Transaction Message Example

1 Transaction message status

There are three states for transaction message:

• LocalTransactionState.COMMIT_MESSAGE: commit transaction, it means that allow consumers to consume this message.
• LocalTransactionState.ROLLBACK_MESSAGE: rollback transaction, it means that the message will be deleted and not allowed to consume.
• LocalTransactionState.UNKNOW: intermediate state, it means that MQ is needed to check back to determine the status.

2 Send transactional message example

2.1 Create the transactional producer

Use TransactionMQProducerclass to create producer client, and specify a unique ProducerGroup, and you can set up a custom thread pool to process check requests. After executing the local transaction, you need to reply to MQ according to the execution result, and the reply status is described in the above section.

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.common.message.MessageExt;
import java.util.List;
public class TransactionProducer {
   public static void main(String[] args) throws MQClientException, InterruptedException {
       TransactionListener transactionListener = new TransactionListenerImpl();
       TransactionMQProducer producer = new TransactionMQProducer("please_rename_unique_group_name");
       ExecutorService executorService = new ThreadPoolExecutor(2, 5, 100, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(2000), new ThreadFactory() {
           @Override
           public Thread newThread(Runnable r) {
               Thread thread = new Thread(r);
               thread.setName("client-transaction-msg-check-thread");
               return thread;
           }
       });
       producer.setExecutorService(executorService);
       producer.setTransactionListener(transactionListener);
       producer.start();
       String[] tags = new String[] {"TagA", "TagB", "TagC", "TagD", "TagE"};
       for (int i = 0; i < 10; i++) {
           try {
               Message msg =
                   new Message("TopicTest1234", tags[i % tags.length], "KEY" + i,
                       ("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET));
               SendResult sendResult = producer.sendMessageInTransaction(msg, null);
               System.out.printf("%s%n", sendResult);
               Thread.sleep(10);
           } catch (MQClientException | UnsupportedEncodingException e) {
               e.printStackTrace();
           }
       }
       for (int i = 0; i < 100000; i++) {
           Thread.sleep(1000);
       }
       producer.shutdown();
   }
}

2.2 Implement the TransactionListener interface

The executeLocalTransaction method is used to execute local transaction when send half message succeed. It returns one of three transaction status mentioned in the previous section.

The checkLocalTransaction method is used to check the local transaction status and respond to MQ check requests. It also returns one of three transaction status mentioned in the previous section.

public class TransactionListenerImpl implements TransactionListener {
  private AtomicInteger transactionIndex = new AtomicInteger(0);
  private ConcurrentHashMap<String, Integer> localTrans = new ConcurrentHashMap<>();
  @Override
  public LocalTransactionState executeLocalTransaction(Message msg, Object arg) {
      int value = transactionIndex.getAndIncrement();
      int status = value % 3;
      localTrans.put(msg.getTransactionId(), status);
      return LocalTransactionState.UNKNOW;
  }
  @Override
  public LocalTransactionState checkLocalTransaction(MessageExt msg) {
      Integer status = localTrans.get(msg.getTransactionId());
      if (null != status) {
          switch (status) {
              case 0:
                  return LocalTransactionState.UNKNOW;
              case 1:
                  return LocalTransactionState.COMMIT_MESSAGE;
              case 2:
                  return LocalTransactionState.ROLLBACK_MESSAGE;
          }
      }
      return LocalTransactionState.COMMIT_MESSAGE;
  }
}

3 Usage Constraint

1. Messages of the transactional have no schedule and batch support.
2. In order to avoid a single message being checked too many times and lead to half queue message accumulation, we limited the number of checks for a single message to 15 times by default, but users can change this limit by change the transactionCheckMax parameter in the configuration of the broker, if one message has been checked over transactionCheckMax times, broker will discard this message and print an error log at the same time by default. Users can change this behavior by override the AbstractTransactionalMessageCheckListener class.
3. A transactional message will be checked after a certain period of time that determined by parameter transactionTimeout in the configuration of the broker. And users also can change this limit by set user property CHECK_IMMUNITY_TIME_IN_SECONDS when sending transactional message, this parameter takes precedence over the transactionTimeout parameter.
4. A transactional message maybe checked or consumed more than once.
5. Committed message reput to the user’s target topic may fail. Currently, it depends on the log record. High availability is ensured by the high availability mechanism of RocketMQ itself. If you want to ensure that the transactional message isn’t lost and the transaction integrity is guaranteed, it is recommended to use synchronous double write mechanism.
6. producerGroup for producers of transactional messages cannot be shared with producerGroup for producers of other types of messages. Unlike other types of message, transactional messages allow backward queries. MQ Server query clients by their producerGroup of producers.