Github user jinxing64 commented on the issue: https://github.com/apache/spark/pull/17276 @mridulm Thanks a lot for taking time looking into this and thanks for comments :) 1) I changed the size of underestimated blocks to be `partitionLengths.filter(_ > hc.getAvgSize).map(_ - hc.getAvgSize).sum` 2) I added a method `genBlocksDistributionStr` and call it from `ShuffleWriters`, thus avoid duplicate codes
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