Matthias J. Sax created KAFKA-6400:
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Summary: Consider setting default cache size to zero in Kafka
Streams
Key: KAFKA-6400
URL: https://issues.apache.org/jira/browse/KAFKA-6400
Project: Kafka
Issue Type: Improvement
Components: streams
Affects Versions: 1.0.0
Reporter: Matthias J. Sax
Priority: Minor
Since the introduction of record caching in Kafka Streams DSL, we see regular
reports/questions of first times users about "Kafka Streams does not emit
anything" or "Kafka Streams loses messages". Those report are subject to record
caching but no bugs and indicate bad user experience.
We might consider setting the default cache size to zero to avoid those issues
and improve the experience for first time users. This hold especially for
simple word-count-demos (Note, many people don't copy out example word-count
but build their own first demo app.)
Remark: before we had caching, many users got confused about our update
semantics and that we emit an output record for each input record for windowed
aggregation (ie, please give me the "final" result"). Thus, we need to consider
this and judge with care to not go "forth and back" with default user
experience -- we did have less questions about this behavior lately.
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