Amazon Elastic MapReduce
Developer Guide (API Version 2009-03-31)
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Upgrade the Configuration Files

Apache deprecated the hive-default.xml file for Hive 0.8 and newer. However, Amazon EMR still uses hive-default.xml to maintain its default configuration settings. You can add a new configuration by appending it to either hive-default.xml or hive-site.xml. In addition, you can override an existing configuration in hive-default.xml either by changing its value in hive-default.xml or adding it to hive-site.xml.