Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/1234#issuecomment-146465380
If we need to parallelize tests run by scalatest, the test cases should
extend
[ParallelTestExecution](http://doc.scalatest.org/2.2.4/index.html#org.scalatest.ParallelTestExecution).
But I think that we don't need to parallelize test yet.
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