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  1. User issues ChangeConfigRequest to Controller with global configuration that needs to be updated
  2. Controller fetches current global configuration from zk, merges with supplied and validates merged config (this part relies on KAFKA-1845)
  3. If successful, configuration is updated in zk
  4. Once broker is restarted new New global configuration is applied to it picked up by broker once restarted

Compatibility, Deprecation, and Migration Plan

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