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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6451) Simplify KStreamReduce
Date Fri, 26 Jan 2018 00:13:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16340333#comment-16340333
] 

ASF GitHub Bot commented on KAFKA-6451:
---------------------------------------

tanvijaywant31 opened a new pull request #4477: KAFKA-6451: Simplifying KStreamReduce and
KStreamAggregate
URL: https://github.com/apache/kafka/pull/4477
 
 
   [KAFKA-6451](https://issues.apache.org/jira/browse/KAFKA-6451)
   
   Simplified KStreamReduce and KStreamAggregate.
   Updated comments in KStreamAggregate.
   
   

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> Simplify KStreamReduce
> ----------------------
>
>                 Key: KAFKA-6451
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6451
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 1.0.0
>            Reporter: Matthias J. Sax
>            Assignee: siva santhalingam
>            Priority: Minor
>              Labels: beginner, newbie
>
> If we do aggregations, we drop records with {{key=null}} or {{value=null}}. However,
in {{KStreamReduce}} we only early exit if {{key=null}} and process {{value=null}} – even
if we only update the state with it's old value and also only send the old value downstream
(ie, we still compute the correct result), it's undesired and wasteful and we should early
exit on {{value=null}}, too.
> This problem might occur for {{KStreamAggregate}} or other processors, too, and we need
to double check those to make sure we implement consistent behavior.



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