MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate
daemons? Select two.
A.
Heath states checks (heartbeats)
B.
Resource management
C.
Job scheduling/monitoring
D.
Job coordination between the ResourceManager and NodeManager
E.
Launching tasks
F.
Managing file system metadata
G.
MapReduce metric reporting
H.
Managing tasks
Explanation:
The fundamental idea of MRv2 is to split up the two major functionalities of the
JobTracker, resource management and job scheduling/monitoring, into separate daemons. The
idea is to have a global ResourceManager (RM) and per-application ApplicationMaster (AM). An
application is either a single job in the classical sense of Map-Reduce jobs or a DAG of jobs.
Note:
The central goal of YARN is to clearly separate two things that are unfortunately smushed together
in current Hadoop, specifically in (mainly) JobTracker:
/ Monitoring the status of the cluster with respect to which nodes have which resources available.
Under YARN, this will be global.
/ Managing the parallelization execution of any specific job. Under YARN, this will be done
separately for each job.
Reference: Apache Hadoop YARN – Concepts & Applications
Option B and C are correct
The JobTracker is responsible for resource management (managing the worker nodes i.e. TaskTrackers), tracking resource consumption/availability and also job life-cycle management (scheduling individual tasks of the job, tracking progress, providing fault-tolerance for tasks etc).
Source :Apache Hadoop YARN – Background and an Overview
0
0
It should be B and C
0
0
B,D
0
0
sorry B and C correct answer
0
0
B and C
0
0
B & C
0
0
B and D
0
0
B and C . D looks correct at first instance, but in MRv1 there was no concept of resource manager and Node manager.
0
0
Answers: B and C
Check out the below link(offical website of Apache Hadoop) for answers:
http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/YARN.html
0
0
Have someone actually managed to pass the exam with this question and answers. Cause there is no HiveQL questions that it says that are on the real exam?!
/Nosse
0
0
I have the same idea. BD
0
0