The open-source Hadoop and MapReduce software pose a potential threat to the $30 billion relational database market dominated by Oracle and Teradata, Rolfe Winkler writes. IDC's Carl Olofson forecasts the Hadoop market could grow from $77 million in 2011 to about $800 million in 2016, with the big database-software vendors accounting for 5% to 10% of that market.

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