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https://issues.apache.org/jira/browse/SPARK-24611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16520578#comment-16520578
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Marcelo Vanzin commented on SPARK-24611:
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One more: adjust the test so that it ensures that state is kept if multiple
{{stageStart}} calls are made.
> Clean up OutputCommitCoordinator
> --------------------------------
>
> Key: SPARK-24611
> URL: https://issues.apache.org/jira/browse/SPARK-24611
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.4.0
> Reporter: Marcelo Vanzin
> Priority: Major
>
> This is a follow up to SPARK-24589, to address some issues brought up during
> review of the change:
> - the DAGScheduler registers all stages with the coordinator, when at first
> view only result stages need to. That would save memory in the driver.
> - the coordinator can track task IDs instead of the internal "TaskIdentifier"
> type it uses; that would also save some memory, and also be more accurate.
> - {{TaskCommitDenied}} currently has a "job ID" when it's really a stage ID,
> and it contains the task attempt number, when it should probably have the
> task ID instead (like above).
> The latter is an API breakage (in a class tagged as developer API, but
> still), and also affects data written to event logs.
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