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For Amazon EMR releases 3.x and 2.x. For Amazon EMR releases 4.x and greater, use ReleaseLabel.

The version of the Amazon Machine Image (AMI) to use when launching Amazon

EC2 instances in the job flow. The following values are valid:

The version number of the AMI to use, for example, "2.0."

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 HadoopVersion parameter to modify the version of Hadoop from the defaults shown above.

For details about the AMI versions currently supported by Amazon Elastic MapReduce, go to AMI Versions Supported in Elastic MapReduce ( in the Amazon Elastic MapReduce Developer's Guide.

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