Hi. I've tried the mapreduce example in 0.6 contrib/wordcount and it worked very well.
I have a shallow understanding of both worlds, so pardon my questions: Is the integration with hadoop just 'semantic' (ie map/reduce api is only used as query abstraction) or is it 'structural' (ie cassandra can 'talk to hadoop' and replace HDFS as input source)? In practice: - If I want to run a distributed mapreduce job on cassandra, does my cassandra cluster have to be an hadoop cluster as well? - do I get data locality optimization: I reckon cassandra can in principle figure out where it is best to execute a SlicePredicate/Mapper, but to do so it should take over some of the responsibilities of hadoop's jobtracker. Does it? Thanks. -- :Matteo Caprari matteo.capr...@gmail.com
