Kostas Kloudas created FLINK-6205:
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Summary: Put late elements in side output.
Key: FLINK-6205
URL: https://issues.apache.org/jira/browse/FLINK-6205
Project: Flink
Issue Type: Bug
Components: CEP
Affects Versions: 1.3.0
Reporter: Kostas Kloudas
Assignee: Kostas Kloudas
Fix For: 1.3.0
Currently the CEP library had a somehow fuzzy way to handle late events.
Essentially:
1) it accepts all events (late and early)
2) it sorts them based on event time
3) whenever a watermark arrives, it feeds them into the NFA.
This does not respecting event time.
In addition, given that the order in which elements are processed matters, this
could lead to wrong results as events may be processed by the NFA out-of-order
with respect to their timestamps.
This issue proposes to assume correctness of the watermark and consider as
late, events that arrive having a timestamp smaller than that of the last seen
watermark. In addition, late events are not silently dropped, but the user can
specify to send them to a side output, as done in the case of the
{{WindowOperator}}.
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