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 <rickylee0...@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. > -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
