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From ricky l <rickylee0...@gmail.com>
Subject Re: In YARN, how does a task tracker knows the address of a job tracker?
Date Thu, 21 Nov 2013 19:35:40 GMT
Thank you for the answer, Omkar.

I read the links that were helpful. Though the concept of job tracker/task
tracker does not exist in the YARN MapReduce, doesn't it use the binary of
job/task tracker? I though the application master runs job tracker binary
and the containers in the node will run task tracker binary. thx


On Thu, Nov 21, 2013 at 2:06 PM, Omkar Joshi <ojoshi@hortonworks.com> wrote:

> Hi,
>
> 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 post<http://hortonworks.com/blog/resource-localization-in-yarn-deep-dive/>.
> This will answer most of your questions. Plus read this<http://www.slideshare.net/ovjforu/yarn-way-to-share-cluster-beyond>
(slide
> 12) for how job actually gets executed.
>
> Thanks,
> 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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