[jira] [Updated] (KAFKA-6443) KTable involved in multiple joins could result in duplicate results

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax updated KAFKA-6443:
-----------------------------------
    Fix Version/s:     (was: 2.2.0)

> KTable involved in multiple joins could result in duplicate results
> -------------------------------------------------------------------
>
>                 Key: KAFKA-6443
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6443
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>            Priority: Major
>
> Consider the following multi table-table joins:
> {code}
> table1.join(table2).join(table2);    // "join" could be replaced with "leftJoin" and "outerJoin"
> {code}
> where {{table2}} is involved multiple times in this multi-way joins. In this case, when a new record from the source topic of {{table2}} is being processing, it will send to two children down in the topology and hence may resulting in duplicated join results depending on the join types.



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