[jira] [Created] (FLINK-8144) Optimize the timer logic in RowTimeUnboundedOver

["Dian Fu (JIRA)" <ji...@apache.org>]

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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