Request Syntax Request Parameters Response Elements Errors Examples See Also

SetUnhealthyNodeReplacement

Specify whether to enable unhealthy node replacement, which lets Amazon EMR gracefully replace core nodes on a cluster if any nodes become unhealthy. For example, a node becomes unhealthy if disk usage is above 90%. If unhealthy node replacement is on and TerminationProtected are off, Amazon EMR immediately terminates the unhealthy core nodes. To use unhealthy node replacement and retain unhealthy core nodes, use SetTerminationProtection to turn on termination protection. In such cases, Amazon EMR adds the unhealthy nodes to a denylist, reducing job interruptions and failures.

If unhealthy node replacement is on, Amazon EMR notifies YARN and other applications on the cluster to stop scheduling tasks with these nodes, moves the data, and then terminates the nodes.

For more information, see graceful node replacement in the Amazon EMR Management Guide.

Request Syntax


{
   "JobFlowIds": [ "string" ],
   "UnhealthyNodeReplacement": boolean
}

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.

JobFlowIds

The list of strings that uniquely identify the clusters for which to turn on unhealthy node replacement. You can get these identifiers by running the RunJobFlow or the DescribeJobFlows operations.

Type: Array of strings

Length Constraints: Minimum length of 0. Maximum length of 10280.

Pattern: [\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

Required: Yes

UnhealthyNodeReplacement

Indicates whether to turn on or turn off graceful unhealthy node replacement.

Type: Boolean

Required: Yes

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 SetUnhealthyNodeReplacement.

Sample Request


POST / HTTP/1.1
Content-Type: application/x-amz-json-1.1
X-Amz-Target: ElasticMapReduce.SetUnhealthyNodeReplacement
Content-Length: 61
User-Agent: aws-sdk-ruby/1.9.2 ruby/1.9.3 i386-mingw32
Host: us-east-1.elasticmapreduce.amazonaws.com
X-Amz-Date: 20130716T211420Z
X-Amz-Content-Sha256: c362fadae0fce377aa63f04388aeb90c53cedb17a8bfbb8cffcb10c2378137f9
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=764b6aa1a38733cadff35a2e884887e9f1208a422266bc83ac77e8d0b80bd4cf
Accept: */*
 
{
    "JobFlowIds": ["j-3TS0OIYO4NFN"],
    "SetUnhealthyNodeReplacement": true
}

Sample Response


HTTP/1.1 200 OK
x-amzn-RequestId: af23b1db-ee5c-11e2-9787-192218ecb460
Content-Type: application/x-amz-json-1.1
Content-Length: 0
Date: Tue, 16 Jul 2013 21:14:21 GMT