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

1. When determining the most appropriate ratio of processor cores to disk drives for a Hadoop cluster, what are the considerations?

A) Processors and disk drives per machine, the workload doesn't matter
B) Processor core counts and workload type, the ratio doesn't matter
C) Disk drives per core and workload types
D) Disk drives per machine, nothing else matters.
E) Disk drives per core without consideration to workload types

2. Identify two features/issues that MapReduce v2 (MRv2/YARN) is designed to address:

A) Resource pressure on the JobTrackr
B) HDFS latency.
C) Ability to run frameworks other than MapReduce, such as MPI.
D) Reduce complexity of the MapReduce APIs.
E) Single point of failure in the NameNode.
F) Standardize on a single MapReduce API.

3. Which two features does Kerberos security add to a Hadoop cluster?

A) Encryption on all remote procedure calls (RPCs)
B) Authentication for user access to the cluster against a central server
C) User authentication on all remote procedure calls (RPcs)
D) Root access to the cluster for users hdfs and mapred but non-root acess clients
E) Encryption for data on disk ("at rest")

4. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
B) Tasks are scheduled in the order of their jobs' submission.
C) The order of execution of tasks within a job may vary.
D) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
E) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
F) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.

5. 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) There are always at most as many tasks attempts as there are tasks.
D) The developer sets the number of task attempts on job submission.

Solutions: