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HDFS, mail # user - Re: Umbilical interface


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Re: Umbilical interface
Rahul Bhattacharjee 2013-04-23, 02:18
Thanks Vinod

On Monday, April 22, 2013, Vinod Kumar Vavilapalli wrote:

>
> 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
>
>
>