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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