This topic describes the specifications of read/write splitting cluster 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 for these instances.

Instance specifications

Instance type InstanceClass (API operation) Number of shards Number of read replicas per shard Bandwidth (MB/s) Maximum number of new connections per second Maximum number of concurrent connections QPS reference value
4 GB read/write splitting instance (2 primary nodes, 1 read replica) redis.logic.splitrw.sharding2g.2db.1rodb.4proxy.default 2 1 384 50000 40000 400000
8 GB read/write splitting instance (2 primary nodes, 1 read replica) redis.logic.splitrw.sharding4g.2db.1rodb.4proxy.default 2 1 384 50000 40000 400000
16 GB read/write splitting instance (2 primary nodes, 1 read replica) redis.logic.splitrw.sharding8g.2db.1rodb.8proxy.default 2 1 384 50000 40000 400000
32 GB read/write splitting instance (8 primary nodes, 1 read replica) redis.logic.splitrw.sharding4g.8db.1rodb.16proxy.default 8 1 1536 50000 160000 1600000
64 GB read/write splitting instance (16 primary nodes, 1 read replica) redis.logic.splitrw.sharding4g.16db.1rodb.32proxy.default 16 1 2048 50000 320000 3200000
128 GB read/write splitting instance (16 primary nodes, 1 read replica) redis.logic.splitrw.sharding8g.16db.1rodb.32proxy.default 16 1 2048 50000 320000 3200000
256 GB read/write splitting instance (32 primary nodes, 1 read replica) redis.logic.splitrw.sharding8g.32db.1rodb.64proxy.default 32 1 2048 50000 500000 6400000
512 GB read/write splitting instance (32 primary nodes, 1 read replica) redis.logic.splitrw.sharding16g.32db.1rodb.64proxy.default 32 1 2048 50000 500000 6400000

Bandwidth calculation rules

  • If network resources are sufficient, Apsaradb for Redis instances do not have bandwidth limits. However, if network resources are insufficient, the limits in the above table take effect.
  • The bandwidth value in the table represents the bandwidth of the instance, that is, the total bandwidth of all shards or nodes in the instance.
  • The maximum bandwidth of an instance (including all shards or nodes) is 2,048 MB. Bandwidth does not increase even if the number of shards or nodes increases.
  • The bandwidth applies to the upstream bandwidth and the downstream bandwidth respectively. 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 in the table is the internal bandwidth of the Redis instance. The Internet bandwidth is determined by the internal bandwidth and is limited by the bandwidth of the connection between the Redis instance and the client. We recommend that you connect to the instance over an internal network to maximize its performance.

Connection number calculation rules

  • The following example explains the maximum number of new connections per second: If the maximum number of new connections per second of an instance is 10000, the actual number of concurrent connections at the Nth second after the instance starts to run is 12000, at the (N+1)th second, the actual number of concurrent connections is 22000, then the number of new connections within that second is 22000-12000=10000, which is not greater than the maximum number of new connections per second.
  • The maximum number of new connections per second and the maximum number of concorrent connections are the sum of the corresponding values of all shards or nodes in the instance. After 500000 is reached, the maximum number of concorrent connections is not increased even if the number of shards or nodes is increased.

FAQ

Q: How can I create a read/write splitting cluster instance in the console?

A: To create a read/write splitting cluster instance in the console, follow these steps:
  1. Log on to the ApsaraDB for Redis console. In the left-side navigation pane, click Instances, and click Create Instance. On the buy page that appears, set Architecture Type to Cluster Edition.
  2. Set Shards to the number of shards on the read-write splitting instance.
  3. Select Master-Replica from the Node Type drop-down list.
  4. Select the specifications from the Instance Class drop-down list.