Cloudera CCA-410 : Cloudera Certified Administrator for Apache Hadoop CDH4

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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You configure Hadoop cluster with both MapReduce frameworks, MapReduce v1 (MRv1) and MapReduce v2 (MRv2/YARN). Which two MapReduce (computational) daemons do you need to configure to run on your master nodes?

A) ResourceManager
B) NodeManager
C) JournalNode
D) JobTracker
E) ApplicationMaster

2. Which scheduler would you deploy to ensure that your cluster allows short jobs to finish within a reasonable time without starving long-running jobs?

A) FIFO Scheduler
B) Fair Scheduler
C) Completely Fair Scheduler (CFS)
D) Capacity Scheduler

3. What happens when a map task crashes while running a mapreduce job?

A) the jobtracket attempts to re-run the task on a different node
B) The tasktracker closes the JVM instance and restarts
C) The job immediately fails
D) The jobtracker attempts to re-run the task on the same node

4. Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?

A) The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.
B) The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
C) The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.
D) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.

5. You are running two Hadoop clusters(cluster1 and cluster2), they run identical versions of hadoop.
You want to copy the data inside /home/foo/cluster1 to cluster2 into the directory /home/bar/
What is the correct distcp syntax to copy one directory tree from one cluster to the other cluster?

A) $ distCp cluster1:/home/foo cluster2:/home/bar/
B) $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
C) $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/
D) $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/

Solutions: