What are the limits of ApsaraMQ for RabbitMQ - ApsaraMQ for RabbitMQ

ApsaraMQ for RabbitMQ imposes limits on clusters, characters, and peak transactions per second (TPS). To prevent program errors, do not exceed these limits when you use ApsaraMQ for RabbitMQ.

Cluster limits

Limit item	Serverless Edition instances		Subscription Edition instances
	Shared	Dedicated	Enterprise Edition	Platinum Edition	Professional Edition
	Reserved + Elastic/Pay-by-volume	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition
Number of vhosts per instance	200	2,000	200	4,096	200
Number of exchanges per instance	6,000	10,000	6,000	80,000	6,000
Number of bindings per instance	20,000	20,000	20,000	None	20,000
Number of queues per instance	6,000	10,000	6,000	80,000	6,000
Number of connections per instance	The maximum number of connections is 10,000.	The maximum number of connections is 20,000.	Purchased based on the instance type. Each instance has a free quota of 2,000 connections. The maximum number of connections is 10,000.	Purchased 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.
Number of queues bound to a single exchange	256	256 To request customization, submit a ticket. After customization, the instance cannot be downgraded to a shared cluster.	256	256 To request customization, contact Alibaba Cloud technical support.	256
Number of 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.	None	Number of queues × 4. The number of consumers per queue ranges from 50 to 5,000.
Number of channels per connection	2,000	3,000	The number of channels per connection is min(Number of queues, 2048). If the number of queues is less than 2,048, the limit is the number of queues. If the number of Queues is 2048 or more, the maximum number of Channels is 2048.	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 equal to the number of queues.
Message size	10 MB	50 MB	10 MB	50 MB	64 KB
Maximum delay for delayed messages	7 days	7 days To request customization, submit a ticket. After customization, the instance cannot be downgraded to a shared cluster.	7 days	7 days To request customization, contact Alibaba Cloud technical support.	24 hours
Maximum message retention period	3 days	3 days	3 days	3 days	3 days
Maximum delivery attempts	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

Limits	Limit
Queue name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Must be 1 to 255 characters in length.
Exchange name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Must be 1 to 255 characters in length.
Vhost name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Must be 1 to 255 characters in length.
Binding key	Standard category Can contain only letters, digits, hyphens (-), underscores (_), periods (.), forward slashes (/), and at signs (@). Must be 1 to 255 characters in length. Topic category Can contain only letters, digits, hyphens (-), underscores (_), asterisks (), periods (.), number signs (#), forward slashes (/), and at signs (@). Must be 1 to 255 characters in length. 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 (@). Must be 1 to 255 characters in length.
Message ID	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Must be 1 to 255 characters in length.

Throttling thresholds

Important

For more information about TPS calculation rules, see Serverless Edition instance calculation rules and Subscription Edition instance TPS calculation rules.
For more information about how to resolve issues when TPS is throttled, see Solutions for when the total TPS of a single instance is throttled and Solutions for when the TPS of a single node is throttled.

Total instance TPS throttling threshold

Instance edition	Serverless Edition instances		Subscription Instance Series
Specifications	Shared	Dedicated	Elastic TPS disabled			Elastic TPS enabled
Specifications	Reserved + Elastic/Pay-by-volume	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition	Enterprise Edition	Platinum Edition	Professional Edition
Throttling threshold	Up to 50,000 per second	Twice the peak TPS of the base specifications	Peak TPS of the base specifications			Twice the peak TPS of the base specifications, up to 50,000 per second	Twice the peak TPS of the base specifications, up to 50,000 per second	1.5 times the peak TPS of the base specifications

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 Edition instances			Subscription Edition instances
	Shared		Dedicated	Enterprise Edition	Platinum Edition	Professional Edition
	By Cumulative Amount	Reserved + Elastic	Reserved + Elastic
Throttling threshold	25,000 per second	25,000 per second	None	25,000 per second	None	25,000 per second

Throttling thresholds for individual API operations

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