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最新的 HCAHD Apache-Hadoop-Developer 免費考試真題:

1. Which two of the following statements are true about Pig's approach toward data? Choose 2 answers

A) Accepts tab-delimited text data only
B) Accepts only data that is defined by metadata tables stored in a database
C) Accepts only data that has a key/value pair structure
D) Accepts any data: structured or unstructured
E) Accepts data whether it has metadata or not

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

A) Stores HDFS data in a database for performing SQL-like ad-hoc queries
B) Designed to be used by other programs such as Pig, Hive and MapReduce
C) Exists as a subproject of Hive
D) Provides a shared schema mechanism

3. Examine the following Hive statements:

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

A) The output is guaranteed to be a single file with all the data sorted by age
B) Each reducer generates a file sorted by age
C) The SORT BY command causes only one reducer to be used
D) The output of each reducer is only the age column

4. Which HDFS command uploads a local file X into an existing HDFS directory Y?

A) hadoop fs-put X Y
B) hadoop scp X Y
C) hadoop fs -localPut X Y
D) hadoop fs -get X Y

5. 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 InputFormat used by the job determines the mapper's input key and value types.
B) The data types specified in HADOOP_MAP_DATATYPES environment variable
C) The key and value types specified in the JobConf.setMapInputKeyClass and JobConf.setMapInputValuesClass methods
D) The mapper-specification.xml file submitted with the job determine the mapper's input key and value types.

問題與答案：