Steven Schlansker created KAFKA-19689:
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Summary: TopologyTestDriver spends most of its time forcing
changes to disk
Key: KAFKA-19689
URL: https://issues.apache.org/jira/browse/KAFKA-19689
Project: Kafka
Issue Type: Improvement
Components: streams-test-utils
Affects Versions: 4.1.0
Reporter: Steven Schlansker
Attachments: image-2025-09-08-14-07-05-768.png
We recently upgraded a Streams app to 4.1.0 and found that our unit and
integration tests feel like they take much longer and consume more system
resources. Indeed, when comparing to 4.0.0, it seems there is a significant
regression in the TopologyTestDriver - with 4.1.0, we spend a ton of time in
{{Utils.flushDir}} that did not seem to happen in 4.0.0
It looks like the test driver is syncing the entire state directory to disk for
every record processed:
!image-2025-09-08-14-07-05-768.png!
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