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Posted to dev@flink.apache.org by "Gyula Fora (JIRA)" <ji...@apache.org> on 2015/10/02 10:24:27 UTC

[jira] [Created] (FLINK-2802) Watermark triggered operators cannot progress with cyclic flows

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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