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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. 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 output data, significantly larger than the amount of intermediate data.
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 intermediate data, on the order of the input data itself.

2. For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?

A) There are always exactly as many task attempts as there are tasks.
B) There are always at least as many task attempts as there are tasks.
C) The developer sets the number of task attempts on job submission.
D) There are always at most as many tasks attempts as there are tasks.

3. You configure Hadoop cluster with both MapReduce frameworks, MapReduce v1 (MRv1) and MapReduce v2 (MRv2/YARN). Which two MapReduce (computational) daemons do you need to configure to run on your master nodes?

A) JobTracker
B) JournalNode
C) ResourceManager
D) ApplicationMaster
E) NodeManager

4. What is the standard configuration of slave nodes in a Hadoop cluster?

A) Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.
B) Each slave node runs a JobTracker and a DataNode daemon.
C) Each slave node runs a TaskTracker and a DataNode daemon.
D) Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
E) Each slave node either runs a TaskTracker or a DataNode daemon, but not both.

5. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
B) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.

Solutions: