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A new field is required in the fetch request to bound the total number of bytes within itthe fetch response. This is covered by KIP-74

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There appear to be two sensible approaches to this problem: (1) omit partitions from fetch requests (follower) / fetch responses (leader) when they exceed their quota (2) delay them, as the existing quota mechanism does, using separate fetchers. Both appear to be valid approaches with slightly different design tradeoffs. The former was chosen to be more inline with the existing quota implementationas the underlying code changes are simpler (based on explorations of each). The details of the later are discussed here.

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