[
https://issues.apache.org/jira/browse/KAFKA-7758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16770273#comment-16770273
]
ASF GitHub Bot commented on KAFKA-7758:
---------------------------------------
mjsax commented on pull request #6265: KAFKA-7758: Reuse
KGroupedStream/KGroupedTable with named repartition topics
URL: https://github.com/apache/kafka/pull/6265
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
> When Naming a Repartition Topic with Aggregations Reuse Repartition Graph
> Node for Multiple Operations
> ------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-7758
> URL: https://issues.apache.org/jira/browse/KAFKA-7758
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 2.1.0
> Reporter: Bill Bejeck
> Assignee: Bill Bejeck
> Priority: Major
> Fix For: 2.2.0
>
>
> When performing aggregations that require repartitioning and the repartition
> topic name is specified, and using the resulting {{KGroupedStream}} for
> multiple operations i.e.
>
> {code:java}
> final KGroupedStream<String, String> kGroupedStream = builder.<String,
> String>stream("topic").selectKey((k, v) ->
> k).groupByKey(Grouped.as("grouping"));
> kGroupedStream.windowedBy(TimeWindows.of(Duration.ofMillis(10L))).count();
> kGroupedStream.windowedBy(TimeWindows.of(Duration.ofMillis(30L))).count();
> {code}
> If optimizations aren't enabled, Streams will attempt to build two
> repartition topics of the same name resulting in a failure creating the
> topology.
>
> However, we have enough information to re-use the existing repartition node
> via graph nodes used for building the intermediate representation of the
> topology. This ticket will make the
> behavior of reusing a {{KGroupedStream}} consistent regardless if
> optimizations are turned on or not.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
