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

1. You have a 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 the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
B) The order of execution of tasks within a job may vary.
C) Since job B needs only a few tasks, if might finish before job A completes.
D) When a job is submitted, all tasks belonging to that job are scheduled.

2. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) The file cannot be deleted by anyone
B) The file's contents can be modified by the owner, but no-one else
C) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
D) The file cannot be deleted by anyone but the owner
E) The file cannot be run as a MapReduce job

3. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) Because there are seven racks the block is written to a node on each rack
B) All three of the block are written to nodes on the same rack
C) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack
D) One copy of the block is written to a node in each of three racks

4. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set by the JobTracker based on the amount of intermediate data.
B) It is set by the developer.
C) It is set by the Hadoop framework and is based on the number of InputSplits of the job.
D) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.

5. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

A) To ensure that all blocks in the cluster are 128MB in size.
B) To improve data locality for MapReduce tasks.
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 HDTS for additional data.

Solutions: