[jira] [Created] (SPARK-24611) Clean up OutputCommitCoordinator

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-24611:
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             Summary: 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


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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