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NO.1 For each intermediate key, each reducer task can emit:
A. As many final key-value pairs as desired, but they must have the same type as the intermediate
key-value pairs.
B. As many final key-value pairs as desired, as long as all the keys have the same type and all the
values have the same type.
C. As many final key-value pairs as desired. There are no restrictions on the types of those key-value
pairs (i.e., they can be heterogeneous).
D. One final key-value pair per key; no restrictions on the type.
E. One final key-value pair per value associated with the key; no restrictions on the type.
Answer: B

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Reference: Hadoop Map-Reduce Tutorial; Yahoo! Hadoop Tutorial, Module 4: MapReduce

NO.2 MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate
daemons? Select two.
A. Managing file system metadata
B. Launching tasks
C. MapReduce metric reporting
D. Resource management
E. Heath states checks (heartbeats)
F. Job scheduling/monitoring
G. Managing tasks
H. Job coordination between the ResourceManager and NodeManager
Answer: D,F

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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

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