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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