Dian Fu created FLINK-8144:
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Summary: Optimize the timer logic in RowTimeUnboundedOver
Key: FLINK-8144
URL: https://issues.apache.org/jira/browse/FLINK-8144
Project: Flink
Issue Type: Bug
Components: Table API & SQL
Reporter: Dian Fu
Assignee: Dian Fu
Fix For: 1.5.0
Currently the logic of {{RowTimeUnboundedOver}} is as follows:
1) When element comes, buffer it in MapState and and register a timer at
{{current watermark + 1}}
2) When event timer triggered, scan the MapState and find the elements below
the current watermark and process it. If there are remaining elements to
process, register a new timer at {{current watermark + 1}}.
Let's assume that watermark comes about 5 seconds later than the event on
average, then we will scan about 5000 times the MapState before actually
processing the events.
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