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

1. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
B) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
C) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
D) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.

2. 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) The order of execution of tasks within a job may vary.
B) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
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.

3. For a MapReduce job, what's the relationship between tasks and task attempts?

A) There are always at least as many task attempts as there are tasks.
B) There are always at most as many task attempts as there are tasks.
C) There are always exactly as many task attempts as there are tasks.

4. You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.

A) 50 slave nodes
B) 10 slave nodes
C) 100 slave nodes
D) 100 slave nodes

5. Which of the following scenarios makes HDFS unavailable?

A) NameNode failure
B) DataNode failure
C) Secondary NameNode failure
D) JobTracker failure
E) TaskTracker failure

Solutions: