sijie commented on a change in pull request #1089: PIP-12 Introduce builder for 
creating Producer Consumer Reader
URL: https://github.com/apache/incubator-pulsar/pull/1089#discussion_r168230414
 
 

 ##########
 File path: 
pulsar-client/src/main/java/org/apache/pulsar/client/api/ConsumerBuilder.java
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 @@ -0,0 +1,230 @@
+/**
+ * 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.pulsar.client.api;
+
+import java.io.Serializable;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * {@link ConsumerBuilder} is used to configure and create instances of {@link 
Consumer}.
+ *
+ * @see PulsarClient#newConsumer()
+ */
+public interface ConsumerBuilder extends Serializable, Cloneable {
+
+    /**
+     * Create a copy of the current consumer builder.
+     * <p>
+     * Cloning the builder can be used to share an incomplete configuration 
and specialize it multiple times. For
+     * example:
+     *
+     * <pre>
+     * ConsumerBuilder builder = client.newConsumer() //
+     *         .subscriptionName("my-subscription-name") //
+     *         .subscriptionType(SubscriptionType.Shared) //
+     *         .receiverQueueSize(10);
+     *
+     * Consumer consumer1 = builder.clone().topic(TOPIC_1).subscribe();
+     * Consumer consumer2 = builder.clone().topic(TOPIC_2).subscribe();
+     * </pre>
+     */
+    ConsumerBuilder clone();
+
+    /**
+     * Finalize the consumer creation by subscribing to the topic.
+     *
+     * <p>
+     * Subscribing to the c
 
 Review comment:
   incomplete comment?

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