[jira] [Resolved] (SPARK-3740) Use a compressed bitmap to track zero sized blocks in HighlyCompressedMapStatus

["Josh Rosen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-3740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Rosen resolved SPARK-3740.
-------------------------------
       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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