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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:
1. A slave node in your cluster has 24GB of Ram and 12 physical processor cores on hyper threading-enabled processor. You set the value of mapped. child.java.opts to -Xmx1G, and the value of mapred.tasktracker.map.tasks.maximum to 12. What is the appropriate value to set for mapred.Tastracker.reduce.tasks.maximum?
A) 12
B) 24
C) 20
D) 2
E) 16.
F) 6
2. Which three file actions can execute as you write a file into HDFS?
A) You can delete the file
B) You can index the file
C) You can update the files contents
D) You can move the file
E) You can rename the file
3. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?
A) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
B) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
C) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
D) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
4. What does each block of a file contain where it is return into HDFS?
A) Each block has a header and footer containing metadata
B) Each block as a header containing metadata
C) Each block contains only data from the file
D) Each block writes a separate meta file containing information on the file name of which the block is a part
5. Using cloudera manager on CDH4 cluster running mapreduce V1(MRv1), you delete a tasktracker role instance from a host that also a runs a datanode role instance and a region server role instance.cloudera
Manager make changes to the cluster and prompts you to the accept the changes.
What other configuration option will cloudera manager automatically prompt you to change?
A) The option to failover to the instance by namenode
B) the option to immediately rebalance the cluster
C) the option to specify an alternate slave host to place the received data node role instance
D) The option to change java maximum heap sizes for the other role instances
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: A,D,E | Question # 3 Answer: C | Question # 4 Answer: D | Question # 5 Answer: C |
By Stev
