AWS SDK Version 3 for .NET
API Reference

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RunJobFlow creates and starts running a new cluster (job flow). The cluster runs the steps specified. After the steps complete, the cluster stops 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 cluster transitions to the WAITING state rather than shutting down after the steps have completed.

For additional protection, you can set the JobFlowInstancesConfig TerminationProtected parameter to TRUE to lock the cluster 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 cluster 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, see Add More than 256 Steps to a Cluster in the Amazon EMR Management Guide.

For long running clusters, we recommend that you periodically store your results.

The instance fleets configuration is available only in Amazon EMR versions 4.8.0 and later, excluding 5.0.x versions. The RunJobFlow request can contain InstanceFleets parameters or InstanceGroups parameters, but not both.


For .NET Core and PCL this operation is only available in asynchronous form. Please refer to RunJobFlowAsync.

Namespace: Amazon.ElasticMapReduce
Assembly: AWSSDK.ElasticMapReduce.dll
Version: 3.x.y.z


public virtual RunJobFlowResponse RunJobFlow(
         RunJobFlowRequest request
Type: Amazon.ElasticMapReduce.Model.RunJobFlowRequest

Container for the necessary parameters to execute the RunJobFlow service method.

Return Value
The response from the RunJobFlow service method, as returned by ElasticMapReduce.


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

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5

Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms

See Also