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質問 1：
Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02
A. Nn01 is fenced, and nn02 becomes the active NameNode
B. Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
C. nn02 becomes the standby NameNode and nn02 becomes the active NameNode
D. Nn01 is fenced, and nn01 becomes the active NameNode
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 2：
Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?
A. NameNode
B. Standby NameNode
C. JournalNode
D. BackupNode
E. CheckpointNode
F. NodeManeger
G. Secondary NameNode
正解：B
解説: (Pass4Test メンバーにのみ表示されます)
質問 3：
How does HDFS Federation help HDFS Scale horizontally?
A. HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
B. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D. HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 4：
Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?
A. a maximum of 100GB on each hard drive may be used to store HDFS blocks
B. 25 GB on each hard drive may not be used to store HDFS Blocks
C. 100 GB on each hard drive may not be used to store HDFS blocks
D. All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
正解：C
解説: (Pass4Test メンバーにのみ表示されます)
質問 5：
Which command does Hadoop offer to discover missing or corrupt HDFS data?
A. The map-only checksum utility,
B. Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
C. Dskchk
D. Fsck
E. Du
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 6：
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)
Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02
A. Nn01 is fenced, and nn02 becomes the active NameNode
B. Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
C. nn02 becomes the standby NameNode and nn02 becomes the active NameNode
D. Nn01 is fenced, and nn01 becomes the active NameNode
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 2：
Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?
A. NameNode
B. Standby NameNode
C. JournalNode
D. BackupNode
E. CheckpointNode
F. NodeManeger
G. Secondary NameNode
正解：B
解説: (Pass4Test メンバーにのみ表示されます)
質問 3：
How does HDFS Federation help HDFS Scale horizontally?
A. HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
B. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D. HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 4：
Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?
A. a maximum of 100GB on each hard drive may be used to store HDFS blocks
B. 25 GB on each hard drive may not be used to store HDFS Blocks
C. 100 GB on each hard drive may not be used to store HDFS blocks
D. All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
正解：C
解説: (Pass4Test メンバーにのみ表示されます)
質問 5：
Which command does Hadoop offer to discover missing or corrupt HDFS data?
A. The map-only checksum utility,
B. Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
C. Dskchk
D. Fsck
E. Du
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 6：
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)
Shibuya -
前回の試験では及ばず落ちましが4月の試験でPass4Testのこの問題集を購入して今回合格出来ました。