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https://issues.apache.org/jira/browse/KAFKA-18016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shivsundar R resolved KAFKA-18016.
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Resolution: Fixed
> Fix bugs in handling piggyback acknowledgements in ShareFetch
> -------------------------------------------------------------
>
> Key: KAFKA-18016
> URL: https://issues.apache.org/jira/browse/KAFKA-18016
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Shivsundar R
> Assignee: Shivsundar R
> Priority: Major
>
> Currently, when a ShareFetch is processed and response is received, we use
> the fetchAcknowledgements map to determine the acknowledgements sent per
> partition and call the callback accordingly. But there is a chance this map
> was updated by the ShareFetchEvent before the response was processed.
> This means we could potentially lose out on sending acknowledgements. This
> bug was found while testing using the ShareRoundTripWorker with 100k records
> and a target production rate of 1000 messages per second.
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