HDPCD無料問題集「Hortonworks Data Platform Certified Developer」

質問 1

You've written a MapReduce job that will process 500 million input records and generated 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reduces which is a potential bottleneck. A custom implementation of which interface is most likely to reduce the amount of intermediate data transferred across the network?

（A）OutputFormat

（B）WritableComparable

（C）Partitioner

（D）Combiner

（E）InputFormat

（F）Writable

正解：D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 2

To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the best way to accomplish this?

（A）Place the data file in the DataCache and read the data into memory in the configure method of the mapper.

（B）Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.

（C）Place the data file in the DistributedCache and read the data into memory in the map method of the mapper.

（D）Place the data file in the DistributedCache and read the data into memory in the configure method of the mapper.

正解：A 解答を投票する

質問 3

Given a directory of files with the following structure: line number, tab character, string:
Example: 1abialkjfjkaoasdfjksdlkjhqweroij 2kadfjhuwqounahagtnbvaswslmnbfgy 3kjfteiomndscxeqalkzhtopedkfsikj
You want to send each line as one record to your Mapper. Which InputFormat should you use to complete the line: conf.setInputFormat (____.class) ; ?

（A）KeyValueFileInputFormat

（B）SequenceFileAsTextInputFormat

（C）SequenceFileInputFormat

（D）BDBInputFormat

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 4

Which one of the following statements is false about HCatalog?

（A）Provides a shared schema mechanism

（B）Exists as a subproject of Hive

（C）Designed to be used by other programs such as Pig, Hive and MapReduce

（D）Stores HDFS data in a database for performing SQL-like ad-hoc queries

正解：D 解答を投票する

質問 5

You have the following key-value pairs as output from your Map task: (the, 1)
(fox, 1)
(faster, 1)
(than, 1)
(the, 1)
(dog, 1)
How many keys will be passed to the Reducer's reduce method?

（A）Six

（B）Five

（C）Three

（D）Four

（E）One

（F）Two

正解：B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 6

In Hadoop 2.2, which one of the following statements is true about a standby NameNode?
The Standby NameNode:

（A）Communicates directly with the active NameNode to maintain the state of the active NameNode.

（B）Processes all client requests and block reports from the appropriate DataNodes.

（C）Runs on the same machine and shares the memory of the active NameNode.

（D）Receives the same block reports as the active NameNode.

正解：D 解答を投票する

質問 7

Which HDFS command displays the contents of the file x in the user's HDFS home directory?

（A）hadoop fs -cat x

（B）hdfs fs -get x

（C）hadoop fs -cp x

（D）hadoop fs -Is x

正解：A 解答を投票する

質問 8

You want to run Hadoop jobs on your development workstation for testing before you submit them to your production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production cluster while using a single machine?

（A）Run all the nodes in your production cluster as virtual machines on your development workstation.

（B）Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.

（C）Run the hadoop command with the -jt local and the -fs file:///options.

（D）Run simldooop, the Apache open-source software for simulating Hadoop clusters.

正解：B 解答を投票する

質問 9

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）None, the directory cannot be named jobdata

（B）Three, the pound sign is an invalid character for HDFS file names

（C）Two, file names with a leading period or underscore are ignored

（D）Four, all files will be processed

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

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 10

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）5

（C）1

（D）6

（E）0

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

HDPCD 無料問題集「Hortonworks Data Platform Certified Developer」

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