title: Can mapper output keys be routed to a specific node in Hadoop MR
body: <p>I need to process some data in MR and load it into an external system that sits on the same physical machines as my MR nodes. Right now I run the job and read the output from HDFS and re-route individual records back out onto the desired nodes.</p>
  
  <p>Is it possible to define some mapping such that records with key X always go straight to the desired node Y? Simply put, I want to control where hadoop routes post-sorted partitioned groups.</p>