Github user sethah commented on the issue: https://github.com/apache/spark/pull/14519 @yanboliang Can you do a quick test to make sure the shuffle write size is the expected size? For example, in logistic regression only the gradient should be serialized which is an array of `numFeatures` doubles. The expected shuffle write size is then roughly `numFeatures * 8 bytes` for each task. It would be nice to check before/after.
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