最新的Hortonworks Apache-Hadoop-Developer免費考試真題

問題1

Given the following Hive commands:

Which one of the following statements Is true?

A. The file mydata.txt does not move from Its current location in HDFS

B. The file mydata.txt is moved to a subfolder of /apps/hive/warehouse

C. The file mydata.txt is copied to a subfolder of /apps/hive/warehouse

D. The file mydata.txt is copied into Hive's underlying relational database 0.

正確答案: C

問題2

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 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.

C. 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).

D. 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.

正確答案: C

說明：（僅 Fast2test 成員可見）

問題3

MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate
daemons? Select two.

A. Managing tasks

B. Launching tasks

C. Managing file system metadata

D. MapReduce metric reporting

E. Heath states checks (heartbeats)

F. Resource management

G. Job scheduling/monitoring

H. Job coordination between the ResourceManager and NodeManager

正確答案: F,G

說明：（僅 Fast2test 成員可見）

問題4

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. Four, all files will be processed

D. None, the directory cannot be named jobdata

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

正確答案: B

說明：（僅 Fast2test 成員可見）

問題5

You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A. 3

B. 1

C. 5

D. 0

E. 6

正確答案: A

說明：（僅 Fast2test 成員可見）

問題6

Which best describes how TextInputFormat processes input files and line breaks?

A. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.

B. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.

C. Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.

D. The input file is split exactly at the line breaks, so each RecordReader will read a series of complete lines.

E. Input file splits may cross line breaks. A line that crosses file splits is ignored.

正確答案: A

說明：（僅 Fast2test 成員可見）

最新的Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer - Apache-Hadoop-Developer免費考試真題

聯系我們

站內鏈接

最新更新