Request Syntax Request Parameters Response Elements Errors Examples See Also

ModifyInstanceGroups

ModifyInstanceGroups modifies the number of nodes and configuration settings of an instance group. The input parameters include the new target instance count for the group and the instance group ID. The call will either succeed or fail atomically.

Request Syntax


{
   "ClusterId": "string",
   "InstanceGroups": [ 
      { 
         "Configurations": [ 
            { 
               "Classification": "string",
               "Configurations": [ 
                  "Configuration"
               ],
               "Properties": { 
                  "string" : "string" 
               }
            }
         ],
         "EC2InstanceIdsToTerminate": [ "string" ],
         "InstanceCount": number,
         "InstanceGroupId": "string",
         "ReconfigurationType": "string",
         "ShrinkPolicy": { 
            "DecommissionTimeout": number,
            "InstanceResizePolicy": { 
               "InstancesToProtect": [ "string" ],
               "InstancesToTerminate": [ "string" ],
               "InstanceTerminationTimeout": number
            }
         }
      }
   ]
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

ClusterId

The ID of the cluster to which the instance group belongs.

Type: String

Required: No

InstanceGroups

Instance groups to change.

Type: Array of InstanceGroupModifyConfig objects

Required: No

Response Elements

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

Errors

For information about the errors that are common to all actions, see Common Errors.

InternalServerError

Indicates that an error occurred while processing the request and that the request was not completed.

HTTP Status Code: 400

Examples

Example

This example illustrates one usage of ModifyInstanceGroups.

Sample Request


POST / HTTP/1.1
Content-Type: application/x-amz-json-1.1
X-Amz-Target: ElasticMapReduce.ModifyInstanceGroups
Content-Length: 77
User-Agent: aws-sdk-ruby/1.9.2 ruby/1.9.3 i386-mingw32
Host: us-east-1.elasticmapreduce.amazonaws.com
X-Amz-Date: 20130716T205843Z
X-Amz-Content-Sha256: bb1af3d0c6c6a1a09f21ccd7f04a0e2e6c9ce5b5810b0f6777560fe4f81bda8c
Authorization: AWS4-HMAC-SHA256 Credential=AKIAIOSFODNN7EXAMPLE/20130716/us-east-1/elasticmapreduce/aws4_request, SignedHeaders=content-length;content-type;host;user-agent;x-amz-content-sha256;x-amz-date;x-amz-target, Signature=17bbbb4448a1f47a14d5657445e9de5cadf16bed58b850585f80865882133b33
Accept: */*

{"InstanceGroups": [{
    "InstanceGroupId": "ig-1S8NWT31S2OVG",
    "InstanceCount": 5
}]}

Sample Response


HTTP/1.1 200 OK
x-amzn-RequestId: 80a74808-ee5a-11e2-90db-69a5154aeb8d
Content-Type: application/x-amz-json-1.1
Content-Length: 0
Date: Tue, 16 Jul 2013 20:58:44 GMT