Apache-Hadoop-Developer問題集、Hortonworks実際の試験問題

質問 1

Examine the following Pig commands:

Which one of the following statements is true?

A. Each MapReduce task will terminate after executing for 0.2 minutes

B. The reducers will only output the first 20% of the data passed from the mappers

C. A random sample of approximately 20% of the data will be output

D. The SAMPLE command generates an "unexpected symbol" error

正解: C

質問 2

Which one of the following statements regarding the components of YARN is FALSE?

A. A client application submits a YARW job to the ResourceManager

B. The ResourceManager is responsible for scheduling and allocating resources

C. The ResourceManager monitors and restarts any failed Containers

D. A Container executes a specific task as assigned by the ApplicationMaster

正解: C

質問 3

Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A. Both the keys and values passed to a reducer always appear in sorted order.

B. The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.

C. Neither keys nor values are in any predictable order.

D. The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order

正解: D

解説: (PassTest メンバーにのみ表示されます)

質問 4

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

A. hadoop fs -Is x

B. hdfs fs -get x

C. hadoop fs -cp x

D. hadoop fs -cat x

正解: D

質問 5

When can a reduce class also serve as a combiner without affecting the output of a MapReduce program?

A. Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.

B. When the signature of the reduce method matches the signature of the combine method.

C. Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.

D. Never. Combiners and reducers must be implemented separately because they serve different purposes.

E. When the types of the reduce operation's input key and input value match the types of the reducer's output key and output value and when the reduce operation is both communicative and associative.

正解: E

解説: (PassTest メンバーにのみ表示されます)

質問 6

Which one of the following statements describes a Pig bag. tuple, and map, respectively?

A. Ordered collection of maps, ordered collection of bags, and unordered set of key/value pairs

B. Unordered collection of tuples, ordered set of fields, set of key value pairs

C. Unordered collection of maps, ordered collection of tuples, ordered set of key/value pairs

D. Ordered set of fields, ordered collection of tuples, ordered collection of maps

正解: B

質問 7

Which two of the following are true about this trivial Pig program' (choose Two)

A. The contents of myfile appear on stdout

B. ABC has a schema associated with it

C. Pig assumes the contents of myfile are comma delimited

D. myfile is read from the user's home directory in HDFS

正解: A,D

Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer - Apache-Hadoop-Developer 模擬練習