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https://issues.apache.org/jira/browse/KAFKA-19462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Chen updated KAFKA-19462:
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Fix Version/s: 4.2.0
> "fetch.max.bytes" config is not honored when remote + local fetch
> -----------------------------------------------------------------
>
> Key: KAFKA-19462
> URL: https://issues.apache.org/jira/browse/KAFKA-19462
> Project: Kafka
> Issue Type: Bug
> Reporter: Luke Chen
> Assignee: Luke Chen
> Priority: Major
> Fix For: 4.2.0
>
>
> Currently in local fetch case, we'll calculate the remaining bytes to be
> fetched for each partition via "fetch.max.bytes" and
> "max.partition.fetch.bytes" configs. For example:
> # Config:
> max.partition.fetch.bytes = 1MB
> fetch.max.bytes = 1.5MB
> # Topic foo has 2 partitions.
> # Consumer fetches data from topic foo
> # Fetches from foo-0 first, it got 1MB of data (max.partition.fetch.bytes),
> so remaining 0.5 MB of data available to be fetched
> # Fetches from foo-1 for max 0.5MB.
> # Total returned 1.5MB records
> However, in remote + local fetch case, because we don't know how much data we
> can fetch before querying remote log metadata manager or other resource, we
> can't have a value to tell replicaManager beforehand. Currently, we treat it
> as 0 bytes read. And that's why the final returned data could exceed the
> "fetch.max.bytes" value.
> For example:
> # Config:
> max.partition.fetch.bytes = 1MB
> fetch.max.bytes = 1.5MB
> # Topic foo has 2 partitions + topic boo has 1 partition with tiered storage
> enabled.
> # Consumer fetches data from topic foo and boo
> # Fetches from boo-0, because we don't know how much data we can get, return
> 0, and send to remote async read.
> # Fetches from foo-0, it got 1MB of data, so remaining 0.5 MB of data
> available to be fetched
> # Fetches from foo-1 for max 0.5MB.
> # remote async read for boo-0 returned 1MB data (max.partition.fetch.bytes).
> # Total returned 2.5MB records, which exceeds `fetch.max.bytes = 1.5MB`
>
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