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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