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https://issues.apache.org/jira/browse/SPARK-5077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-5077.
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Resolution: Incomplete
> Map output statuses can still exceed spark.akka.frameSize
> ---------------------------------------------------------
>
> Key: SPARK-5077
> URL: https://issues.apache.org/jira/browse/SPARK-5077
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 1.2.0, 1.3.0, 1.4.1
> Reporter: Josh Rosen
> Priority: Major
> Labels: bulk-closed
>
> Since HighlyCompressedMapOutputStatuses uses a bitmap for tracking empty
> blocks, its size is not bounded and thus Spark is still susceptible to
> "MapOutputTrackerMasterActor: Map output statuses
> were 11141547 bytes which exceeds spark.akka.frameSize"-type errors, even in
> 1.2.0.
> We needed to use a bitmap for tracking zero-sized blocks (see SPARK-3740;
> this isn't just a performance issue; it's necessary for correctness). This
> will require a bit more effort to fix, since we'll either have to find a way
> to use a fixed size / capped size encoding for MapOutputStatuses (which might
> require changes to let us fetch empty blocks safely) or figure out some other
> strategy for shipping these statues.
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