Deprecated the DefaulteMQPull consumer (#1387)

client/src/main/java/org/apache/rocketmq/client/consumer/DefaultMQPullConsumer.java

@@ -35,8 +35,11 @@ import org.apache.rocketmq.remoting.RPCHook;
 import org.apache.rocketmq.remoting.exception.RemotingException;
 
 /**
- * Default pulling consumer
+ * Default pulling consumer.
+ * This Consumer will be removed in 2022, and a better implementation {@link DefaultLitePullConsumer} is recommend to use
+ * in the scenario of actively pulling messages.
  */
+@Deprecated
 public class DefaultMQPullConsumer extends ClientConfig implements MQPullConsumer {
 
     protected final transient DefaultMQPullConsumerImpl defaultMQPullConsumerImpl;

client/src/main/java/org/apache/rocketmq/client/consumer/MQPullConsumerScheduleService.java

@@ -31,7 +31,9 @@ import org.apache.rocketmq.common.message.MessageQueue;
 import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;
 
 /**
- * Schedule service for pull consumer
+ * Schedule service for pull consumer.
+ * This Consumer will be removed in 2022, and a better implementation {@link
+ * DefaultLitePullConsumer} is recommend to use in the scenario of actively pulling messages.
  */
 public class MQPullConsumerScheduleService {
     private final InternalLogger log = ClientLogger.getLog();

client/src/main/java/org/apache/rocketmq/client/impl/consumer/DefaultLitePullConsumerImpl.java

@@ -758,7 +758,7 @@ public class DefaultLitePullConsumerImpl implements MQConsumerInner {
                     if (subscriptionType == SubscriptionType.SUBSCRIBE) {
                         String topic = this.messageQueue.getTopic();
                         subscriptionData = rebalanceImpl.getSubscriptionInner().get(topic);
-                    } else{
+                    } else {
                         String topic = this.messageQueue.getTopic();
                         subscriptionData = FilterAPI.buildSubscriptionData(defaultLitePullConsumer.getConsumerGroup(),
                             topic, SubscriptionData.SUB_ALL);

example/src/main/java/org/apache/rocketmq/example/simple/LitePullConsumerTest.java → example/src/main/java/org/apache/rocketmq/example/simple/LitePullConsumer.java

@@ -24,12 +24,12 @@ import org.apache.rocketmq.client.consumer.DefaultLitePullConsumer;
 import org.apache.rocketmq.common.message.MessageExt;
 import org.apache.rocketmq.common.message.MessageQueue;
 
-public class LitePullConsumerTest {
+public class LitePullConsumer {
     public static void main(String[] args) throws Exception {
-        DefaultLitePullConsumer litePullConsumer = new DefaultLitePullConsumer("test");
+        DefaultLitePullConsumer litePullConsumer = new DefaultLitePullConsumer("please_rename_unique_group_name");
         litePullConsumer.setAutoCommit(false);
         litePullConsumer.start();
-        Collection<MessageQueue> mqSet = litePullConsumer.fetchMessageQueues("test400");
+        Collection<MessageQueue> mqSet = litePullConsumer.fetchMessageQueues("TopicTest");
         List<MessageQueue> list = new ArrayList<>(mqSet);
         Collection<MessageQueue> assginMq = Collections.singletonList(list.get(0));
         litePullConsumer.assign(assginMq);