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Status

Current state:  [One of "Under Discussion", "Accepted", "Rejected"]Draft

Discussion thread: TBDhere [Change the link from the KIP proposal email archive to your own email thread]

JIRA: here [Change the link from KAFKA-1 to your own ticket]

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Describe the problems you are trying to solve.

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For stateful applications, one of the biggest performance bottleneck is the state shuffling. In Kafka consumer, it may hit multiple state rebalances when the client group is doing multiple rebalances.

Public Interfaces

Right now broker handles consumer state in a two-phase protocol. To be concise, we only list 3 states here: RUNNING, IN_REBALANCE and SYNC.

• When a new member joins the consumer group, if the 

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

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