Failing over Nodes

Nodes are failed over via hard failover via the POST /controller/failOver HTTP method and URI.

HTTP method and URI

Failing over a node indicates that the node is no longer available in a cluster and replicated data on another node should be made available to clients. This endpoint along with the otpNode parameter (internal node name) fails over a specific node.

POST /controller/failOver

Syntax

HTTP request syntax:

POST /controller/failOver HTTP/1.1
Authorization: Basic

Curl request syntax:

curl -v -X POST
-u admin:password http://localhost:port/controller/failOver -d otpNode=[node@hostname]

Example

The following examples fails over server node 10.3.3.63 from a cluster with the local host, 10.5.2.54.

curl -v -X POST \
  -u Administrator:password http://10.5.2.54:8091/controller/failOver \
  -d 'otpNode=ns_2@10.3.3.63'

Response codes

Response codes	Description
200	OK
400	Bad Request JSON: The RAM Quota value is too small.
401	Unauthorized

The following example is a successful response:

HTTP/1.1 200 OK

The following example is an unsuccessful response, for example, if the node does not exist in the cluster.

HTTP/1.1 400