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

["Guozhang Wang (JIRA)" <ji...@apache.org>]

Guozhang Wang created KAFKA-6443:
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             Summary: 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


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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