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  1. Flink
  2. FLINK-10050

Support 'allowedLateness' in CoGroupedStreams

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      Description

      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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              • Assignee:
                Unassigned
                Reporter:
                eyushin eugen yushin
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