Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/949#issuecomment-128580607
Hi, @tillrohrmann , current implementation of sample with fixed size would
generate fixed size sample for each partition randomly instead of the whole
dataset, user may expect the later one actually most of the time. I'm research
on how to sample fixed size elements randomly from distributed data stream, i
think we can pause this PR review until i merge the previous fix.
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