CCD-410問題集、Cloudera実際の試験問題

質問 1

The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task finish first are used. This is called:

A. Speculative Execution

B. IdentityReducer

C. IdentityMapper

D. Combine

E. Default Partitioner

正解: A

解説: (PassTest メンバーにのみ表示されます)

質問 2

You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

A. Increase the number of disks (or size) for the NameNode.

B. Increase the block size on your remaining files.

C. Decrease the block size on your remaining files.

D. Increase the amount of memory for the NameNode.

E. Decrease the block size on all current files in HDFS.

F. Increase the block size on all current files in HDFS.

正解: C

質問 3

You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

A. Three, the pound sign is an invalid character for HDFS file names

B. Two, file names with a leading period or underscore are ignored

C. One, no special characters can prefix the name of an input file

D. Four, all files will be processed

E. None, the directory cannot be named jobdata

正解: B

解説: (PassTest メンバーにのみ表示されます)

質問 4

Which describes how a client reads a file from HDFS?

A. The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.

B. The client queries the NameNode for the block location(s). The NameNode returns the block location(s) to the client. The client reads the data directory off the DataNode(s).

C. The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly off the DataNode.

D. The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode redirects the client to the DataNode that holds the requested data block(s). The client then reads the data directly off the DataNode.

正解: B

解説: (PassTest メンバーにのみ表示されます)

質問 5

Your client application submits a MapReduce job to your Hadoop cluster. Identify the Hadoop daemon on which the Hadoop framework will look for an available slot schedule a MapReduce operation.

A. TaskTracker

B. NameNode

C. JobTracker

D. DataNode

E. Secondary NameNode

正解: C

解説: (PassTest メンバーにのみ表示されます)

質問 6

Your cluster's HDFS block size in 64MB. You have directory containing 100 plain text files, each of which is 100MB in size. The InputFormat for your job is TextInputFormat. Determine how many Mappers will run?

A. 100

B. 200

C. 640

D. 64

正解: B

解説: (PassTest メンバーにのみ表示されます)

Cloudera Certified Developer for Apache Hadoop (CCDH) - CCD-410 模擬練習