Fabian Hueske created FLINK-6969:
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Summary: Add support for deferred computation for group window
aggregates
Key: FLINK-6969
URL: https://issues.apache.org/jira/browse/FLINK-6969
Project: Flink
Issue Type: New Feature
Components: Table API & SQL
Reporter: Fabian Hueske
Deferred computation is a strategy to deal with late arriving data and avoid
updates of previous results. Instead of computing a result as soon as it is
possible (i.e., when a corresponding watermark was received), deferred
computation adds a configurable amount of slack time in which late data is
accepted before the result is compute. For example, instead of computing a
tumbling window of 1 hour at each full hour, we can add a deferred computation
interval of 15 minute to compute the result quarter past each full hour.
This approach adds latency but can reduce the number of update esp. in use
cases where the user cannot influence the generation of watermarks. It is also
useful if the data is emitted to a system that cannot update result (files or
Kafka). The deferred computation interval should be configured via the
{{QueryConfig}}.
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