[KAFKA-6946] Keep the session id for incremental fetch when fetch responses are throttled

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.1.0
• Component/s: core
• Assignee: Jon Lee
• Reporter: Jon Lee
• Created: 24/May/18 18:13
• Updated: 30/Apr/21 17:26
• Resolved: 11/Jun/18 17:52

Description

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. 

Issue Links

• links to: GitHub Pull Request #5164