Reconfiguration Overview
Last Updated：2021-12-20
The cloud database DocDB for MongoDB offers the instance reconfiguration feature, and the business party can expand the instance according to application requirements.
For detailed instance specifications, refer to Instance Specifications.
Replica Cluster Instance
| Change Items | Whether to support change | Description |
|---|---|---|
| CPU specification | Support | For details, refer to Modified Replica Cluster Instance |
| Memory specification | Support | For details, refer to Modified Replica Cluster Instance |
| Memory specification | Support | For details, refer to Modified Replica Cluster Instance Currently, the instance does not support the downgrading of the storage specifications. |
| Instances Architecture | Not support | You cannot change the instance architecture/storage version of the replica set instance, but can do so by creating a new instance. 1. Create an instance and select the required instance architecture/storage version during the instance creation. 2. Use DTS to migrate the data of the original instance to the new instance. 3. Test and verify the new instance. If there is no problem, switch the business to the new instance. 4. If you do not need the original instance any longer, you can release it manually. |
| Storage Version | Not support | The same as above |
| Storage Engine | Not support | The current storage engine only supports value WiredTiger. |
Sharded Cluster Instance
For the shard set instance, you can change the instance configuration by adding nodes and changing the node configuration. For details, refer to the Reconfigure Sharded Cluster Instance.
| Component Name | Change Items | Whether to Support Change | Description |
|---|---|---|---|
| Mongos Node | CPU/Memory Specification | Yes | Support the change in the CPU/memory specifications of Mongos nodes. Support the upgrading/downgrading. |
| Shard Node | CPU/Memory Specification | Yes | You can change the CPU/memory specifications of the Shard nodes. Support the upgrading/downgrading. |
| Memory specification | Yes | Support the change in the Shard node storage specification. You can only upgrade the storage specifications but cannot degrade them. | |
| ConfigServer | CPU/Memory/Memory specificaton | No | ConfigServer adopts a three-node replica cluster architecture with a 1-core and 2GB specification and 20GB storage space. It does not support the reconfiguration. |