[jira] [Resolved] (KAFKA-13638) Slow KTable update when forwarding multiple values from transformer

["Bruno Cadonna (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-13638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bruno Cadonna resolved KAFKA-13638.
-----------------------------------
    Resolution: Cannot Reproduce

> Slow KTable update when forwarding multiple values from transformer
> -------------------------------------------------------------------
>
>                 Key: KAFKA-13638
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13638
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 3.1.0, 3.0.0
>            Reporter: Ulrik
>            Priority: Major
>         Attachments: KafkaTest.java
>
>
> I have a topology where I stream messages from an input topic, transform the message to multiple messages (via context.forward), and then store those messages in a KTable.
> Since upgrading from kafka-streams 2.8.1 to 3.1.0 I have noticed that my tests take significantly longer time to run. 
>  
> I have attached a test class to demonstrate my scenario. When running this test with kafka-streams versions 2.8.1 and 3.1.0 I came up with the following numbers:
>  
> *Version 2.8.1*
>  * one input message and one output message: 541 ms
>  * 8 input message and 30 output message per input message (240 output messages in total): 919 ms
>  
> *Version 3.1.0*
>  * one input message and one output message: 908 ms
>  * 8 input message and 30 output message per input message (240 output messages in total): 6 sec 94 ms
>  
> Even when the transformer just transforms and forwards one input message to one output message, the test takes approx. 400 ms longer to run.
> When transforming 8 input messages to 240 output messages it takes approx 5 seconds longer.



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