codelipenghui commented on code in PR #18672:
URL: https://github.com/apache/pulsar/pull/18672#discussion_r1050465309


##########
pulsar-broker-common/src/main/java/org/apache/pulsar/bookie/rackawareness/BookieRackAffinityMapping.java:
##########
@@ -133,6 +137,28 @@ public synchronized void setConf(Configuration conf) {
         }
     }
 
+    private void watchAvailableBookies() {
+        BookieAddressResolver bookieAddressResolver = 
getBookieAddressResolver();
+        if (bookieAddressResolver instanceof DefaultBookieAddressResolver) {
+            try {
+                Field field = 
DefaultBookieAddressResolver.class.getDeclaredField("registrationClient");
+                field.setAccessible(true);
+                RegistrationClient registrationClient = (RegistrationClient) 
field.get(bookieAddressResolver);
+                registrationClient.watchWritableBookies(versioned -> {
+                    try {
+                        racksWithHost = 
bookieMappingCache.get(BOOKIE_INFO_ROOT_PATH).get()

Review Comment:
   Ah, got it. I though you want to remove the unused `Boolean.TRUE` 😂



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