Github user zhijiangW commented on the issue:
https://github.com/apache/flink/pull/3455
@StephanEwen , yes, I already noticed that today and this test can pass in
my local machine. And I executed it for many loops and found that it may fail
sometimes because of the sort sequence of generated job vertex may change for
`IterationHead` and `Source`. I will make it stable and notice you when pass
CI.
Thank you!
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