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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-10050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16601166#comment-16601166 ] 

ASF GitHub Bot commented on FLINK-10050:
----------------------------------------

EugeneYushin opened a new pull request #6646: [FLINK-10050] Support allowedLateness in CoGroupedStreams
URL: https://github.com/apache/flink/pull/6646
 
 
   ## What is the purpose of the change
   [https://issues.apache.org/jira/browse/FLINK-10050](https://issues.apache.org/jira/browse/FLINK-10050)
   Add 'allowedLateness' method to coGroup and join streams API.
   
   
   ## Brief change log
   
   - add 'allowedLateness' for CoGroupedStreams/JoinedStreams java and scala API
   - delegate calls to underlying WindowedStream (as for Trigger/Evictor scenario)
   
   
   ## Verifying this change
   
   This change is a trivial rework.
   
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: yes
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
   

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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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