Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) 認定 HADOOP-PR000007 試験問題:

1. When is the earliest point at which the reduce method of a given Reducer can be called?

A) As soon as at least one mapper has finished processing its input split.
B) It depends on the InputFormat used for the job.
C) As soon as a mapper has emitted at least one record.
D) Not until all mappers have finished processing all records.

2. What types of algorithms are difficult to express in MapReduce v1 (MRv1)?

A) Large-scale graph algorithms that require one-step link traversal.
B) Relational operations on large amounts of structured and semi-structured data.
C) Text analysis algorithms on large collections of unstructured text (e.g, Web crawls).
D) Algorithms that require global, sharing states.
E) Algorithms that require applying the same mathematical function to large numbers of individual binary
records.

3. To use a lava user-defined function (UDF) with Pig what must you do?

A) Pass arguments to the constructor of UDFs implementation class
B) Put the JAR file into the user's home folder in HDFS
C) Register the JAR file containing the UDF
D) Define an alias to shorten the function name

4. What is the disadvantage of using multiple reducers with the default HashPartitioner and distributing your
workload across you cluster?

A) By using multiple reducers with the default HashPartitioner, output files may not be in globally sorted
order.
B) You will not be able to compress the intermediate data.
C) You will longer be able to take advantage of a Combiner.
D) There are no concerns with this approach. It is always advisable to use multiple reduces.

5. Which one of the following statements is false about HCatalog?

A) Exists as a subproject of Hive
B) Provides a shared schema mechanism
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

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