mumrah commented on pull request #9100:
URL: https://github.com/apache/kafka/pull/9100#issuecomment-692859976
Recent changes include:
* Controller no longer sends LeaderAndIsr, only UpdateMetadata (more more
leader epoch bump)
* Update Partition's ISR from AlterIsr response
* Periodic scheduled thread for calling "propagateIsrChanges" in
AlterIsrManager (we could miss updates otherwise)
* Top-level error handling in AlterIsrManager
* Additional checks in AlterIsrManager to prevent multiple in-flight
requests and also prevent multiple ISR changes for a
given partition
* Changes to the callback logic to ensure we don't leave any partitions stuck
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