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Those just experimeting with Amazon's Elastic MapReduce can get started immediately by running a sample application, rather than running their own code on their own data. Amazon offers WordCount (the ubiquitous Hadoop sample application) as well as a Hive-based contextual advertising sample, Java and Pig-based log analysis samples and another Java-based sample that looks at data from Amazon's CloudBurst service.
The Specify Parameters screen allows you configure backup options for your HBase cluster, and/or to create the new cluster by restoring from an existing backup.
If you just want to play in the sandbox though, you can disregard the backup options, but make sure to select the Hive and Pig checkboxes in the Install Additional Packages section at the bottom of the screen, then click Continue.