eugen yushin created FLINK-10050:
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Summary: Support 'allowedLateness' in CoGroupedStreams
Key: FLINK-10050
URL: https://issues.apache.org/jira/browse/FLINK-10050
Project: Flink
Issue Type: Improvement
Components: Streaming
Reporter: eugen yushin
WindowedStream has a support of 'allowedLateness' feature, while
CoGroupedStreams are not. At the mean time, WindowedStream is an inner part of
CoGroupedStreams and all main functionality (like evictor/trigger/...) is
simply delegated to WindowedStream.
There's no chance to operate with late arriving data from previous steps in
cogroups (and joins). Consider the following flow:
a. read data from source1 -> aggregate data with allowed lateness
b. read data from source2 -> aggregate data with allowed lateness
c. cogroup/join streams a and b, and compare aggregated values
Step c doesn't accept any late data from steps a/b due to lack of
`allowedLateness` API call in CoGroupedStreams.java.
Scope: add method `WithWindow.allowedLateness` to Java API
(flink-streaming-java) and extend scala API (flink-streaming-scala).
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