Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2378#issuecomment-56211052
@mengxr In this PR, I just tried to avoid other changes except
serialization, we could change the cache behavior or compression later.
It's will be good to have some number of about the performance regression,
I only see 5% regression in LogisticRegressionWithSGD.train() with small
dataset (locally).
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