k2la opened a new pull request #8844:
URL: https://github.com/apache/pulsar/pull/8844


   ### Motivation
   When the value of "/bookies" in ZooKeeper is changed, Brokers are notified 
of the change.
   After the notification to Brokers, only one of the two BookKeeper clients 
that Brokers have seems to reflect the change.
   
   **Two BookKeeper clients that Brokers have**
   - 
https://github.com/apache/pulsar/blob/ac0c6e41f0ebe3c900bb31e41c8d40b3f60b19df/pulsar-broker/src/main/java/org/apache/pulsar/broker/ManagedLedgerClientFactory.java#L81
   - 
https://github.com/apache/pulsar/blob/102fa9de03509b86e47f58ab8e1c0dde2095da3b/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/schema/BookkeeperSchemaStorage.java#L105
   
   The client of `BookkeeperSchemaStorage` don't seems to reflect the change.
   The cause is that `ZkBookieRackAffinityMapping#onUpdate` don't run.
   
   I confirmed that I change ZkBookieRackAffinityMapping instances to use same 
`ZooKeeperDataCache` and `ZkBookieRackAffinityMapping#onUpdate` works.
   
   ### Modification
   - Set the argument of `ZkBookieRackAffinityMapping#setConf` to 
`bookieMappingCache`
   - Move `updateRacksWithHost()`


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