Alieh - you might want to look at MR concepts (job, input, output etc.). The short answer is *hadoop* doesn't decide anything, it's upto the MR job to decide input/output etc.
You might want to read through this: http://hadoop.apache.org/common/docs/stable/mapred_tutorial.html Arun On Feb 3, 2012, at 11:46 PM, Alieh Saeedi wrote: > Hi > 1- How does Hadoop decide where to save file blocks (I mean all files include > files written by reducers)? Could you please give me a reference link? > > -- Arun C. Murthy Hortonworks Inc. http://hortonworks.com/
