WeiZhong94 commented on issue #9991: [FLINK-14478][python] optimize current python test cases to reduce test time. URL: https://github.com/apache/flink/pull/9991#issuecomment-546274937 @hequn8128 Thanks for your comments! I have tried running the tests with `pytest-xdist` and `pytest-parallel`. They reduce the test time significantly in my local machine, but not work on travis (The test time even increased). I guess that travis allocates too few resources to each task so that parallel execution does not lead to higher performance. The build of using `pytest-parallel` is https://travis-ci.org/WeiZhong94/flink/builds/602249179 The build of using `pytest-xdist` is https://travis-ci.org/WeiZhong94/flink/builds/602626771
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