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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set by the JobTracker based on the amount of intermediate data.
B) It is set by the Hadoop framework and is based on the number of InputSplits of the job.
C) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
D) It is set by the developer.

2. You have a cluster running 32 slave nodes and 3 master nodes running mapreduce V1 (MRv1). You execute the command:
$ hadoop fsck /
What four cluster conditions running this command will return to you?

A) Under-replicated blocks
B) the location for every block
C) Configure capacity of your cluster
D) The current state of the file system returned from scanning individual blocks on each datanode
E) Number of dead datanodes
F) Number of datanodes
G) the current state of the file system according to the namenode
H) Blocks replicated improperly or that don't satisfy your cluster enhancement policy (e. g. , too many blocks replicated on the same node)

3. Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02

A) Hadoop02 is fenced, and hadoop01 becomes active namenode
B) Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode
C) Hadoop01 becomes inactive and hadoop02 becomes the active namenode
D) Hadoop01 is fenced, and hadoop02 becomes the active namenode

4. MapReduce V2 (MRv2/YARN) splits which two major functions of the jobtracker into separate daemons?

A) Job scheduling/monitoring
B) Launching tasks
C) Health status check (heartbeats)
D) Managing tasks
E) Resource management
F) MapReduce metric reporting
G) Managing file system metadata
H) Job coordination between the resource manager and the node manager

5. Which two features does Kerberos security add to a Hadoop cluster?

A) Authentication for user access to the cluster against a central server
B) Encryption on all remote procedure calls (RPCs)
C) User authentication on all remote procedure calls (RPcs)
D) Root access to the cluster for users hdfs and mapred but non-root acess clients
E) Encryption for data on disk ("at rest")

Solutions: