1023 お客様のコメント
質問 1：
Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.
A. In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
B. In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
C. In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
D. In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 2：
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 will all be the exactly 64MB.
B. The block size of files in the cluster can be determined as the block is written.
C. The block size of files in the duster will all at least be 64MB.
D. The block size of files in the Cluster will all be multiples of 64M
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 3：
What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?
A. They can use different file system
B. They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode
C. they must all be left as formatted raw disk, hadoop format them automatically
D. They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS
E. They must all use the same filesystem as the namenode
正解：E
質問 4：
You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?
A. Increase the IO.sort.mb as high you can, as close to 1GB as possible.
B. Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
C. For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
D. Decrease the io.sort.mb value below 100M
正解：B
解説: (Pass4Test メンバーにのみ表示されます)
質問 5：
Identify two features/issues that MapReduce v2 (MRv2/YARN) is designed to address:
A. Reduce complexity of the MapReduce APIs.
B. Single point of failure in the NameNode.
C. Ability to run frameworks other than MapReduce, such as MPI.
D. Standardize on a single MapReduce API.
E. Resource pressure on the JobTrackr
F. HDFS latency.
正解：C,E
解説: (Pass4Test メンバーにのみ表示されます)
質問 6：
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 move the file
D. You can rename the file
E. You can update the files contents
正解：A,C,D
解説: (Pass4Test メンバーにのみ表示されます)
Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.
A. In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
B. In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
C. In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
D. In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)
質問 2：
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 will all be the exactly 64MB.
B. The block size of files in the cluster can be determined as the block is written.
C. The block size of files in the duster will all at least be 64MB.
D. The block size of files in the Cluster will all be multiples of 64M
正解：A
解説: (Pass4Test メンバーにのみ表示されます)
質問 3：
What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?
A. They can use different file system
B. They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode
C. they must all be left as formatted raw disk, hadoop format them automatically
D. They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS
E. They must all use the same filesystem as the namenode
正解：E
質問 4：
You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?
A. Increase the IO.sort.mb as high you can, as close to 1GB as possible.
B. Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
C. For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
D. Decrease the io.sort.mb value below 100M
正解：B
解説: (Pass4Test メンバーにのみ表示されます)
質問 5：
Identify two features/issues that MapReduce v2 (MRv2/YARN) is designed to address:
A. Reduce complexity of the MapReduce APIs.
B. Single point of failure in the NameNode.
C. Ability to run frameworks other than MapReduce, such as MPI.
D. Standardize on a single MapReduce API.
E. Resource pressure on the JobTrackr
F. HDFS latency.
正解：C,E
解説: (Pass4Test メンバーにのみ表示されます)
質問 6：
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 move the file
D. You can rename the file
E. You can update the files contents
正解：A,C,D
解説: (Pass4Test メンバーにのみ表示されます)
Araie -
友達にCCA-410問題集を進めてくれる。この問題集を勉強して、89％の点数を撮りました。大変嬉しいです。