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RunJobFlow
Description
RunJobFlow creates and starts running a new job flow. The job flow will run the steps
specified. Once the job flow completes, the cluster is stopped and the HDFS partition is
lost. To prevent loss of data, configure the last step of the job flow to store results in
Amazon S3. If the JobFlowInstancesConfig
KeepJobFlowAliveWhenNoSteps parameter is
set to TRUE, the job flow will transition to the WAITING state rather than
shutting down once the steps have completed.
For additional protection, you can set the
JobFlowInstancesConfig
TerminationProtected parameter to TRUE to lock the
job flow and prevent it from being
terminated by API call, user intervention, or in the event of a job flow error.
A maximum of 256 steps are allowed in each job flow.
If your job flow is long-running (such as a Hive data warehouse) or complex, you may require more than 256 steps to process your data. You can bypass the 256-step limitation in various ways, including using the SSH shell to connect to the master node and submitting queries directly to the software running on the master node, such as Hive and Hadoop. For more information on how to do this, go to Add More than 256 Steps to a Job Flow in the Amazon Elastic MapReduce Developer's Guide.
For long running job flows, we recommend that you periodically store your results.
Request Parameters
For information about the common parameters that all actions use, see Common Query Parameters.
| Name | Description | Required |
|---|---|---|
AdditionalInfo
|
A JSON string for selecting additional features. Type: String Length constraints: Minimum length of 0. Maximum length of 10280. | No |
AmiVersion
|
The version of the Amazon Machine Image (AMI) to use when launching Amazon EC2 instances in the job flow. The following values ane valid:
If this value is not specified, the job flow uses the default of (AMI 1.0, Hadoop 0.18). If the AMI supports multiple versions of Hadoop (for example, AMI 1.0 supports both Hadoop 0.18 and 0.20) you can use the
JobFlowInstancesConfig
For details about the AMI versions currently supported by Amazon ElasticMapReduce, go to AMI Versions Supported in Elastic MapReduce in the Amazon Elastic MapReduce Developer's Guide. Type: String Length constraints: Minimum length of 0. Maximum length of 256. | No |
BootstrapActions.member.N
|
A list of bootstrap actions that will be run before Hadoop is started on the cluster nodes. Type: BootstrapActionConfig list | No |
Instances
|
A specification of the number and type of Amazon EC2 instances on which to run the job flow. Type: JobFlowInstancesConfig | Yes |
LogUri
|
Specifies the location in Amazon S3 to write the log files of the job flow. If a value is not provided, logs are not created. Type: String Length constraints: Minimum length of 0. Maximum length of 10280. | No |
Name
|
The name of the job flow. Type: String Length constraints: Minimum length of 0. Maximum length of 256. | Yes |
Steps.member.N
|
A list of steps to be executed by the job flow. Type: StepConfig list | No |
SupportedProducts.member.N
|
A list of strings used by third-party software to tag the job flow. Currently the only valid value is "karmasphere-enterprise-utility", which tags the job flow for management by Karmasphere. Type: String list | No |
Response Elements
RunJobFlowResult
structure.
| Name | Description |
|---|---|
JobFlowId
|
An unique identifier for the job flow. Type: String |
Errors
For information about the common errors that all actions use, see Common Errors.
| Error | Description | HTTP Status Code |
|---|---|---|
InternalServerError
|
Indicates that an error occurred while processing the request and that the request was not completed. | 500 |
Examples
Sample Request
https://elasticmapreduce.amazonaws.com?Action=RunJobFlow &Name=MyJobFlowName &LogUri=s3n%3A%2F%2Fmybucket%2Fsubdir &Instances.MasterInstanceType=m1.small &Instances.SlaveInstanceType=m1.small &Instances.InstanceCount=4 &Instances.Ec2KeyName=myec2keyname &Instances.Placement.AvailabilityZone=us-east-1a &Instances.KeepJobFlowAliveWhenNoSteps=true &Instances.TerminationProtected=true &Steps.member.1.Name=MyStepName &Steps.member.1.ActionOnFailure=CONTINUE &Steps.member.1.HadoopJarStep.Jar=MyJarFile &Steps.member.1.HadoopJarStep.MainClass=MyMainClass &Steps.member.1.HadoopJarStep.Args.member.1=arg1 &Steps.member.1.HadoopJarStep.Args.member.2=arg2 &AuthParams
Sample Response
<RunJobFlowResponse xmlns="http://elasticmapreduce.amazonaws.com/doc/2009-03-31">
<RunJobFlowResult>
<JobFlowId>
j-3UN6WX5RRO2AG
</JobFlowId>
</RunJobFlowResult>
<ResponseMetadata>
<RequestId>
8296d8b8-ed85-11dd-9877-6fad448a8419
</RequestId>
</ResponseMetadata>
</RunJobFlowResponse> 
