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https://issues.apache.org/jira/browse/KAFKA-598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509060#comment-13509060
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Jun Rao commented on KAFKA-598:
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That's an interesting alternative. The main drawback that I see is the first
problem that you raised. Any consumer that subscribes to a wildcard (e.g.,
mirror maker) could be consuming a growing # of topics over time. This means
that one has to know the number of topic/partitions in order to set
max.fetch.size properly and one has to keep tweaking it as the number of
topic/partitions changes.
> decouple fetch size from max message size
> -----------------------------------------
>
> Key: KAFKA-598
> URL: https://issues.apache.org/jira/browse/KAFKA-598
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8
> Reporter: Jun Rao
> Assignee: Joel Koshy
> Attachments: KAFKA-598-v1.patch
>
>
> Currently, a consumer has to set fetch size larger than the max message size.
> This increases the memory footprint on the consumer, especially when a large
> number of topic/partition is subscribed. By decoupling the fetch size from
> max message size, we can use a smaller fetch size for normal consumption and
> when hitting a large message (hopefully rare), we automatically increase
> fetch size to max message size temporarily.
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