Cloudera CCA-470 real exam prep : Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH)

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Cloudera CCA-470 Exam Syllabus Topics:

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

1. How does the HDFS architecture provide redundancy?

A) Storing multiple replicas of data blocks on different DataNodes.
B) DataNodes make copies of their data blocks, and put them on different local disks.
C) Reliance on RAID at each datanode.
D) Reliance on SAN devices as a DataNode interface.

2. You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A) The file successfully writes to /users/reports/myreports/myreport.txt.
B) The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
C) The client throws an exception.
D) The file writes fails silently; no file is written, no error is reported.

3. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A) No new can be added to the cluster until you specify them in the dfs.hosts file.
B) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
C) Any machine running the DataNode daemon can immediately join the cluster.
D) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.

4. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A) 30
B) 10
C) 1
D) We cannot say; the number of Mappers is determined by the developer

5. What is the standard configuration of slave nodes in a Hadoop cluster?

A) Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
B) Each slave node runs a JobTracker and a DataNode daemon.
C) Each slave node either runs a TaskTracker or a DataNode daemon, but not both.
D) Each slave node runs a TaskTracker and a DataNode daemon.
E) Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.

Solutions: