Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5394
It may not be a problem in this test, but I wanted to raise that this
pattern is a bit dangerous.
If the thread ever gets interrupted while 'running' is still true, this
goes into a hot loop constantly throwing exceptions: Every time it falls
through the loop and attempts to sleep again, it will immediately throw an
Interrupted Exception.---
