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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. When requesting a file, how does HDFS retrieves the blocks associated with that file?

A) the client polls the datanodes for the block ID's
B) the namenode requires the datanode for the block ID's
C) The namenode reads the block ID's from memory
D) the namenode reads the block ID's from disk

2. What occurs when you run a hadoop job specifying output directory for job output which already exists in HDFS?

A) An error will occur immediately because the output directory must not already exist.
B) the job will run successfully. Output from the reducers will override the contents of existing directory
C) an error will occur after the mappers have completed but before any reducers begin to run because the output path must not exist during the shuffle and sort.
D) the job will run successfully output from the reducers will be placed in a directory called job output -1

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

4. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor processor utilization.
B) Ability to monitor number of files in HDFS.
C) Ability to monitor NameNode memory usage.
D) Ability to monitor the amount of free space on HDFS.
E) Ability to monitor free task slots.

5. For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

A) In HDFS, in the directory of the user who generates the job.
B) Cached on the local disk of the slave node running the task, then copied into HDFS.
C) Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
D) On the local disk of the slave node running the task.

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