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Hadoop MapReduce programmers often find that it is more convenient and productive to have direct access from their MapReduce programs to data stored in a RDBMS such as Teradata Enterprise Data Warehouse (EDW) because:

  1. There is no benefit to exporting relational data into a flat file.
  2. There is no need to upload the file into the Hadoop Distributed File System (HDFS).
  3. There is no need to change and rerun the scripts/commands in the first two steps when they need to use different tables/columns in their MapReduce programs.

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