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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:
1. What occurs when you run a hadoop job specifying output directory for job output which already exists in HDFS?
A) 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.
B) the job will run successfully. Output from the reducers will override the contents of existing directory
C) the job will run successfully output from the reducers will be placed in a directory called job output -1
D) An error will occur immediately because the output directory must not already exist.
2. What additional capability does Ganglia provide to monitor a Hadoop?
A) Ability to monitor the amount of free space on HDFS.
B) Ability to monitor NameNode memory usage.
C) Ability to monitor processor utilization.
D) Ability to monitor free task slots.
E) Ability to monitor number of files in HDFS.
3. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?
A) Approximately 100TB
B) Approximately 33 TB
C) Approximately 25TB
D) Approximately 10TB
4. You have a cluster running with the fair scheduler enabled and configured. You submit multiple jobs to the cluster. Each job is assigned to a pool. What are the two key points to remember about how jobs are scheduled with the fair scheduler?
A) Pools are assigned priorites.pools with higher priorities an executed b4 pools with lower priorities
B) Each pool gets 1/N of the total available tasks slots, where N is the no of jobs running on the cluster
C) Each pools share of task slots may change throughout the course of job execution
D) Each pool gets 1/M of the total available tasks slots, where M is the no. of nodes in the cluster
E) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints)
F) Each pools share of the tasks slots remains static within the execution of any individual job
5. What does CDH packaging do on install to facilitate Kerberos security setup?
A) Creates directories for temp, hdfs, and mapreduce with correct permissions.
B) Creates a set of pre-configured Kerberos keytab files and their permissions.
C) Creates users for hdfs and mapreduce to facilitate role assignment.
D) Creates and configures you kdc with default cluster values.
E) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: C,E | Question # 5 Answer: C |
By Simon
