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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

2. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) The number mappers is equal to no of input splits calculated by client submitting
B) the jobtracker chooses the number based on no of available nodes
C) the developer specifies the number in the job configuration
D) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files

3. In the context of configuring a Hadoop cluster for HDFS High Availability (HA), 'fencing' refers to:

A) Isolating both HA NameNodes to prevent a client application from killing the NameNode daemons.
B) Isolating a failed NameNode from write access to the fsimage and edits files so that is cannot resume write operations if it recovers.
C) Isolating the cluster's master daemon to limit write access only to authorized clients.
D) Isolating the standby NameNode from write access to the fsimage and edits files.

4. Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

A) BackupNode
B) CheckpointNode
C) Standby NameNode
D) Secondary NameNode
E) JournalNode
F) NodeManeger
G) NameNode

5. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) The master and slave nodes should have the same hardware configuration
B) The master nodes requires more memory and no disk drives
C) The master nodes require more memory and greater disk capacity then the slave nodes
D) the master nodes requires less memory and fewer number disk drives than the slave nodes
E) The master nodes requires more memory but less disk capacity

Solutions: