tillrohrmann commented on issue #9288: [FLINK-13421] [runtime] Do not allocate slots in a MultiTaskSlot when it’s releasing children URL: https://github.com/apache/flink/pull/9288#issuecomment-516858447 Thanks for opening this PR @zhuzhurk. I have to admit that I cannot completely follow how the `ConcurrentModificationException` occurs. Could you maybe show me a stack trace of the problematic behaviour? How does it happen that we assign a new child to a `MultiTaskSlot` while it is being released? At the moment I don't see how the behaviour you've covered with the test could occur. Do you have an example which reproduces the reported problem? With such an example I could better understand the problem or one could generate logs on DEBUG log level.
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