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https://issues.apache.org/jira/browse/SPARK-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-3740.
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Resolution: Fixed
Fix Version/s: 1.2.0
This was fixed by https://github.com/apache/spark/pull/2866
> Use a compressed bitmap to track zero sized blocks in
> HighlyCompressedMapStatus
> -------------------------------------------------------------------------------
>
> Key: SPARK-3740
> URL: https://issues.apache.org/jira/browse/SPARK-3740
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, Spark Core
> Reporter: Reynold Xin
> Assignee: Josh Rosen
> Labels: starter
> Fix For: 1.2.0
>
>
> HighlyCompressedMapStatus uses a single long to track the average block size.
> However, if a stage has a lot of zero sized outputs, this leads to
> inefficiency because executors would need to send requests to fetch zero
> sized blocks.
> We can use a compressed bitmap to track the zero-sized blocks.
> See discussion in https://github.com/apache/spark/pull/2470
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