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- Managing Messages
- Advanced Features
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Managing Instances
- Viewing and Modifying Basic Information of a RabbitMQ Instance
- Viewing RabbitMQ Client Connection Addresses
- Managing RabbitMQ Instance Tags
- Resetting the RabbitMQ Instance Password
- Enabling RabbitMQ Plug-ins
- Using the rabbitmq_tracing Plug-in
- Exporting the RabbitMQ Instance List
- Deleting a RabbitMQ Instance
- Logging In to RabbitMQ Management UI
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- Applying for Increasing RabbitMQ Quotas
- Viewing Metrics and Configuring Alarms
- Viewing RabbitMQ Audit Logs
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FAQs
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Instances
- What RabbitMQ Version Does DMS for RabbitMQ Use?
- What SSL Version Does DMS for RabbitMQ Use?
- Why Can't I View the Subnet and Security Group Information During Instance Creation?
- How Are Requests Evenly Distributed to Each VM of a Cluster RabbitMQ Instance?
- Do Queues Inside a Cluster RabbitMQ Instance Have Any Redundancy Backup?
- Does DMS for RabbitMQ Support Data Persistence? How Do I Perform Scheduled Data Backups?
- How Do I Obtain the Certificate After SSL Has Been Enabled?
- Can I Change the SSL Setting of a RabbitMQ Instance?
- Can RabbitMQ Instances Be Scaled Up?
- Does RabbitMQ Support Two-Way Authentication?
- Does DMS for RabbitMQ Support CPU and Memory Upgrades?
- How Do I Disable the RabbitMQ Management UI?
- Can I Change the AZ for an Instance?
- How Do I Obtain the Region ID?
- Why Can't I Select Two AZs?
- How to Change Single-node RabbitMQ Instances to Cluster Ones?
- Can I Change the VPC and Subnet After a RabbitMQ Instance Is Created?
-
Connections
- How Do I Configure a Security Group?
- Why Does a Client Fail to Connect to a RabbitMQ Instance?
- Does DMS for RabbitMQ Support Public Access?
- Does DMS for RabbitMQ Support Cross-Region Deployment?
- Do RabbitMQ Instances Support Cross-VPC Access?
- Do RabbitMQ Instances Support Cross-Subnet Access?
- What Should I Do If I Fail to Access a RabbitMQ Instance with SSL Encryption?
- Can I Access a RabbitMQ Instance Using DNAT?
- Why Can't I Open the Management Web UI?
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- How Are Requests Evenly Distributed to Each VM of a Cluster RabbitMQ Instance?
- Do Queues Inside a Cluster RabbitMQ Instance Have Any Redundancy Backup?
- Does DMS for RabbitMQ Support Data Persistence? How Do I Perform Scheduled Data Backups?
- How Do I Obtain the Certificate After SSL Has Been Enabled?
- Can I Change the SSL Setting of a RabbitMQ Instance?
- Can RabbitMQ Instances Be Scaled Up?
- Does DMS for RabbitMQ Support MQTT?
- How Do I Clear Queue Data?
- Does DMS for RabbitMQ Support CPU and Memory Upgrades?
- How Do I Disable the RabbitMQ Management UI?
- Can I Change the AZ for an Instance?
-
Connections
- How Do I Configure a Security Group?
- Why Does a Client Fail to Connect to a RabbitMQ Instance?
- Does DMS for RabbitMQ Support Public Access?
- Does DMS for RabbitMQ Support Cross-Region Deployment?
- Does DMS for RabbitMQ Support Cross-VPC Access?
- Does DMS for RabbitMQ Support Cross-Subnet Access?
- What Should I Do If I Fail to Access a RabbitMQ Instance with SSL Encryption?
- Can I Access a RabbitMQ Instance Using DNAT?
- Why Can't I Open the Management Web UI?
- Can a Client Connect to Multiple Virtual Hosts of a RabbitMQ Instance?
- Why Does a RabbitMQ Cluster Have Only One Connection Address?
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- Messages
- Monitoring & Alarm
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Instances
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User Guide (ME-Abu Dhabi Region)
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Automatic Consumer Reconnection After a RabbitMQ Node Restart
Overview
amqp-client of RabbitMQ has a built-in reconnection mechanism with only one retry. If the reconnection fails, there will be no further retries which means that the connection is lost, and the consumer will no longer be able to consume messages, unless the consumer has an additional retry mechanism.
After amqp-client is disconnected from a node, different errors are generated depending on the node that the channel is connected to.
- If the channel is connected to the node where the queue is located, the consumer receives a shutdown signal. Then, the amqp-client reconnection mechanism takes effect and the consumer attempts to reconnect to the server. If the connection is successful, the channel continues to be connected for consumption. If the connection fails, the channel.close method is used to close the channel.
- If the channel is not connected to the node where the queue is located, consumer closure is not triggered. Instead, the server sends a cancel notification. This is not an exception for amqp-client, so no obvious error is reported in the log. However, the connection will be closed eventually.
When these two errors occur, amqp-client calls back the handleShutdownSignal and handleCancel methods. You can rewrite these methods to execute the rewritten reconnection logic during the callback. In this way, a new channel can be created for the consumer to continue consumption after a previous channel is closed.
Sample Code of Automatic Consumer Reconnection After a RabbitMQ Node Restart
The following is a Java code example which can solve the preceding two errors for continuous consumption.
package rabbitmq; import com.rabbitmq.client.*; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.util.concurrent.TimeoutException; public class RabbitConsumer { public static void main(String... args) throws IOException, TimeoutException { ConnectionFactory factory = new ConnectionFactory(); // Configure the connection address and port of the instance. factory.setHost("192.168.0.2"); factory.setPort(5672); // Configure the username and password for instance connection. factory.setUsername("name"); factory.setPassword("password"); Connection connection = factory.newConnection(); createNewConnection(connection); } // Reconnection public static void createNewConnection(Connection connection) { try { Thread.sleep(1000); Channel channel = connection.createChannel(); channel.basicQos(64); channel.basicConsume("queue-01", false, new CustomConsumer(channel, connection)); } catch (Exception e) { // e.printStackTrace(); createNewConnection(connection); } } static class CustomConsumer implements Consumer { private final Channel _channel; private final Connection _connection; public CustomConsumer(Channel channel, Connection connection) { _channel = channel; _connection = connection; } @Override public void handleConsumeOk(String consumerTag) { } @Override public void handleCancelOk(String consumerTag) { } @Override public void handleCancel(String consumerTag) throws IOException { System.out.println("handleCancel"); System.out.println(consumerTag); createNewConnection(_connection); } @Override public void handleShutdownSignal(String consumerTag, ShutdownSignalException sig) { System.out.println("handleShutdownSignal"); System.out.println(consumerTag); System.out.println(sig.getReason()); createNewConnection(_connection); } @Override public void handleRecoverOk(String consumerTag) { } @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { String message = new String(body, StandardCharsets.UTF_8); System.out.println(" [x] Received '" + message + "'"); _channel.basicAck(envelope.getDeliveryTag(), false); } } }
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