You can check the explain plan . It provided the order of the execution.   It is not a rule that certain reucers would start after all the mapper phase.   The ceratin mapper phase depends on the results from the reducers too. You can check the explain plan .   If you want map join then you can set property map.auto.conevrt.join =true ... View more

Its a service that's running, not a job. So avoid killing it.  ... View more

Perfect solution, it works ... View more