[jira] [Created] (SPARK-32921) Extend MapOutputTracker to support tracking and serving the metadata about each merged shuffle partitions for a given shuffle in push-based shuffle scenario

["Min Shen (Jira)" <ji...@apache.org>]

Min Shen created SPARK-32921:
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             Summary: Extend MapOutputTracker to support tracking and serving the metadata about each merged shuffle partitions for a given shuffle in push-based shuffle scenario
                 Key: SPARK-32921
                 URL: https://issues.apache.org/jira/browse/SPARK-32921
             Project: Spark
          Issue Type: Sub-task
          Components: Shuffle, Spark Core
    Affects Versions: 3.1.0
            Reporter: Min Shen


Similar to MapStatus, which tracks the metadata about each map task's shuffle output, we also need to track the metadata about each merged shuffle partition with push-based shuffle. We currently term this as MergeStatus.

Since MergeStatus tracks metadata from the perspective of reducer tasks, it's not efficient to break up the metadata tracked in a MergeStatus and spread it across multiple MapStatus.



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