Introducing Apache Hadoop to the organization can be difficult - everyone is trained and experienced in the old ways of SQL and all the analytics tools integrate with SQL. Certain technologies can help make the transition to Hadoop easier by providing support for SQL on Hadoop.
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Relational databases are here to stay - they are common, integrate with other information systems, do a good job of querying structured data, and people know how to use them. Some believe that adding Apache Hadoop to the organization means death to the good old RDBMS, but that is far from true.