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

1. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The application reads the blocks directly from the DataNodes.
B) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.
C) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.

2. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

A) The NameNode requires more memory and no disk drives.
B) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
C) The NameNode and DataNodes should have the same hardware configuration.
D) The NameNode requires more memory but less disk capacity.
E) The NameNode requires less memory and fewer number of disk drives than the DataNodes.

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

4. 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 B gets submitted, Job A has to finish first, before job it can get scheduled.
B) When job A gets submitted, it consumes all the task slot
C) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
D) When job A gets submitted, it doesn't consume all the task slot

5. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy physical blocks from the source to the target destination in your cluster.
B) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
C) Use distcp to copy data between directories inside the same cluster.
D) Use distcp to copy HBase table files.
E) Use distcp to run an internal MapReduce job to copy files.

Solutions: