最新なCloudera CCA-470問題集（87題）、真実試験の問題を全部にカバー！

質問 1：
What is the Secondary NameNode?
A. A process that performs a checkpoint operation on the files produced by the NameNode.
B. A standby NameNode, for high availability.
C. A data channel between the primary name node and the tertiary NameNode.
D. An alternate data channel for clients to reach HDFS, should the NameNode become too busy.
E. A process purely intended to perform backups of the NameNode.
正解：A
解説: (Pass4Test メンバーにのみ表示されます)

質問 2：
Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?
A. Multiple racks simultaneously fail.
B. An entire rack fails.
C. Seventy percent of DataNodes simultaneously fail.
D. Ten percent of DataNodes simultaneously fail.
E. All DataNodes simultaneously fail.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)

質問 3：
Which of the following statements is the most accurate about the choice of operating systems to run on a Hadoop cluster?
A. Linux is preferable to Windows and Solaris/OpenSolaris, but the choice of Linux distribution is unimportant when planning a Hadoop cluster.
B. Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.
C. The choice of operating system isn't very important for a Hadoop cluster.
D. Linux and Solaris/OpenSolaris are preferable to Windows. Solaris running on SPARC hardware is the preferred Hadoop slave node configuration.
正解：B
解説: (Pass4Test メンバーにのみ表示されます)

質問 4：
Which of the following statements arc accurate in describing features of Hadoop rack awareness? (Choose 2)
A. Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.
B. Even for small clusters on a single rack, configuring rack awareness will improve performance.
C. HDFS is rack aware but MapReduce daemons are not.
D. Rack location is considered in the HDFS block placement policy.
E. Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.
正解：A,D

質問 5：
How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?
A. They must be formatted as either ext3 or ext4
B. They must be formatted as HDFS
C. They may be formatted in nay Linux filesystem
D. They must not be formatted - - HDFS will format the filesystem automatically
正解：A
解説: (Pass4Test メンバーにのみ表示されます)

質問 6：
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. Amount of memory on the NameNode.
C. Number of DataNodes.
D. Disk capacity of the NameNode.
E. Number of files that will be stored in HDFS.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)

質問 7：
You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?
A. Two active NameNodes and one Standby NameNode
B. Two active NameNodes and two Standby NameNodes
C. One active NameNode and one Standby NameNode
D. Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
正解：C
解説: (Pass4Test メンバーにのみ表示されます)

質問 8：
What does CDH packaging do on install to facilitate Kerberos security setup?
A. Creates and configures you kdc with default cluster values.
B. Creates users for hdfs and mapreduce to facilitate role assignment.
C. Creates a set of pre-configured Kerberos keytab files and their permissions.
D. Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
E. Creates directories for temp, hdfs, and mapreduce with correct permissions.
正解：B
解説: (Pass4Test メンバーにのみ表示されます)

質問 9：
What would be a reasonable configuration of disk drives in a Hadoop datanode?
A. 48 1.5TB disk drives in a JBOD configuration
B. Four 1TB disk drives in a JBOD configuration
C. One 1TB disk drive
D. Four 1TB disk drives in a RAID configuration
E. 48 1.5 TB disk drives in a RAID configuration
正解：B
解説: (Pass4Test メンバーにのみ表示されます)