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Posted to jira@kafka.apache.org by "Michael Bingham (Jira)" <ji...@apache.org> on 2020/06/21 17:11:00 UTC
[jira] [Commented] (KAFKA-10034) Clarify Usage of "batch.size" and
"max.request.size" Producer Configs
[ https://issues.apache.org/jira/browse/KAFKA-10034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17141532#comment-17141532 ]
Michael Bingham commented on KAFKA-10034:
-----------------------------------------
Looks like {{max.request.size}} is used in 2 ways by the producer: as an up-front per-record size validation, and described in this ticket, but also as an upper bound for the overall {{ProduceRequest}} size (except in the rare case where a single batch size exceeds this limit): [https://github.com/apache/kafka/blob/2.5/clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java#L590]
> Clarify Usage of "batch.size" and "max.request.size" Producer Configs
> ---------------------------------------------------------------------
>
> Key: KAFKA-10034
> URL: https://issues.apache.org/jira/browse/KAFKA-10034
> Project: Kafka
> Issue Type: Improvement
> Components: docs, producer
> Reporter: Mark Cox
> Assignee: Badai Aqrandista
> Priority: Minor
>
> The documentation around the producer configurations "batch.size" and "max.request.size", and how they relate to one another, can be confusing.
> In reality, the "max.request.size" is a hard limit on each individual record, but the documentation makes it seem this is the maximum size of a request sent to Kafka. If there is a situation where "batch.size" is set greater than "max.request.size" (and each individual record is smaller than "max.request.size") you could end up with larger requests than expected sent to Kafka.
> There are a few things that could be considered to make this clearer:
> # Improve the documentation to clarify the two producer configurations and how they relate to each other
> # Provide a producer check, and possibly a warning, if "batch.size" is found to be greater than "max.request.size"
> # The producer could take the _minimum_ of "batch.size" or "max.request.size"
>
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