Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1047#issuecomment-134138815
@chiwanpark , it may need thousands of times' execution to verify, as the
failure possibility is quite low. Besides, how many times do you increased
count of sources and count of samples, the tests of reservoir samplers are
executed on seconds level, so be careful about the unit test cost as well.
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