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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