Gyula Fora created FLINK-2802:
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Summary: Watermark triggered operators cannot progress with cyclic
flows
Key: FLINK-2802
URL: https://issues.apache.org/jira/browse/FLINK-2802
Project: Flink
Issue Type: Bug
Components: Streaming
Reporter: Gyula Fora
Priority: Blocker
The problem is that we can easily create a cyclic watermark (time) dependency
in the stream graph which will result in a deadlock for watermark triggered
operators such as the `WindowOperator`.
A solution to this could be to emit a Long.MAX_VALUE watermark from the
iteration sources.
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