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

1. Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.
B) When the typical workload consists of processor-intensive tasks.
C) When the typical workload generates a large amount of intermediate data, on the order of the input data itself.
D) When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.

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 run as a MapReduce job
E) The file cannot be deleted by anyone but the owner

3. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Shut one NameNode down for maintenance without halting the cluster
B) Configure unlimited hot standby NameNode.
C) Automatically 'fail over' between NameNodes if one goes down
D) Manually 'fail over' between NameNodes
E) Write data to two clusterssimultaneously

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 and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
D) It is set by the Hadoop framework and is based on the number of InputSplits of the job.

5. What metadata is stored on a DataNode when a block is written to it?

A) Checksums for the data in the block, as a separate file.
B) None. Only the block itself is written.
C) Information on the file's location in HDFS.
D) Node location of each block belonging to the same namespace.

Solutions: