Limits of ApsaraMQ for RabbitMQ - ApsaraMQ for RabbitMQ - Alibaba Cloud Documentation Center

ApsaraMQ for RabbitMQ has limits on clusters, characters, and peak transactions per second (TPS). When you use ApsaraMQ for RabbitMQ, ensure that you operate within these limits to prevent program errors.

Cluster limits

Limit	Serverless instances		Subscription instances
	Shared	Dedicated	Enterprise Edition	Platinum Edition	Professional Edition
	Reserved + Elastic/Pay-by-traffic	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition
Vhosts per instance	200	2,000	200	4,096	200
Exchanges per instance	6,000	10,000	6,000	80,000	6,000
Bindings per instance	20,000	20,000	20,000	None	20,000
Queues per instance	6,000	10,000	6,000	80,000	6,000
Connections per instance	Maximum connections: 10,000.	Maximum connections: 20,000.	Purchase based on the instance type. Each instance has a free quota of 2,000 connections. The maximum number of connections is 10,000.	Purchase based on the instance type. Each instance has a free quota of 50,000 connections. The maximum number of connections is 100,000.	Number of queues × 4. The number of connections per instance ranges from 1,000 to 5,000.
Queues per exchange	256	256 Submit a ticket to request a custom quota. After the quota is customized, you cannot downgrade the instance to a shared cluster.	256	256 To request a custom quota, contact Alibaba Cloud technical support.	256
Consumers per queue	Number of queues × 4. The number of consumers per queue ranges from 800 to 5,000.	None	Number of queues × 4. The number of consumers per queue ranges from 800 to 5,000.	No limit	Number of queues × 4. The number of consumers per queue ranges from 50 to 5,000.
Channels per connection	2,000	3,000	The number of channels per connection is the minimum of the number of queues and 2,048. If the number of queues is less than 2,048, the channel limit is the number of queues. If the number of queues is 2,048 or more, the channel limit is 2,048.	3,000	The number of channels per connection is 64 or the number of queues. If the number of queues is 64 or less, the number of channels per connection is 64. If the number of queues is greater than 64, the number of channels per connection is the number of queues.
Message size	10 MB	10 MB	10 MB	50 MB	64 KB
Maximum delay for delayed messages	7 days	7 days Submit a ticket to request a custom quota. After the quota is customized, you cannot downgrade the instance to a shared cluster.	7 days	7 days To request a custom quota, contact Alibaba Cloud technical support.	24 hours
Maximum message retention period	3 days	3 days	3 days	3 days	3 days
Maximum deliveries	16	16	16	64	16
Consumption timeout	Maximum: 3 hours Default: 5 minutes	Maximum: 12 hours Default: 30 minutes	Maximum: 3 hours Default: 5 minutes	Maximum: 12 hours Default: 30 minutes	Maximum: 10 minutes Default: 1 minute

Character limits

Limitations	Limit
Queue name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). The length must be 1 to 255 characters.
Exchange name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). The length must be 1 to 255 characters.
Vhost name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). The length must be 1 to 255 characters.
Binding key	Standard category Can contain only letters, digits, hyphens (-), underscores (_), periods (.), forward slashes (/), and at signs (@). The length must be 1 to 255 characters. Topic category Can contain only letters, digits, hyphens (-), underscores (_), asterisks (), periods (.), number signs (#), forward slashes (/), and at signs (@). The length must be 1 to 255 characters. The key cannot start or end with a period (.). If the key starts with a number sign (#) or an asterisk (), it must be followed by a period (.). If the key ends with a number sign (#) or an asterisk (), it must be preceded by a period (.). If a number sign (#) or an asterisk () is in the middle of the key, it must be enclosed by periods (.).
Consumer tag	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). The length must be 1 to 255 characters.
Message ID	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). The length must be 1 to 255 characters.

Throttling thresholds

Important

For information about how TPS is calculated, see Serverless instance calculation rules and Subscription instance TPS calculation rules.
For solutions to TPS throttling, see Solutions for when the total TPS of an instance is throttled and Solutions for when the TPS of a single node is throttled.

Total instance TPS throttling threshold

Instance series	Serverless instances		Subscription instances
Edition	Shared	Dedicated	Elastic TPS disabled			Elastic TPS enabled
Edition	Reserved + Elastic/Pay-by-traffic	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition	Enterprise Edition	Platinum Edition	Professional Edition
Throttling threshold	Up to 50,000 TPS	Twice the peak TPS of the basic instance type	The peak TPS of the basic instance type			Twice the peak TPS of the basic instance type, up to 50,000 TPS	Twice the peak TPS of the basic instance type, up to 50,000 TPS	1.5 times the peak TPS of the basic instance type

Single-node SendMessage TPS throttling threshold

The server limits the SendMessage TPS for each backend service node within an instance. The throttling thresholds are as follows:

Limit	Serverless instances			Subscription instances
	Shared		Dedicated	Enterprise Edition	Platinum Edition	Professional Edition
	Cumulative amount	Reserved + Elastic	Reserved + Elastic
Throttling threshold	25,000 TPS	25,000 TPS	None	25,000 TPS	None	25,000 TPS

Single-API throttling thresholds

Limitations	Limit Management Interface	Serverless instances		Subscription instances
		Shared	Dedicated	Enterprise Edition	Platinum Edition	Professional Edition
		Reserved + Elastic/Pay-by-traffic	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition
Purge queues for a single instance	`purgeQueue`	500 TPS			None	500 TPS
Create an exchange for a single instance	`exchangeDeclare`	500 TPS			None	500 TPS
Delete an exchange for a single instance	`exchangeDelete`	500 TPS			None	500 TPS
Create a queue for a single instance	`queueDeclare`	500 TPS			None	500 TPS
Delete a queue for a single instance	`queueDelete`	500 TPS			None	500 TPS
Create a binding for a single instance	`queueBind`	500 TPS			None	500 TPS
Delete a binding for a single instance	`queueUnbind`	500 TPS			None	500 TPS
Recover messages for a single instance	`basicRecover`	500 TPS			None	500 TPS
Requeue messages for a single instance	`basicReject(requeue=true)` `basicNack(requeue=true)`	20 TPS			None	20 TPS