This topic describes the specifications of master-replica cluster instances of ApsaraDB for Redis Community Edition. These specifications include the memory capacity, maximum number of connections to each instance, maximum bandwidth, and queries per second (QPS) reference value.

Instance types

Instance type InstanceClass value (used in API operations) Number of CPU cores Number of shards Maximum number of new connections per second Maximum number of connections ( Direct connection mode ) Maximum number of connections ( Proxy mode ) Maximum bandwidth (MB/s) QPS reference value
2 GB cluster instance (2 shards) redis.logic.sharding.1g.2db.0rodb.4proxy.default 4 2 20,000 20,000 480,000 96 200,000
4 GB cluster instance (2 shards) redis.logic.sharding.2g.2db.0rodb.4proxy.default 4 2 20,000 20,000 480,000 192 200,000
8 GB cluster instance (2 shards) redis.logic.sharding.4g.2db.0rodb.4proxy.default 4 2 20,000 20,000 480,000 192 200,000
16 GB cluster instance (2 shards) redis.logic.sharding.8g.2db.0rodb.4proxy.default 4 2 20,000 20,000 480,000 192 200,000
32 GB cluster instance (2 shards) redis.logic.sharding.16g.2db.0rodb.4proxy.default 4 2 20,000 20,000 480,000 192 200,000
4 GB cluster instance (4 shards) redis.logic.sharding.1g.4db.0rodb.4proxy.default 8 4 40,000 40,000 480,000 192 400,000
8 GB cluster instance (4 shards) redis.logic.sharding.2g.4db.0rodb.4proxy.default 8 4 40,000 40,000 480,000 384 400,000
16 GB cluster instance (4 shards) redis.logic.sharding.4g.4db.0rodb.4proxy.default 8 4 40,000 40,000 480,000 384 400,000
24 GB cluster instance (4 shards) redis.logic.sharding.6g.4db.0rodb.4proxy.default 8 4 40,000 40,000 480,000 384 400,000
32 GB cluster instance (4 shards) redis.logic.sharding.8g.4db.0rodb.4proxy.default 8 4 40,000 40,000 480,000 384 400,000
64 GB cluster instance (4 shards) redis.logic.sharding.16g.4db.0rodb.4proxy.default 8 4 40,000 40,000 480,000 384 400,000
128 GB cluster instance (4 shards) redis.logic.sharding.32g.4db.0rodb.8proxy.default 8 4 50,000 80,000 480,000 768 800,000
8 GB cluster instance (8 shards) redis.logic.sharding.1g.8db.0rodb.8proxy.default 16 8 50,000 80,000 500,000 384 800,000
16 GB cluster instance (8 shards) redis.logic.sharding.2g.8db.0rodb.8proxy.default 16 8 50,000 80,000 500,000 768 800,000
32 GB cluster instance (8 shards) redis.logic.sharding.4g.8db.0rodb.8proxy.default 16 8 50,000 80,000 500,000 768 800,000
48 GB cluster instance (8 shards) redis.logic.sharding.6g.8db.0rodb.8proxy.default 16 8 50,000 80,000 500,000 768 800,000
64 GB cluster instance (8 shards) redis.logic.sharding.8g.8db.0rodb.8proxy.default 16 8 50,000 80,000 500,000 768 800,000
128 GB cluster instance (8 shards) redis.logic.sharding.16g.8db.0rodb.8proxy.default 16 8 50,000 80,000 500,000 768 800,000
16 GB cluster instance (16 shards) redis.logic.sharding.1g.16db.0rodb.16proxy.default 32 16 50,000 160,000 500,000 768 1,600,000
32 GB cluster instance (16 shards) redis.logic.sharding.2g.16db.0rodb.16proxy.default 32 16 50,000 160,000 500,000 1,536 1,600,000
64 GB cluster instance (16 shards) redis.logic.sharding.4g.16db.0rodb.16proxy.default 32 16 50,000 160,000 500,000 1,536 1,600,000
96 GB cluster instance (16 shards) redis.logic.sharding.6g.16db.0rodb.16proxy.default 32 16 50,000 160,000 500,000 1,536 1,600,000
128 GB cluster instance (16 shards) redis.logic.sharding.8g.16db.0rodb.16proxy.default 32 16 50,000 160,000 500,000 1,536 1,600,000
256 GB cluster instance (16 shards) redis.logic.sharding.16g.16db.0rodb.16proxy.default 32 16 50,000 160,000 500,000 1,536 1,600,000
64 GB cluster instance (32 shards) redis.logic.sharding.2g.32db.0rodb.32proxy.default 64 32 50,000 320,000 500,000 2,048 3,200,000
128 GB cluster instance (32 shards) redis.logic.sharding.4g.32db.0rodb.32proxy.default 64 32 50,000 320,000 500,000 2,048 3,200,000
192 GB cluster instance (32 shards) redis.logic.sharding.6g.32db.0rodb.32proxy.default 64 32 50,000 320,000 500,000 2,048 3,200,000
256 GB cluster instance (32 shards) redis.logic.sharding.8g.32db.0rodb.32proxy.default 64 32 50,000 320,000 500,000 2,048 3,200,000
320 GB cluster instance (32 shards) redis.logic.sharding.10g.32db.0rodb.32proxy.default 64 32 50,000 320,000 500,000 2,048 3,200,000
512 GB cluster instance (32 shards) redis.logic.sharding.16g.32db.0rodb.32proxy.default 64 32 50,000 320,000 500,000 2,048 3,200,000
128 GB cluster instance (64 shards) redis.logic.sharding.2g.64db.0rodb.64proxy.default 128 64 50,000 640,000 500,000 2,048 6,400,000
256 GB cluster instance (64 shards) redis.logic.sharding.4g.64db.0rodb.64proxy.default 128 64 50,000 640,000 500,000 2,048 6,400,000
512 GB cluster instance (64 shards) redis.logic.sharding.8g.64db.0rodb.64proxy.default 128 64 50,000 640,000 500,000 2,048 6,400,000
512 GB cluster instance (128 shards) redis.logic.sharding.4g.128db.0rodb.128proxy.default 256 128 50,000 1.280,000 500,000 2,048 12,800,000
1,024 GB cluster instance (256 shards) redis.logic.sharding.4g.256db.0rodb.256proxy.default 512 256 50,000 2,560,000 500,000 2,048 25,600,000
2,048 GB cluster instance (256 shards) redis.logic.sharding.8g.256db.0rodb.256proxy.default 512 256 50,000 2,560,000 500,000 2,048 25,600,000
4,096 GB cluster instance (256 shards) redis.logic.sharding.16g.256db.0rodb.256proxy.default 512 256 50,000 2,560,000 500,000 2,048 25,600,000

Notes about CPU cores

To ensure service stability, the system reserves a CPU core to process background tasks. In a cluster instance or a read/write splitting instance, the system reserves a CPU core for each data shard or each read replica to process background tasks.

Calculation rules for bandwidth values

  • The bandwidth value in the preceding table is the bandwidth of the instance. The bandwidth value is the sum of the bandwidths of all shards or nodes in the instance. Each shard has the following bandwidth limits:
    • Community Edition: If the memory of each shard is less than or equal to 1 GB, the maximum bandwidth of each shard is 48 MB/s. If the memory of each shard is greater than 1 GB, the maximum bandwidth of each shard is 96 MB/s.
    • Enhanced Edition (Tair): The maximum bandwidth of each shard is 96 MB/s.
  • If the default proxy endpoint is used by a cluster instance, the upper limit of bandwidth for the cluster instance is 2,048 MB/s. After the upper limit is reached, the bandwidth cannot be increased even if you add more shards to the cluster instance.
    Note To handle network traffic peaks, you can enable the direct connection mode. For more information, see Enable the direct connection mode. The direct connection mode is applicable only to cluster instances. In direct connection mode, the upper limit of the bandwidth is equal to the maximum bandwidth of a single shard multiplied by the number of shards. For example, if a cluster instance contains 128 shards and each shard is allocated with a memory of more than 1 GB, the bandwidth limit is 12,288 MB/s.
  • The bandwidth value applies to the upstream and downstream bandwidths. For example, if the bandwidth of an instance is 10 MB/s, the upstream and downstream bandwidths of the instance are both 10 MB/s.
    Note If your instance has unexpected or scheduled traffic peaks, you can adjust the bandwidth of the instance. For more information, see Adjust the bandwidth of an ApsaraDB for Redis instance.
  • The bandwidth in the preceding table is the internal bandwidth of the ApsaraDB for Redis instance. The public bandwidth is determined by the internal bandwidth and is limited by the bandwidth of the connection between the ApsaraDB for Redis instance and the client. We recommend that you connect to the instance over an internal network to maximize performance.

Calculation rules for connections

Type Description
Maximum number of connections In proxy mode,the maximum number of connections to an instance is 500,000. If the upper limit of 500,000 connections is reached, subsequent connections cannot be established even if you add more shards or nodes.
Number of new connections per second The following example shows how the maximum number of new connections per second affects the maximum number of connections at a specific second: The maximum number of new connections to an instance per second is 10,000. The maximum number of connections to the instance 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 maximum number of connections is 22,000, which is calculated by using the following formula: 12,000 + 10,000.
Note If the instance is connected in direct connection mode, connection performance degrades because proxy nodes are bypassed. For more information about the direct connection mode, see Enable the direct connection mode. The maximum number of new connections per second for a single data shard is 2,000. For example, if an instance has four data shards, the maximum number of new connections per second is 8,000.

FAQ

Q: Why is the actual bandwidth of my instance different from that described in this topic?

A: The bandwidths of specific instance types may be adjusted after the service is upgraded. If the bandwidth of your instance is different from that described in this topic, you can change the configurations of your instance by selecting the same instance type to update the bandwidth. The price for your instance remains unchanged after the configuration change. For more information, see Change the configurations of an instance.