Amazon Elastic MapReduce
Developer Guide (API Version 2009-03-31)
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Hadoop Configuration Reference

Apache Hadoop runs on the EC2 instances launched in a cluster. Amazon Elastic MapReduce (Amazon EMR) defines a default configuration for Hadoop, depending on the Amazon Machine Image (AMI) that you specify when you launch the cluster. For more information about the supported AMI versions, see Choose a Machine Image .

The following sections describe the various configuration settings and mechanisms available in Amazon EMR.