[jira] [Created] (SPARK-3613) Don't record the size of each shuffle block for large jobs

["Reynold Xin (JIRA)" <ji...@apache.org>]

Reynold Xin created SPARK-3613:
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             Summary: Don't record the size of each shuffle block for large jobs
                 Key: SPARK-3613
                 URL: https://issues.apache.org/jira/browse/SPARK-3613
             Project: Spark
          Issue Type: Improvement
          Components: Shuffle, Spark Core
            Reporter: Reynold Xin
            Assignee: Reynold Xin


MapStatus saves the size of each block (1 byte per block) for a particular map task. This actually means the shuffle metadata is O(M*R), where M = num maps and R = num reduces.

If M is greater than a certain size, we should probably just send an average size instead of a whole array.






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