It is the same as all other communication in Hadoop: Hadoop RPC which in turn is java RPC over a TPC connection.
Thanks, +Vinod Kumar Vavilapalli Hortonworks Inc. http://hortonworks.com/ On Apr 22, 2013, at 8:27 AM, Rahul Bhattacharjee wrote: > Hi, > > Tasktracer runs each of the tasks (M or R) in a separate VM (considering VM > reuse is disabled).So the actual task and task tracer daemon run in two > different OS processes. Umbilical interface is used by tasks to send its > progress to the task tracer. > > Considering that both are different process then how is the umbilical > interface implemented ? shared file , sockets (unlikely) or .. > > Thanks, > Rahul
