Specifications

RabbitMQ Instance Specifications

RabbitMQ instances are compatible with RabbitMQ 3.8.35. Table 1 lists the specifications of single-node and cluster RabbitMQ instances.

**Table 1** Specifications of cluster RabbitMQ instances
Flavor	Brokers	Storage Space (GB)	Reference TPS	Maximum Consumers per Broker	Recommended Queues per Broker	Maximum Connections per Broker
rabbitmq.2u4g.cluster	3	300–90,000	3000	4000	100	1000
	5	500–150,000	5000	4000	100	1000
	7	700–210,000	7000	4000	100	1000
rabbitmq.4u8g.cluster	3	300–90,000	6000	8000	200	2000
	5	500–150,000	10,000	8000	200	2000
	7	700–210,000	14,000	8000	200	2000
rabbitmq.8u16g.cluster	3	300–90,000	12,000	16,000	400	4000
	5	500–150,000	20,000	16,000	400	4000
	7	700–210,000	28,000	16,000	400	4000
rabbitmq.12u24g.cluster	3	300–90,000	24,000	24,000	600	6000
	5	500–150,000	40,000	24,000	600	6000
	7	700–210,000	56,000	24,000	600	6000
rabbitmq.16u32g.cluster	3	300–90,000	48,000	32,000	800	8000
	5	500–150,000	80,000	32,000	800	8000
	7	700–210,000	112,000	32,000	800	8000
rabbitmq.24u48g.cluster	3	300–90,000	60,000	40,000	1000	10,000
	5	500–150,000	100,000	40,000	1000	10,000
	7	700–210,000	140,000	40,000	1000	10,000
rabbitmq.32u64g.cluster	3	300–90,000	72,000	40,000	1000	10,000
	5	500–150,000	120,000	40,000	1000	10,000
	7	700–210,000	168,000	40,000	1000	10,000

To ensure stability, the maximum size of a single message is 50 MB. Do not send a message larger than 50 MB.
In the preceding tables, TPS (of production and consumption) is represented by the number of messages (2 KB each) processed per second. In the tests, persistence and queue mirroring were not enabled. Messages were retrieved immediately after creation and were not accumulated in the queues. The data is for reference only and may differ from that in your production environment.
Performance is related to the queue quantity, message accumulation, number of connections, number of channels, number of consumers, queue mirroring, priority queue, message persistence, and the exchange type. Select instance specifications based on the pressure test result of the service model.
A maximum of 2047 channels can be opened on a connection.
Single-node instances can be used for testing. Do not use them for message production. Single-node flavors are not yet available.

Mapping Between Old and New Flavors

Old and new RabbitMQ instance flavors are compared as follows.

**Table 2** Mapping between old and new RabbitMQ instance flavors
Old Flavor		New Flavor
Flavor	Reference TPS	Flavor	Reference TPS
4 vCPUs \| 8 GB × 3	3000	rabbitmq.4u8g.cluster * 3	6000
8 vCPUs \| 16 GB × 3	6000	rabbitmq.8u16g.cluster * 3	12,000
16 vCPUs \| 32 GB × 3	24,000	rabbitmq.16u32g.cluster * 3	48,000

Instances with new flavors have the following features:

New flavors provide better performance at the same price.
Old flavors use non-exclusive resources. If the load is heavy, resources conflicts will occur. By contrast, new flavors use exclusive resources so they provide better performance and stability.
New flavors support scale-out and scale-up to satisfy service changes.
Larger flavors up to rabbitmq.32u64g.cluster are available now.

Storage Space Selection

In cluster mode, RabbitMQ persists messages to disk. When creating a RabbitMQ instance, select a proper storage space size based on the estimated message size and the number of replicas in a mirrored queue, which can be maximally equal to the number of brokers in the cluster.

For example, if the estimated message size is 100 GB, the disk capacity must be at least: 100 GB x Number of mirrored replicas + 100 GB (reserved).

For single-node instances, select a storage space size based on the estimated message size and the reserved disk space.

You can change the number of brokers in a cluster, but cannot change the specifications of a single-node instance.

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