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https://issues.apache.org/jira/browse/KAFKA-6946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dong Lin resolved KAFKA-6946.
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Resolution: Fixed
> Keep the session id for incremental fetch when fetch responses are throttled
> -----------------------------------------------------------------------------
>
> Key: KAFKA-6946
> URL: https://issues.apache.org/jira/browse/KAFKA-6946
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 2.0.0
> Reporter: Jon Lee
> Priority: Major
>
> The current patch for KAFKA-6028 (KIP-219) sends a FetchResponse with
> INVALID_SESSION_ID if the response needs to be throttled due to quota
> violation. If it is for incremental fetch, this will make the client reset
> its session and send a full fetch request next time. This is not a
> correctness issue, but it may affect performance when fetches are throttled.
> In case of incremental fetch, a throttled response should use the same
> session id as before so that the next unthrottled response can be in the same
> session.
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