Yes, there is a way to use DBMS over JDBC. The feature is not realeased yet, but you can try it out, and give valuable feedback to us. You can find the patch and the jira issue at : https://issues.apache.org/jira/browse/HADOOP-2536

Lakshmi Narayanan wrote:
Has anyone tried using any RDBMS with the hadoop?  If the data is stored in
the database is there any way we can use the mapreduce with the database
instead of the HDFS?

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