what are the limits of apsaramq for rabbitmq - ApsaraMQ for RabbitMQ

ApsaraMQ for RabbitMQ has limits on clusters, characters, and peak transactions per second (TPS) traffic. Do not exceed these limits when you use ApsaraMQ for RabbitMQ. Exceeding these limits may cause program exceptions.

Cluster Limits

Limitations	Serverless Instances		Upfront Instance Series
	Shared	Exclusive	Enterprise Edition	Platinum Edition	Professional Edition
	Reserved + Elastic / Payment by Cumulative Usage	Reserved + Elasticity	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	Maximum connections: 10,000.	Maximum connections: 20,000.	Purchase by configuration. Each instance includes a free quota of 2,000 connections. The maximum number of connections per instance is 10,000.	You can purchase by instance type. A single instance has a free quota of 50,000 and a maximum of 100,000 connections.	Four times the number of queues. A single instance supports between 1000 and 5000 connections.
Number of Queues bound to an Exchange	256	256 You can submit a ticket to request customization. After customization, the instance cannot be downgraded to a shared cluster.	256	256 For custom requirements, contact Alibaba Cloud technical support.	256
Number of Consumers per Queue	Equal to the number of queues multiplied by 4. A single queue supports 800 to 5,000 consumers.	None	Equal to the number of queues multiplied by 4. A single queue supports 800 to 5,000 consumers.	None	Equal to the number of queues multiplied by 4. A single Queue supports 50 to 5,000 Consumers.
Number of Channels per Connection	2,000	3,000	The number of channels per connection ranges from Min[number of queues, 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 greater than or equal to 2,048, 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 less than or equal to 64, the number of channels per connection is 64. If the number of queues is greater than 64, the number of channels per connection equals 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 You can submit a ticket for customization requests. After customization, the instance cannot be downgraded to a shared cluster.	7 days	7 days For custom requirements, 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 period	Maximum value: 3 hours. Default value: 5 minutes	Maximum value: 12 hours Default value: 30 minutes	Maximum value: 3 hours Default value: 5 minutes	Maximum value: 12 hours. Default value: 30 minutes	Maximum value: 10 minutes Default value: 1 minute

Character Limits

Limitations	Limit
Queue name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Length: 1 to 255 characters.
Exchange name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Length: 1 to 255 characters.
Vhost name	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Length: 1 to 255 characters.
Binding Key	Standard type Can contain only letters, digits, hyphens (-), underscores (_), periods (.), forward slashes (/), and at signs (@). Length: 1 to 255 characters. Topic type Can contain only letters, digits, hyphens (-), underscores (_), asterisks (), periods (.), number signs (#), forward slashes (/), and at signs (@). Length: 1 to 255 characters. Cannot start or end with a period (.). If a number sign (#) or an asterisk () starts a key, a period (.) must follow it. If a number sign (#) or an asterisk () ends a key, a period (.) must precede it. If a number sign (#) or an asterisk () appears in the middle of a key, a period (.) must precede and follow it.
Consumer Tag	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), and at signs (@). Length: 1 to 255 characters.
Message ID	Can contain only letters, digits, hyphens (-), underscores (_), periods (.), number signs (#), forward slashes (/), at signs (@), and colons (:). Length: 1 to 255 characters.

Throttling Thresholds

Important

For more information about TPS counting rules, see TPS counting rules for Serverless instances and TPS counting rules for subscription instances.
For solutions to TPS rate limiting, see Solutions to total instance TPS rate limiting and Solutions to single-node TPS rate limiting.

Instance Total TPS Throttling Thresholds

Instance Type	Serverless Instances		Subscription Instances
Specification	Shared	Exclusive	Elastic TPS Disabled			Elastic TPS Enabled
Specification	Reserved + Elastic / By Cumulative Usage	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition	Enterprise Edition	Platinum Edition	Professional Edition
Throttling threshold	Maximum: 50,000 TPS	2 × the peak TPS of the basic specification	Peak TPS of the basic specification			2 × the peak TPS of the basic specification, with a maximum of 50,000 TPS	2 × the peak TPS of the basic specification, with a maximum of 50,000 TPS	1.5 × the peak TPS of the basic specification

Single-Node SendMessage TPS Throttling Thresholds

The server-side limits the SendMessage TPS for each backend service node at the instance level. The throttling thresholds are as follows:

Limit	Serverless Instances			Subscription Instances
	Shared		Exclusive	Enterprise Edition	Platinum Edition	Professional Edition
	By Cumulative Amount	Reserved + Elastic	Reserved + Elastic
Throttling threshold	25,000 TPS	25,000 TPS	None	25,000 TPS	None	25,000 TPS

API Operation Throttling Thresholds

Limitations	Limits API	Serverless Instances		Subscription Instances
		Shared	Exclusive	Enterprise Edition	Platinum Edition	Professional Edition
		Reserved + Pay-as-you-go / Cumulative Usage-Based	Reserved + Elastic	Enterprise Edition	Platinum Edition	Professional Edition
Clear a queue on an instance	`purgeQueue`	500 TPS			None	500 TPS
Creating an Exchange for a Single Instance	`exchangeDeclare`	500 TPS			None	500 TPS
Delete an Exchange on an instance	`exchangeDelete`	500 TPS			None	500 TPS
Create a Queue on an instance	`queueDeclare`	500 TPS			None	500 TPS
Delete a Queue on an instance	`queueDelete`	500 TPS			None	500 TPS
Create a Binding on an instance	`queueBind`	500 TPS			None	500 TPS
Delete a Binding on an instance	`queueUnbind`	500 TPS			None	500 TPS
Single-instance message recovery	`basicRecover`	500 TPS			None	500 TPS
Reentry Queue Message for a Single Instance	`basicReject(requeue=true)` `basicNack(requeue=true)`	20 TPS			None	20 TPS