SwitchInstanceHA-阿里云帮助中心

Operation description

Note

For more information about proximity-based application connections in multi-zone scenarios, see Scenario examples.

When you call this operation, the instance must be of the high-availability or dual-replica type.

Calling this operation has the following impacts:

After the node role switchover is triggered, the data node being switched enters a read-only state for a few seconds and connections are momentarily interrupted. Make sure that your application has a reconnection mechanism.
While the instance is in the switching state, you cannot perform instance-level operations, such as configuration changes and zone migration.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

kvstore:SwitchInstanceHA

update

*All Resource

*

None

Request parameters

Parameter	Type	Required	Description	Example
InstanceId	string	Yes	The instance ID. You can call DescribeInstances to obtain the instance ID.	r-bp1zxszhcgatnx****
NodeId	string	No	The ID of the data shard node. You can call DescribeRoleZoneInfo to obtain the CustinsId parameter. Separate multiple data shard node IDs with commas (,). To specify all nodes, enter `all`. Note This parameter is available and required only when the instance uses a cluster or read/write splitting architecture.	56**19,56**20
SwitchMode	integer	No	The time when to execute the switchover. Valid values: 0: immediately executes the switchover. This is the default value. 1: executes the switchover during the maintenance window. Note You can call ModifyInstanceMaintainTime to modify the maintenance window of the instance.	0
SwitchType	string	No	The switchover mode. Valid values: ReliabilityPriority (default): prioritizes reliability. The primary/secondary switchover is performed only when the data synchronization between the primary and secondary nodes has zero latency. This ensures zero data loss. In scenarios where the write volume is high and persistent synchronization latency exists, this mode may cause the primary/secondary switchover to fail. AvailablePriority: prioritizes availability. The primary/secondary switchover is performed immediately regardless of the synchronization latency between the primary and secondary nodes. A small amount of data may be lost. Note You need to evaluate the requirements for data and services in your business scenario before you select a switchover mode. Valid values: AvailablePriority : AvailablePriority ReliabilityPriority : ReliabilityPriority	ReliabilityPriority

Response elements

Element	Type	Description	Example
	object
RequestId	string	The request ID.	5D622714-AEDD-4609-9167-F5DDD3D1****
TaskId	string		674546459

Examples

Success response

JSON format

{
  "RequestId": "5D622714-AEDD-4609-9167-F5DDD3D1****",
  "TaskId": "674546459"
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.