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Bruno Cadonna commented on KAFKA-13638: --------------------------------------- [~Lejon] How did you measure time with your test? I cannot really reproduce your numbers. > 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. -- This message was sent by Atlassian Jira (v8.20.1#820001)