sijie commented on a change in pull request #1127: BP-29 (task 1) : Introduce 
`metadataServiceUrl`
URL: https://github.com/apache/bookkeeper/pull/1127#discussion_r166904636
 
 

 ##########
 File path: 
bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/MetadataDrivers.java
 ##########
 @@ -0,0 +1,290 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.bookkeeper.meta;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.Sets;
+import java.net.URI;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.bookkeeper.util.ReflectionUtils;
+import org.apache.commons.lang3.StringUtils;
+
+/**
+ * A driver manager for managing a set of metadata drivers.
+ *
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+@Slf4j
+public final class MetadataDrivers {
+
+    static final String ZK_CLIENT_DRIVER_CLASS = 
"org.apache.bookkeeper.meta.zk.ZKMetadataClientDriver";
+    static final String ZK_BOOKIE_DRIVER_CLASS = 
"org.apache.bookkeeper.meta.zk.ZKMetadataBookieDriver";
+    static final String BK_METADATA_CLIENT_DRIVERS_PROPERTY = 
"bookkeeper.metadata.client.drivers";
+    static final String BK_METADATA_BOOKIE_DRIVERS_PROPERTY = 
"bookkeeper.metadata.bookie.drivers";
 
 Review comment:
   what do you mean "etcd" here?

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