[jira] [Created] (FLINK-5363) Fire timers when window state is currently empty

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-5363:
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             Summary: Fire timers when window state is currently empty
                 Key: FLINK-5363
                 URL: https://issues.apache.org/jira/browse/FLINK-5363
             Project: Flink
          Issue Type: Bug
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek
             Fix For: 1.2.0


Currently, when a {{Trigger}} sets a timer and that timer fires in the future at a point when there is currently no data in the window state, then that timer is being ignored.

This is a problem for some users because they manually set cleanup timers and they need to be called because the trigger needs to cleanup some state. (For normal time windows this is not a problem, but for special cases built on top of {{GlobalWindows}} the current behaviour leads to problems.)



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