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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?

A) All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
B) 100 GB on each hard drive may not be used to store HDFS blocks
C) 25 GB on each hard drive may not be used to store HDFS Blocks
D) a maximum of 100GB on each hard drive may be used to store HDFS blocks

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

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

3. 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, it will get assigned tasks, while job A continues to run with fewer tasks.
C) When job A gets submitted, it consumes all the task slot
D) When job B gets submitted, Job A has to finish first, before job it can get scheduled.

4. Your developers request that you enable them to use pig on your hadoop cluster. What do you need to configure and / or install?

A) Install the pig interpreter on the master node which is running the jobtracker
B) Install the pig interpreter on the client machines only.
C) Install the pig interpreter on all nodes in the cluster, and the client machines
D) Install the pig jar's on the all slave nodes in the cluster the pig interpreter on the client machines

5. What is the best disk configuration for slave nodes in hadoop cluster where each node has 6x2TB drives?

A) A single Linux LVM (Logical volume Manager) volume
B) A RAID 5 array
C) Six separate volumes
D) Three RAID 1 arrays

Solutions: