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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. You need a distributed, scalable, data Store that allows you random, realtime read/write access to hundreds of terabytes of data. Which of the following would you use?

A) Oozie
B) Hue
C) Pig
D) Flume
E) Hive
F) Sqoop
G) HBase

2. For each input key-value pair, mappers can emit:

A) One intermediate key value pair, of a different type.
B) One intermediate key value pair, but of the same type.
C) As many intermediate key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
D) As many intermediate key-value pairs as desired, but they cannot be of the same type as the input key-value pair.
E) As many intermediate key value pairs as desired, as long as all the keys have the same type and all the values have the same type.

3. Given a directory of files with the following structure: line number, tab character, string:
Example:
1.abialkjfjkaoasdfjksdlkjhqweroij
2.kadf jhuwqounahagtnbvaswslmnbfgy
3.kjfteiomndscxeqalkzhtopedkfslkj
You want to send each line as one record to your Mapper. Which InputFormat would you use to complete the line: setInputFormat (________.class);

A) SequenceFileAsTextInputFormat
B) KeyValueTextInputFormat
C) SequenceFileInputFormat
D) BDBInputFormat

4. What is the preferred way to pass a small number of configuration parameters to a mapper or reducer?

A) Using a plain text file via the Distributedcache, which each mapper or reducer reads.
B) As key-value pairs in the jobconf object.
C) As a custom input key-value pair passed to each mapper or reducer.
D) Through a static variable in the MapReduce driver class (i.e., the class that submits the MapReduce job).

5. Which happens if the NameNode crashes?

A) HDFS becomes temporarily unavailable until an administrator starts redirecting client requests to the Secondary NameNode.
B) HDFS becomes unavailable until the NameNode is restored.
C) HDFS becomes unavailable to new MapReduce jobs, but running jobs will continue until completion.
D) The Secondary NameNode seamlessly takes over and there is no service interruption.

Solutions: