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MapReduce >> mail # user >> Multi-stage map/reduce jobs

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Multi-stage map/reduce jobs
It's not clear to me how to stitch together multiple map reduce jobs.  Without using cascading or something else like it, is the method basically to write to a intermediate spot, and have the next stage read from there?

If so, how are jobs responsible for cleaning up the temp/intermediate data they create?  What happens if stage 1 completes, and state 2 doesn't, do the stage 1 files get left around?

Does anyone have some insight they could share?