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 an Amazon Machine Image (AMI).

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