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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?

A) Nodemanager
B) Datanode
C) Tasktracker
D) Resourcemanager
E) Applicationmaster
F) applicationmanager
G) Namenode
H) Jobtracker

2. Under which scenario would it be most appropriate to consider using faster (e.g 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workloads generates a large amount of intermediate data, on the order of the input data itself.
B) When the typical workloads consumes a large amount of input data, relative to the entire capacity of HDFS.
C) When the typical workloads consists of processor-intensive tasks.
D) When the typical workloads generates a large amount of output data, significantly larger than the amount of intermediate data.

3. How do you access the long messages a mapreduce application generates after you run it on your cluster?

A) You connect to the job tracker web UI and locate the details for your job this will include long messages
B) You remotely log in to any slave node in the cluster to browse your jobs log files in/var/log/hadoop/archive directly
C) You browse the currect working directory of the client machine from which You submitted the job
D) You browse the /logs directly in HDFS where all jobs log files as store

4. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor the amount of free space on HDFS.
B) Ability to monitor processor utilization.
C) Ability to monitor NameNode memory usage.
D) Ability to monitor number of files in HDFS.
E) Ability to monitor free task slots.

5. What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?

A) They can use different file system
B) they must all be left as formatted raw disk, hadoop format them automatically
C) They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode
D) They must all use the same filesystem as the namenode
E) They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS

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