AWS SDK Version 2 for .NET
API Reference

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.NET Framework 3.5
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 JobFlowInstancesConfigKeepJobFlowAliveWhenNoSteps 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 JobFlowInstancesConfigTerminationProtected 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.

Namespace: Amazon.ElasticMapReduce
Assembly: AWSSDK.dll
Version: (assembly version)


public abstract RunJobFlowResponse RunJobFlow(
         RunJobFlowRequest request


Type: Amazon.ElasticMapReduce.Model.RunJobFlowRequest

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

Return Value
Type: Amazon.ElasticMapReduce.Model.RunJobFlowResponse
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