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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. How does the NameNode detect that a DataNode has failed?

A) When the NameNode fails to receive periodic heartbeats from the DataNode, it considers the DataNode as failed.
B) When HDFS starts up, the NameNode tries to communicate with the DataNode and considers the DataNode as failed if it does not respond.
C) The NameNode periodically pings the datanode. If the DataNode does not respond, the NameNode considers the DataNode as failed.
D) The NameNode does not need to know that a DataNode has failed.

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

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

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

4. 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) BDBInputFormat
B) SequenceFileInputFormat
C) SequenceFileAsTextInputFormat
D) KeyValueTextInputFormat

5. Given a Mapper, Reducer, and Driver class packaged into a jar, which is the correct way of submitting the job to the cluster?

A) hadoop jar MyJar.jar MyDriverClass inputdir outputdir
B) hadoop jar class MyJar.jar MyDriverClass inputdir outputdir
C) jar MyJar.jar
D) jar MyJar.jar MyDriverClass inputdir outputdir

Solutions: