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  • It will not be possible for the controller to send stale metadata through the LeaderAndIsr and UpdateMetadata APIs. New requests will always reflect the latest state.
  • The controller can reject inconsistent leader and ISR changes. For example, if the controller sees a broker as offline, it can refuse to add it back to the ISR even though the leader still sees the follower fetching.
  • When updating leader and ISR state, it won't be necessary to reinitialize current state (see KAFKA-8585). Preliminary testing shows this can cut controlled shutdown time down by as much as 40% (take this with a big grain of salt).
  • Partition reassignments will complete sooner since there is no delayed propagation of updated ISRscomplete only when new replicas are added to the ISR. With this change, reassignments can complete sooner because the controller does not have to await change notification.

Below we discuss the behavior of the new API in more detail.

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