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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. 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) On the local disk of the slave node running the task.
C) Cached on the local disk of the slave node running the task, then copied into HDFS.
D) Cached on the local disk of the slave node running the task, then purged immediately upon task completion.

2. What are the permissions of a file in HDFS with the following:rw-rw-r-x?

A) the owner and group can read the file other can't
B) the owner and group cannot delete the file, but other can
C) No one can modify the content of the file
D) the owner and group can modify the contents of the file other can't
E) HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files

3. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
B) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
C) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.
D) Reducers don't write blocks into HDFS

4. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Client application B must wait until the entire file has been written, and will then read its entire contents.
B) Client application B returns an error
C) Application B can read 256MB of the file
D) Client application on B can read the 300MB that has been written so far.

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

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

Solutions: