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https://issues.apache.org/jira/browse/SPARK-20715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-20715:
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Assignee: Apache Spark (was: Josh Rosen)
> MapStatuses shouldn't be redundantly stored in both ShuffleMapStage and
> MapOutputTracker
> ----------------------------------------------------------------------------------------
>
> Key: SPARK-20715
> URL: https://issues.apache.org/jira/browse/SPARK-20715
> Project: Spark
> Issue Type: Improvement
> Components: Scheduler, Shuffle
> Affects Versions: 2.3.0
> Reporter: Josh Rosen
> Assignee: Apache Spark
>
> Today the MapOutputTracker and ShuffleMapStage both maintain their own copies
> of MapStatuses. This creates the potential for bugs in case these two pieces
> of state become out of sync.
> I believe that we can improve our ability to reason about the code by storing
> this information only in the MapOutputTracker. This can also help to reduce
> driver memory consumption.
> I will provide more details in my PR, where I'll walk through the detailed
> arguments as to why we can take these two different metadata tracking formats
> and consolidate without loss of performance or correctness.
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