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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

2. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) TaskTracker
B) DataNode
C) JobTracker
D) NameNode
E) NodeManager
F) ResourceManager
G) ApplicationMaster

3. Your company stores user profile records in an OLTP database. You want to join these records with webserver logs. You have already ingested into the hadoop file system. What is the best way to obtain and ingest these user records?

A) Ingest using hives LOAD DATA command
B) Ingest with flume agents
C) Ingest using the HDFS put command
D) Ingest with hadoop streaming
E) Ingest with Pig's Load Command
F) Ingest with SQL import

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

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

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

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

Solutions: