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2021 Oct CCD-410 exam answers
Q11. 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. SequenceFileAsTextInputFormat
B. SequenceFileInputFormat
C. KeyValueFileInputFormat
D. BDBInputFormat
Answer: B
Q12. 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 hadoop command with the –jt local and the –fs file:///options.
C. Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.
D. Run simldooop, the Apache open-source software for simulating Hadoop clusters.
Answer: A
Q13. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?
A. Keys are presented to reducer in sorted order; values for a given key are not sorted.
B. Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
C. Keys are presented to a reducer in random order; values for a given key are not sorted.
D. Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
Answer: A
Q14. Indentify the utility that allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer?
A. Oozie
B. Sqoop
C. Flume
D. Hadoop Streaming
E. mapred
Answer: D
Q15. In a MapReduce job, the reducer receives all values associated with same key. Which statement best describes the ordering of these values?
A. The values are in sorted order.
B. The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.
C. The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the same ordering.
D. Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
Answer: B
Most up-to-date CCD-410 actual test:
Q16. What is a SequenceFile?
A. A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
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 of WritableComparable objects, in sorted order.
D. 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.
Answer: D
Q17. You need to perform statistical analysis in your MapReduce job and would like to call methods in the Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is the best way to make this library available to your MapReducer job at runtime?
A. Have your system administrator copy the JAR to all nodes in the cluster and set its location in the HADOOP_CLASSPATH environment variable before you submit your job.
B. Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and then set the HTTP_JAR_URL environment variable to its location.
C. When submitting the job on the command line, specify the –libjars option followed by the JAR file path.
D. Package your code and the Apache Commands Math library into a zip file named JobJar.zip
Answer: C
Q18. 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. 6
B. 3
C. 1
D. 0
E. 5
Answer: B
Q19. Identify the tool best suited to import a portion of a relational database every day as files into HDFS, and generate Java classes to interact with that imported data?
A. Oozie
B. Flume
C. Pig
D. Hue
E. Hive
F. Sqoop
G. fuse-dfs
Answer: F
Q20. 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 different Writable object time.
B. It returns a reference to a Writable object from an object pool.
C. It returns a reference to the same Writable object each time, but populated with different data.
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 if the next value is the same as the previous value, or a new Writable object otherwise.
Answer: C