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Cassandra uses Cassandra File System (CFS) and Hadoop uses Hadoop Distributed File System (HDFS)

I'm already using Pig over HDFS and i would like to install Cassandra.

Having additional servers for Cassandra is might inefficient to the fact that i already have Hadoop setup.

Can Cassandra use HDFS instead of CFS?

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The Hadoop Support section of the Cassandra Wiki says:

Cassandra's Hadoop support implements the same interface as HDFS to achieve input data locality (see cluster configuration for details on data locality and how to split your analytic and realtime read loads).

So the answer appears to be, "yes".

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