Robert Metzger created FLINK-3428:
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Summary: Add fixed time trailing timestamp/watermark extractor
Key: FLINK-3428
URL: https://issues.apache.org/jira/browse/FLINK-3428
Project: Flink
Issue Type: Improvement
Reporter: Robert Metzger
Flink currently provides only one build-in timestamp extractor, which assumes
strictly ascending timestamps. In real world use cases, timestamps are almost
never strictly ascending.
Therefore, I propose to provide an utility watermark extractor which is
generating watermarks with a fixed-time trailing.
The implementation should keep track of the highest event-time seen so far and
subtract a fixed amount of time from that event time.
This way, users can for example specify that the watermarks should always "lag
behind" 10 minutes.
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