Github user mccheah commented on the pull request:
https://github.com/apache/spark/pull/3656#issuecomment-71526176
Seeing some problems that this PR could address so reviving this thread.
@lawlerd the configurable count would help because if it is known that the
individual objects would be large, the sampling could be set to be done more
frequently. So if sampling every 32 times is too passive then a more aggressive
option can be configured, say sampling every 5 times.
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