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From Jonathan Ellis <>
Subject Re: Cassandra Map-Reduce
Date Sun, 05 Dec 2010 03:47:07 GMT
It doesn't make sense at the RecordReader layer to consume multiple
CFs.  Chaining them together is usually best left to a higher level
like Pig, although you could do it manually if you wanted to badly

On Fri, Dec 3, 2010 at 2:33 PM, Sanjay Acharya <> wrote:
> We are in the process of evaluating Cassandra for our needs and we expect to
> use parallelism for analytics on collected data. The following BLOG mentions
> that
> Cassandra's Map-Reduce support does not support multiple column families
> Has the same proven to be a challenge or blockers for those using the
> Map-Reduce functionality? Please share your experience. Also are there plans
> to support multiple column family map-reduce functionality?

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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