Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/949#issuecomment-133999705
@ChengXiangLi I know that it is hard to verify random sampler
implementation. But we need to fix this test failing because of difficulty of
other pull requests verification. Some tests of other pull requests are failed
by K-S test and sampling test with fraction. There is a [JIRA
issue](https://issues.apache.org/jira/browse/FLINK-2564) covered this.
I'm testing with increased count of samples and source size. If I get a
notable result, I'll post the result.
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