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- 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?
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- Can I Change the VPC and Subnet After a RabbitMQ Instance Is Created?
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Connections
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- 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?
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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?
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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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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
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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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Configuring Heartbeats on the RabbitMQ Client
If messages may be consumed more than 90 seconds after they are produced, enable heartbeats on the client and set the heartbeats to shorter than 90 seconds, to prevent the client from being disconnected from a cluster RabbitMQ instance.
What Is a Heartbeat?
RabbitMQ heartbeats help the application layer detect interrupted connections and unresponsive peers in a timely manner. Heartbeats also prevent some network devices from disconnecting TCP connections where there is no activity for a certain period of time. To enable heartbeats, specify the heartbeat timeout for connections.
The heartbeat timeout defines after how long the peer TCP connection is considered closed by the server or client. The server and client negotiate the timeout value. The client must be configured with the value to request heartbeats. The Java, .NET, and Erlang clients maintained by RabbitMQ use the following negotiation logic:
- If the heartbeat timeout set on neither the server nor the client is 0, the smaller value is used.
- If the heartbeat timeout is set to 0 on either the server or the client, the non-zero value is used.
- If the heartbeat timeout set on both the server and the client is 0, heartbeats are disabled.
After the heartbeat timeout is configured, the RabbitMQ server and client send AMQP heartbeat frames to each other at an interval of half the heartbeat timeout. After a client misses two heartbeats, it is considered unreachable and the TCP connection is closed. If the client detects that the server cannot be accessed due to heartbeats, the client needs to reconnect to the server. For more information about heartbeats, see Detecting Dead TCP Connections with Heartbeats and TCP Keepalives.
Some clients (such as C clients) do not have the logic for sending heartbeats. Even if the heartbeat timeout is configured and heartbeats are enabled, heartbeats still cannot be sent. In this case, an extra thread needs to be started to compile the logic for sending heartbeats.
LVS Heartbeat Timeout
Cluster RabbitMQ instances use Linux Virtual Servers (LVSs) for load balancing, as shown in Figure 1. Single-node instances do not have LVSs.
LVS configures a heartbeat timeout of 90 seconds by default on client connections. If a client does not send a heartbeat (AMQP heartbeat frames or messages) to LVS for 90 seconds, LVS disconnects the client and the client will need to reconnect to LVS.
If messages are consumed more than 90 seconds after they are produced, enable heartbeats on the client and set the heartbeat timeout to shorter than 90 seconds.
Configuring Heartbeats on a Client
- Java client
Before creating a connection, configure the ConnectionFactory#setRequestedHeartbeat parameter. Example:
ConnectionFactory cf = new ConnectionFactory(); // The heartbeat timeout is 60 seconds. cf.setRequestedHeartbeat(60);
- .NET client
var cf = new ConnectionFactory(); // The heartbeat timeout is 60 seconds. cf.RequestedHeartbeat = TimeSpan.FromSeconds(60);
- Python Pika
// The heartbeat is 60 seconds. params = pika.ConnectionParameters(host='host', heartbeat=60, credentials=pika.PlainCredentials('username', 'passwd')) connection = pika.BlockingConnection(params) while True: channel.basic_publish(exchange='', routing_key='hello', body='Hello World!') print(" [x] Sent 'Hello World!'") # The producer needs to use connection.sleep() to trigger a heartbeat. time.sleep() cannot trigger heartbeats. connection.sleep(200)
- PHP client
// The heartbeat is 60 seconds. $connection = new AMQPStreamConnection(RMQ_HOST, RMQ_PORT, RMQ_USER, RMQ_PASS, RMQ_vhost, ['heartbeat'=> 60]);
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