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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The DataNode JVM on one host is not active.
B) One physical host crashed.
C) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
D) The HDFS cluster is in the safe mode.

2. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
C) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
D) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.

3. Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?

A) Nodemanager
B) Namenode
C) Jobtracker
D) Tasktracker
E) Applicationmaster
F) Resourcemanager
G) Datanode
H) applicationmanager

4. You configure your hadoop development cluster with both mapreduce frameworks, mapreduceV1 (MRv1) and mapreduce v2 (MRv2/YARN). You plan to run only one set of mapreduce daemons at a time in this development environment (running both simultaneously results in an unsuitable cluster but configure in both moving between them is fine). Which two mapreduce (capitation) daemons do you need to configure to run on your masternodes?

A) Nodemanager
B) Jobtracker
C) Applicationmaster
D) Resourcemanager
E) Journalnode
F) Containermanager

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

Solutions: