[jira] [Created] (FLINK-6007) ConcurrentModificationException in WatermarkCallbackService

[Shang Yuanchun (Jira)]

Kostas Kloudas created FLINK-6007:
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             Summary: ConcurrentModificationException in WatermarkCallbackService
                 Key: FLINK-6007
                 URL: https://issues.apache.org/jira/browse/FLINK-6007
             Project: Flink
          Issue Type: Bug
          Components: DataStream API
    Affects Versions: 1.3.0
            Reporter: Kostas Kloudas
            Assignee: Kostas Kloudas
             Fix For: 1.3.0


Currently, if an attempt is made to call {{InternalWatermarkCallbackService.unregisterKeyFromWatermarkCallback()}} from within the {{OnWatermarkCallback}}, a {{ConcurrentModificationException}} is thrown. The reason is that the {{invokeOnWatermarkCallback}} iterates over the list of keys and calls the callback for each one of them.

To fix this, the deleted keys are put into a separate list, and the deletion happens after the iteration over all keys has finished.



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