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- 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?
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Connections
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- Do RabbitMQ Instances Support Cross-VPC Access?
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- 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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More Documents
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User Guide (ME-Abu Dhabi Region)
- Service Overview
- Getting Started
- Process of Using RabbitMQ
- Permissions Management
- Buying a RabbitMQ Instance
- Configuring Virtual Hosts
- Accessing a RabbitMQ Instance
- Managing Messages
- Advanced Features
-
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
- Modifying RabbitMQ Instance Specifications
- Migrating RabbitMQ Services
- Applying for Increasing RabbitMQ Quotas
- Viewing Metrics and Configuring Alarms
- Viewing RabbitMQ Audit Logs
-
FAQs
-
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?
- Can a Client Connect to Multiple Virtual Hosts of a RabbitMQ Instance?
- Why Does a RabbitMQ Cluster Have Only One Connection Address?
- Messages
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Instances
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- API Reference (ME-Abu Dhabi Region)
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User Guide (Kuala Lumpur Region)
- Service Overview
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- Quotas
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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?
- What If One RabbitMQ VM Fails to Be Restarted When a Cluster RabbitMQ Instance Is Being Restarted?
- 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?
- Plug-ins
- Messages
- Monitoring & Alarm
-
Instances
- Change History
- API Reference (Kuala Lumpur Region)
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User Guide (ME-Abu Dhabi Region)
- General Reference
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Automatic Recovery of a RabbitMQ Client from Network Exceptions
Overview
Messages cannot be produced or consumed on the client due to server restart or network jitter.
With a connection retry mechanism on the client, the network connection on the client can be automatically restored. Automatic network recovery is triggered in the following scenarios:
- An exception is thrown in a connection's I/O loop.
- Socket read times out.
- Server heartbeat is lost.
- Java clients of version 4.0.0 or later support automatic network recovery by default.
- If an application uses the Connection.Close method to close a connection, automatic network recovery will not be enabled or triggered.
Sample Code for Connection Retry on a RabbitMQ Client During Network Exceptions
If the initial connection between the client and server fails, automatic recovery is not triggered. Edit the corresponding application code on the client and retry the connection to solve the problem.
The following example shows how to use a Java client to resolve an initial connection failure by retrying a connection.
ConnectionFactory factory = new ConnectionFactory(); // For RabbitMQ Java clients earlier than 4.0.0, enable the automatic recovery function. factory.setAutomaticRecoveryEnabled(true); // Configure connection settings. try { Connection conn = factory.newConnection(); } catch (java.net.ConnectException e) { Thread.sleep(5000); // apply retry logic }
Client Suggestions
- Producer
Set the Mandatory parameter to true on the producer client to avoid message losses caused by network exceptions. This setting calls the Basic.Return method to return messages to the producer when they cannot be routed to matching queues.
The following sample enables Mandatory on a Java client:
ConnectionFactory factory = new ConnectionFactory(); factory.setAutomaticRecoveryEnabled(true); Connection conn = factory.newConnection(); channel = connection.createChannel(); channel.confirmSelect(); channel.addReturnListener((replyCode, replyText, exchange, routingKey, properties, body) -> { // Process the return value. }); // The third parameter is Mandatory. channel.basicPublish("testExchange", "key", true, null, "test".getBytes());
- Consumer
Use idempotent messages on consumer clients to avoid repeated messages due to network exceptions.
The following sample sets idempotence on a Java client:
Set<Long> messageStore = new HashSet<Long>(); channel.basicConsume("queue", autoAck, "a-consumer-tag", new DefaultConsumer(channel) { @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { long deliveryTag = envelope.getDeliveryTag(); if (messageStore.contains(deliveryTag)) { // Idempotent processing channel.basicAck(deliveryTag, true); } else { try { // handle message logic // Process the message. handleMessage(envelope); // Normally acknowledge the message. channel.basicAck(deliveryTag, true); messageStore.add(deliveryTag); } catch (Exception e) { channel.basicNack(deliveryTag, true, true); } } } });
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