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https://issues.apache.org/jira/browse/FLINK-10050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620532#comment-16620532
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ASF GitHub Bot commented on FLINK-10050:
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EugeneYushin commented on issue #6646: [FLINK-10050] Support allowedLateness in
CoGroupedStreams
URL: https://github.com/apache/flink/pull/6646#issuecomment-422789390
Nice, CI checks have been passed. I think I have no access to Travis to
relaunch builds (at least, I don't see any button there to perform such kind of
operation).
Thanks for cooperation
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> Support 'allowedLateness' in CoGroupedStreams
> ---------------------------------------------
>
> Key: FLINK-10050
> URL: https://issues.apache.org/jira/browse/FLINK-10050
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.5.1, 1.6.0
> Reporter: eugen yushin
> Priority: Major
> Labels: pull-request-available, ready-to-commit, windows
>
> 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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