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From Omkar Joshi <ojo...@hortonworks.com>
Subject Re: In YARN, how does a task tracker knows the address of a job tracker?
Date Thu, 21 Nov 2013 19:06:37 GMT

Starting with YARN there is no notion of job tracker and task tracker. Here
is a quick summary
JobTracker :-
1) Resource management :- Now done by Resource Manager (it does all
scheduling work)
2) Application state management :- managing and launching new map /reduce
tasks (done by Application Master .. It is per job not one single entity in
the cluster for all jobs like MRv1).
TaskTracker :- replaced by Node Manager

I would suggest you read the YARN blog
This will answer most of your questions. Plus read
12) for how job actually gets executed.

Omkar Joshi
*Hortonworks Inc.* <http://www.hortonworks.com>

On Thu, Nov 21, 2013 at 7:52 AM, ricky l <rickylee0815@gmail.com> wrote:

> Hi all,
> I have a question of how a task tracker identifies job tracker address
> when I submit MR job through YARN. As far as I know, both job tracker and
> task trackers are launched through application master and I am curious
> about the details about job and task tracker launch sequence.
> thanks.

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