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.
Declaration Syntax| C# |
public class RunJobFlowRequest : AmazonWebServiceRequest
Members| All Members | Constructors | Methods | Properties | ||
| Icon | Member | Description |
|---|---|---|
 | RunJobFlowRequest()()()() | Initializes a new instance of the RunJobFlowRequest class |
 | AdditionalInfo |
A JSON string for selecting additional features.
Constraints: |
| AmiVersion |
The version of the Amazon Machine Image (AMI) to use when launching Amazon EC2 instances in the job flow. The following values are valid:
Constraints: |
| BootstrapActions |
A list of bootstrap actions that will be run before Hadoop is started on the cluster nodes.
|
| Equals(Object) | (Inherited from Object.) |
| GetHashCode()()()() | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetType()()()() | Gets the type of the current instance. (Inherited from Object.) |
| Instances |
A specification of the number and type of Amazon EC2 instances on which to run the job flow.
|
| JobFlowRole |
An IAM role for the job flow. The EC2 instances of the job flow assume this role. The default role is EMRJobflowDefault. In order to
use the default role, you must have already created it using the CLI.
Constraints: |
| 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.
Constraints: |
| Name |
The name of the job flow.
Constraints: |
| Steps |
A list of steps to be executed by the job flow.
|
| SupportedProducts |
A list of strings that indicates third-party software to use with the job flow. For more information, go to Use Third Party Applications with
Amazon EMR. Currently supported values are:
|
| ToString()()()() | Returns a string that represents the current object. (Inherited from Object.) |
| VisibleToAllUsers |
Whether the job flow is visible to all IAM users of the AWS account associated with the job flow. If this value is set to true, all
IAM users of that AWS account can view and (if they have the proper policy permissions set) manage the job flow. If it is set to
false, only the IAM user that created the job flow can view and manage it.
|
| WithAdditionalInfo(String) |
Sets the AdditionalInfo property
|
| WithAmiVersion(String) |
Sets the AmiVersion property
|
| WithBootstrapActions(array<BootstrapActionConfig>[]()[][]) |
Adds elements to the BootstrapActions collection
|
| WithBootstrapActions(IEnumerable<(Of <<'(BootstrapActionConfig>)>>)) |
Adds elements to the BootstrapActions collection
|
| WithInstances(JobFlowInstancesConfig) |
Sets the Instances property
|
| WithJobFlowRole(String) |
Sets the JobFlowRole property
|
| WithLogUri(String) |
Sets the LogUri property
|
| WithName(String) |
Sets the Name property
|
| WithSteps(array<StepConfig>[]()[][]) |
Adds elements to the Steps collection
|
| WithSteps(IEnumerable<(Of <<'(StepConfig>)>>)) |
Adds elements to the Steps collection
|
| WithSupportedProducts(array<String>[]()[][]) |
Adds elements to the SupportedProducts collection
|
| WithSupportedProducts(IEnumerable<(Of <<'(String>)>>)) |
Adds elements to the SupportedProducts collection
|
| WithVisibleToAllUsers(Boolean) |
Sets the VisibleToAllUsers property
|
Inheritance Hierarchy| Object | ||
 | AmazonWebServiceRequest | |
| RunJobFlowRequest | |
See Also