sijie commented on a change in pull request #1192: BP-29 (task 3): use metadata 
service uri for constructing registration client
URL: https://github.com/apache/bookkeeper/pull/1192#discussion_r170774019
 
 

 ##########
 File path: 
bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/MetadataDrivers.java
 ##########
 @@ -191,17 +202,28 @@ public static void registerClientDriver(String 
metadataBackendScheme,
      */
     public static void registerBookieDriver(String metadataBackendScheme,
                                             Class<? extends 
MetadataBookieDriver> driver) {
+        registerBookieDriver(metadataBackendScheme, driver, false);
+    }
+
+    @VisibleForTesting
+    public static void registerBookieDriver(String metadataBackendScheme,
+                                            Class<? extends 
MetadataBookieDriver> driver,
+                                            boolean allowOverride) {
         if (!initialized) {
             initialize();
         }
 
         String scheme = metadataBackendScheme.toLowerCase();
         MetadataBookieDriverInfo oldDriverInfo = bookieDrivers.get(scheme);
-        if (null != oldDriverInfo) {
+        if (null != oldDriverInfo && !allowOverride) {
 
 Review comment:
   same as above

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