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https://issues.apache.org/jira/browse/KAFKA-703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-703.
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Resolution: Fixed
> A fetch request in Fetch Purgatory can double count the bytes from the same
> delayed produce request
> ---------------------------------------------------------------------------------------------------
>
> Key: KAFKA-703
> URL: https://issues.apache.org/jira/browse/KAFKA-703
> Project: Kafka
> Issue Type: Bug
> Components: purgatory
> Affects Versions: 0.8.1
> Reporter: Sriram Subramanian
> Assignee: Sriram Subramanian
> Priority: Blocker
> Fix For: 0.8.2
>
>
> When a producer request is handled, the fetch purgatory is checked to ensure
> any fetch requests are satisfied. When the produce request is satisfied we do
> the check again and if the same fetch request was still in the fetch
> purgatory it would end up double counting the bytes received.
> Possible Solutions
> 1. In the delayed produce request case, do the check only after the produce
> request is satisfied. This could potentially delay the fetch request from
> being satisfied.
> 2. Remove dependency of fetch request on produce request and just look at the
> last logical log offset (which should mostly be cached). This would need the
> replica.fetch.min.bytes to be number of messages rather than bytes. This also
> helps KAFKA-671 in that we would no longer need to pass the ProduceRequest
> object to the producer purgatory and hence not have to consume any memory.
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