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Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application containers and monitoring

Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application
containers and monitoring application resource usage?

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A.
ResourceManager

B.
NodeManager

C.
ApplicationMaster

D.
ApplicationMasterService

E.
TaskTracker

F.
JobTracker

Explanation:
The fundamental idea of MRv2 (YARN) 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: Let’s walk through an application execution sequence :
Reference: Apache Hadoop YARN – Concepts & Applications

6 Comments on “Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application containers and monitoring

  1. Westby says:

    Answer is B:

    The YARN node managers, which launch and monitor the compute containers on
    machines in the cluster.

    Hadoop the define guide Page 198




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  2. Debi says:

    C

    It is the Application Master which monitors application resource usage. NodeManager keeps track of the entire Node resource usage , but not at application level.




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