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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10050) Support 'allowedLateness' in CoGroupedStreams
Date Fri, 14 Sep 2018 13:49:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16614875#comment-16614875

ASF GitHub Bot commented on FLINK-10050:

kl0u commented on a change in pull request #6646: [FLINK-10050] Support allowedLateness in
URL: https://github.com/apache/flink/pull/6646#discussion_r217716951

 File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/CoGroupedStreams.java
 @@ -254,7 +260,17 @@ protected WithWindow(DataStream<T1> input1,
 		public WithWindow<T1, T2, KEY, W> evictor(Evictor<? super TaggedUnion<T1, T2>,
? super W> newEvictor) {
 			return new WithWindow<>(input1, input2, keySelector1, keySelector2, keyType,
-					windowAssigner, trigger, newEvictor);
+					windowAssigner, trigger, newEvictor, allowedLateness);
+		}
+		/**
+		 * Sets the time by which elements are allowed to be late.
+		 * @see WindowedStream#allowedLateness(Time)
+		 */
+		@PublicEvolving
+		public WithWindow<T1, T2, KEY, W> allowedLateness(Time newLateness) {
+			return new WithWindow<>(input1, input2, keySelector1, keySelector2, keyType,
 Review comment:
   Check for `null`. If the user calls `allowedLateness`, he should not pass a `null` value.

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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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