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[jira] [Created] (FLINK-10050) Support 'allowedLateness' in CoGroupedStreams

eugen yushin created FLINK-10050:

             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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