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From "Khaireddine Rezgui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6400) Consider setting default cache size to zero in Kafka Streams
Date Wed, 07 Mar 2018 21:30:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390270#comment-16390270
] 

Khaireddine Rezgui commented on KAFKA-6400:
-------------------------------------------

I got sometimes the same experience in my first using of kafka stream, i understand now the
issue.

Does CACHE_MAX_BYTES_BUFFERING_CONFIG is the config mentioned in  the description ?

 

> 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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