Main Concepts
The following terms are mainly used in the UMem Redis product. To facilitate quick use, the following explanations are provided:
| Term | Definition/Explanation |
|---|---|
| Instance Name | The user-defined name of the UMem Redis instance. |
| Protocol | The UMem Redis instance supports the Redis protocol. |
| Model | The UMem Redis instance is divided into master-replica and distributed versions according to the model. |
| Master-Replica Instance | Refers to the Redis instance with a master-replica architecture. The dual-node master-replica instance supports expansion and contraction, but the expanded capacity and performance are limited. |
| Distributed Instance | Refers to the Redis instance with a scalable shard cluster. The distributed cluster instance has better scalability and performance, but there are also certain limitations in functionality. |
| Resource ID | After the user creates a UMem Redis instance, the system will automatically generate a resource ID, which is globally unique. |
| IP and Port | The IP is the intranet address for users to access the UMem Redis instance, which is automatically generated after the UMem Redis instance is successfully created. The default port is 6379. |
| Expansion | When the configuration of the UMem Redis instance cannot support the business, the UMem Redis instance can be upgraded by expansion. |
| Password | The master-replica version supports password access authentication to further ensure instance security. |
| Configuration Upgrade/Downgrade | The master-replica version supports independent expansion and contraction. |
| Replica | The master-replica version supports the creation of read-only instances. A master-replica Redis instance supports up to 5 read-only replica libraries, which are composed of one master and one replica to ensure the high availability of the read-only replica library. |
| Cross-Availability Zone High Availability | The master-replica version of Redis supports high availability across availability zones, that is, one master and one replica are deployed in different availability zones under the same region to achieve disaster recovery at the availability zone level. |
| Replica Library Availability Zone | The availability zone where the replica library of the master-replica version of Redis is deployed. When the cross-availability zone deployment function is enabled, users can choose to deploy the replica library in other availability zones in the same region. |
| Attribute | Divided into master, replica; the attribute of the master-replica Redis instance is master, and the replica instance of the master-replica Redis is replica. |
| Capacity | The capacity size of the Redis instance created by the user. |
