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Instances
- What RabbitMQ Version Does DMS for RabbitMQ Use?
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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 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?
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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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Instances
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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
- Monitoring & Alarm
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Instances
- Change History
- API Reference (ME-Abu Dhabi Region)
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User Guide (Kuala Lumpur Region)
- Service Overview
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- Preparing the Environment
- Buying an Instance
- Accessing a RabbitMQ Instance
- Operating RabbitMQ Instances
- Quotas
- Monitoring
- Auditing
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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?
- 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
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Instances
- Change History
- API Reference (Kuala Lumpur Region)
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User Guide (ME-Abu Dhabi Region)
- General Reference
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How Does Message Accumulation Affect Services? What Can I Do?
How Does Message Accumulation Affect Services?
Excessive message accumulation in a queue may cause memory or disk alarms. As a result, all connections will be blocked, other queues cannot be used, and the overall service quality deteriorates.
Causes of Message Accumulation
- Messages are published much faster than they are retrieved. For example, consumers process messages slowly in a certain period. It may take only 3 seconds to send a message, but 1 minute to retrieve the message. If 20 messages are sent per minute, and only one message is processed by consumers, a large number of messages will be stacked in the queue.
- Consumers are abnormal and cannot retrieve messages, while publishers keep sending messages.
- Consumers are normal, but their subscriptions to queues are abnormal.
- Consumers and their subscriptions to queues are normal, but the code logic of consumers is time-consuming, which reduces the consumption capability and results in a situation similar to 1.
Solutions to Message Accumulation
- If messages are published much faster than they are retrieved, solve the problem in the following ways:
- Add consumers to accelerate message retrieval.
- Use publisher confirmation and monitor the publishing rate and duration on the publishing end. When the duration increases significantly, apply flow control.
- If consumers are abnormal, check whether the consumer logic is correct and optimize the program.
- Check whether consumers' subscriptions to queues are normal.
- If the code logic of consumers is time-consuming, set expiration time on messages using either of the following methods:
- When creating messages, set the message expiration time by using the expiration parameter.
- Set the value of expiration in properties. The unit is ms.
AMQP.BasicProperties properties = new AMQP.BasicProperties().builder() .deliveryMode(2) .contentEncoding("UTF-8") .expiration("10000") .build(); String message = "hello rabbitmq"; channel.basicPublish(exchange, routingKey, properties, message.getBytes(StandardCharsets.UTF_8));
- Set the value of expiration on the management UI. The unit is ms.
Log in to the management UI. On the Exchanges tab page, click an exchange name to view its details. In the Publish message area, set expiration, as shown in the following figure.
- Set the value of expiration in properties. The unit is ms.
- Set the queue expiration time by using the x-message-ttl parameter. The expiration time starts when messages enter the queue. When the expiration time elapses, the messages are automatically deleted.
- Set the value of x-message-ttl in the client code. The unit is ms.
Map<String, Object> arguments = new HashMap<String, Object>(); arguments.put("x-message-ttl", 10000); channel.queueDeclare(queueName, true, false, false, arguments);
- Set the value of x-message-ttl when creating a queue on the management UI. The unit is ms.
Log in to the management UI. On the Exchanges tab page, create a queue and set the value of x-message-ttl, as shown in the following figure.
- Set the value of x-message-ttl in the client code. The unit is ms.
- When creating messages, set the message expiration time by using the expiration parameter.
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