This topic describes the specifications of read/write splitting instances of ApsaraDB for Redis Community Edition. These specifications include the memory capacity, maximum number of concurrent connections to each instance, maximum bandwidth, and QPS reference value.

Instance specifications

Instance type InstanceClass (API operation) Number of read replicas Bandwidth (MB/s) Maximum number of new connections per second Maximum number of concurrent connections QPS reference value
1 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.small.1db.1rodb.4proxy.default 1 192 20000 20000 200000
1 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.small.1db.3rodb.4proxy.default 3 384 40000 40000 400000
1 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.small.1db.5rodb.6proxy.default 5 576 50000 60000 600000
2 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.mid.1db.1rodb.4proxy.default 1 192 20000 20000 200000
2 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.mid.1db.3rodb.4proxy.default 3 384 40000 40000 400000
2 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.mid.1db.5rodb.6proxy.default 5 576 50000 60000 600000
4 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.stand.1db.1rodb.4proxy.default 1 192 20000 20000 200000
4 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.stand.1db.3rodb.4proxy.default 3 384 40000 40000 400000
4 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.stand.1db.5rodb.6proxy.default 5 576 50000 60000 600000
8 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.large.1db.1rodb.4proxy.default 1 192 20000 20000 200000
8 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.large.1db.3rodb.4proxy.default 3 384 40000 40000 400000
8 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.large.1db.5rodb.6proxy.default 5 576 50000 60000 600000
16 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.2xlarge.1db.1rodb.4proxy.default 1 192 20000 20000 200000
16 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.2xlarge.1db.3rodb.4proxy.default 3 384 40000 40000 400000
16 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.2xlarge.1db.5rodb.6proxy.default 5 576 50000 60000 600000
32 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.4xlarge.1db.1rodb.4proxy.default 1 192 20000 20000 200000
32 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.4xlarge.1db.3rodb.4proxy.default 3 384 40000 40000 400000
32 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.4xlarge.1db.5rodb.6proxy.default 5 576 50000 60000 600000
64 GB read/write splitting instance (1 primary node, 1 read replica) redis.logic.splitrw.8xlarge.1db.1rodb.4proxy.default 1 192 20000 20000 200000
64 GB read/write splitting instance (1 primary node, 3 read replicas) redis.logic.splitrw.8xlarge.1db.3rodb.4proxy.default 3 384 40000 40000 400000
64 GB read/write splitting instance (1 primary node, 5 read replicas) redis.logic.splitrw.8xlarge.1db.5rodb.6proxy.default 5 576 50000 60000 600000

Calculation rules for bandwidths

  • If network resources are sufficient, the bandwidth is unlimited. However, if network resources are insufficient, the maximum internal bandwidth is limited.
  • The bandwidth value in the table is the bandwidth of the instance. It is the sum of the bandwidth of all shards or nodes on the instance.
  • The upper limit of the total bandwidth for a read/write splitting instance (as shown in the table) is 2,048 MB/s. After the upper limit is reached, the bandwidth cannot be increased even if the number of shards or nodes is increased.
  • The bandwidth separately applies to the upstream bandwidth and downstream bandwidth. If the bandwidth of an instance is 10 MB/s, the upstream and downstream bandwidth of the instance are both 10 MB/s.
  • The bandwidth listed in the table is the internal bandwidth of the ApsaraDB for Redis instance. The Internet bandwidth depends on the internal bandwidth and is limited by the bandwidth of each connection between the instance and a client. We recommend that you connect to the instance over an internal network to maximize the performance.

Calculation rules for connections

  • The following example shows the maximum number of new connections that can be added per second: The maximum number of new connections per second of an instance is 10,000. The maximum number of connections is 50,000. The actual number of connections at the Nth second after the instance starts to run is 12,000. Then, at the (N+1)th second, the number of connections is 22,000 (12,000 + 10,000).
  • The maximum number of new connections per second and the maximum number of connections are the sum of the corresponding values of all shards or nodes on the instance. After 500,000 is reached, the maximum number of connections cannot be increased even if the number of shards or nodes is increased.