uses ArrayBuffer, as an interim storage,
> before the actual map construction. Since both methods could be application
> hot spots under certain workloads, it is worth to get rid of that
> intermediate level.
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