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From Vinod Kumar Vavilapalli <vino...@hortonworks.com>
Subject Re: Umbilical interface
Date Mon, 22 Apr 2013 17:06:16 GMT

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


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