Scaling #
Definition #
Scaling refers to the system that dynamically expands or shrinks the capacity according to the status of the storage layer nodes, `to ensure that the resource consumption is reduced as much as possible while meeting the business needs of the upper layer.
Related Concepts #
Node #
An instance running a compute or storage layer component process, which can be a physical machine, a virtual machine, a container, and so on.
Cluster #
Multiple nodes that are grouped together to provide a specific service.
Limitations #
Supported Items #
- Integer or string primary key table migration.
Unsupported Items #
- No primary key table migration.
- Composite primary key table migration.
How it works #
If the sharding algorithm and the use method meet the conditions, it can be efficiently scaled and contracted, without the need to move data or only a small amount of data.
Range sharding/scaling-out #
Range sharding/scaling-in #
