最新的Hortonworks HADOOP-PR000007免費考試真題

問題1

What is a SequenceFile?

A. A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in
sorted order.

B. A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.

C. A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be
the same type. Each value must be same type.

D. A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.

正確答案: C

問題2

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

問題3

In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling
the next () method return?

A. It returns a reference to a Writable object from an object pool.

B. It returns a reference to the same Writable object if the next value is the same as the previous value, or
a new Writable object otherwise.

C. It returns a reference to a different Writable object time.

D. It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object
or a new object.

E. It returns a reference to the same Writable object each time, but populated with different data.

正確答案: E

問題4

You want to Ingest log files Into HDFS, which tool would you use?

A. HCatalog

B. Flume

C. Sqoop

D. Ambari

正確答案: B

問題5

Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A. The contents of File1 are parsed as comma-delimited rows and loaded into /user/joe/x/

B. The contents of File1 are parsed as comma-delimited rows and stored in a database

C. Hive reformats File1 into a structure that Hive can access and moves into to/user/joe/x/

D. The file named File1 is moved to to/user/joe/x/

正確答案: D

問題6

Which one of the following statements is true about a Hive-managed table?

A. Hive dynamically defines the schema of the table based on the format of the underlying data.

B. Records can only be added to the table using the Hive INSERT command.

C. When the table is dropped, the underlying folder in HDFS is deleted.

D. Hive dynamically defines the schema of the table based on the FROM clause of a SELECT query.

正確答案: C

問題7

Assuming the following Hive query executes successfully:

Which one of the following statements describes the result set?

A. A bigram of the top 80 sentences that contain the substring "you are" in the lines column of the input
data A1 table.

B. A frequency distribution of the top 80 words that follow the subsequence "you are" in the lines column
of the inputdata table.

C. A trigram of the top 80 sentences that contain "you are" followed by a null space in the lines column of
the inputdata table.

D. An 80-value ngram of sentences that contain the words "you" or "are" in the lines column of the
inputdata table.

正確答案: B

問題8

You are developing a MapReduce job for sales reporting. The mapper will process input keys
representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.

A. The mapper-specification.xml file submitted with the job determine the mapper's input key and value
types.

B. The InputFormat used by the job determines the mapper's input key and value types.

C. The data types specified in HADOOP_MAP_DATATYPES environment variable

D. The key and value types specified in the JobConf.setMapInputKeyClass and
JobConf.setMapInputValuesClass methods

正確答案: B

問題9

Given the following Hive command:
INSERT OVERWRITE TABLE mytable SELECT * FROM myothertable;
Which one of the following statements is true?

A. The contents of myothertable are appended to mytable

B. A new table named mytable is created, and the contents of myothertable are copied into mytable

C. The statement is not a valid Hive command

D. Any existing data in mytable will be overwritten

正確答案: D

問題10

What is the term for the process of moving map outputs to the reducers?

A. Combining

B. Shuffling and sorting

C. Reducing

D. Partitioning

正確答案: B

最新的Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) - HADOOP-PR000007免費考試真題

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