Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) 認定 CCA-470 試験問題:
1. What would be a reasonable configuration of disk drives in a Hadoop datanode?
A) 48 1.5TB disk drives in a JBOD configuration
B) 48 1.5 TB disk drives in a RAID configuration
C) Four 1TB disk drives in a JBOD configuration
D) Four 1TB disk drives in a RAID configuration
E) One 1TB disk drive
2. When setting the HDFS block size, which of the following considerations is the least important?
A) Size of "typical" files that will be stored in HDFS.
B) Disk capacity of the NameNode.
C) Amount of memory on the NameNode.
D) Number of files that will be stored in HDFS.
E) Number of DataNodes.
3. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?
A) 30
B) 1
C) 10
D) We cannot say; the number of Mappers is determined by the developer
4. What does CDH packaging do on install to facilitate Kerberos security setup?
A) Creates a set of pre-configured Kerberos keytab files and their permissions.
B) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
C) Creates users for hdfs and mapreduce to facilitate role assignment.
D) Creates directories for temp, hdfs, and mapreduce with correct permissions.
E) Creates and configures you kdc with default cluster values.
5. What information is stored on disk on the NameNode? (Choose 4)
A) The status of the heartbeats of each DataNode.
B) Names of the files in HDFS.
C) A catalog of DataNodes and the blocks that are stored on them.
D) An edit log of changes that have been made since the last backup of the NameNode.
E) The directory structure of the files in HDFS.
F) File permissions of the files in HDFS.
G) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
質問と回答：
| 質問 # 1 正解： C | 質問 # 2 正解： B | 質問 # 3 正解： A | 質問 # 4 正解： C | 質問 # 5 正解： B、C、E、G |
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