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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:
1. You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?
A) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
B) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
C) Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
D) Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information
2. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?
A) They may be formatted in nay Linux filesystem
B) They must be formatted as either ext3 or ext4
C) They must not be formatted - - HDFS will format the filesystem automatically
D) They must be formatted as HDFS
3. You are running two Hadoop clusters(cluster1 and cluster2), they run identical versions of hadoop.
You want to copy the data inside /home/foo/cluster1 to cluster2 into the directory /home/bar/
What is the correct distcp syntax to copy one directory tree from one cluster to the other cluster?
A) $ distCp cluster1:/home/foo cluster2:/home/bar/
B) $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/
C) $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
D) $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
4. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?
A) The block size of files in the cluster can be determined as the block is written.
B) The block size of files in the duster will all at least be 64MB.
C) The block size of files in the Cluster will all be multiples of 64M
D) The block size of files in the cluster will all be the exactly 64MB.
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 require more memory and greater disk capacity then the slave nodes
C) the master nodes requires less memory and fewer number disk drives than the slave nodes
D) The master nodes requires more memory and no disk drives
E) The master nodes requires more memory but less disk capacity
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: A | Question # 3 Answer: C | Question # 4 Answer: D | Question # 5 Answer: E |
By Quincy
