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

1. 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 FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
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 order of execution of tasks within a job may vary.
F) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.

2. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must restart the NameNode daemon to apply the changes to the cluster
B) You don't need to restart any daemon, as they will pick up changes automatically.
C) You must modify the configuration files on each of the six DataNode machines.
D) You must modify the configuration files on only one of the DataNode machine
E) You must restart all six DataNode daemons to apply the changes to the cluster.
F) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.

3. Choose three reasons why should you run the HDFS balancer periodically?

A) To improve data locality for MapReduce tasks.
B) To ensure that all blocks in the cluster are 128MB in size.
C) To ensure that there is consistent disk utilization across the DataNodes.
D) To help HDFS deliver consistent performance under heavy loads.
E) To ensure that there is capacity in HDFS tor additional data.

4. You has a cluster running with the Fail Scheduler enabled. There are currently no jobs running on the cluster you submit a job A, so that only job A is running on the cluster. A while later, you submit job B.
Now job A and Job B are running on the cluster al the same time. How will the Fair' Scheduler handle these two Jobs?

A) When job A gets submitted, it doesn't consume all the task slot
B) When job B gets submitted, Job A has to finish first, before job it can get scheduled.
C) When job A gets submitted, it consumes all the task slot
D) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.

5. 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 generates a large amount of output data, significantly larger than the amount of intermediate data.
D) When the typical workloads consists of processor-intensive tasks.

Solutions: