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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which happens if the NameNode crashes?

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

2. Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication settings. What is the storage capacity of your Hadoop cluster (assuming no compression)?

A) about 11 TB
B) about 5 TB
C) about 3 TB
D) about 10 TB

3. In the standard word count MapReduce algorithm, why might using a combiner reduce the overall Job running time?

A) Because combiners perform local aggregation of word counts, thereby reducing the number of key-value pairs that need to be snuff let across the network to the reducers.
B) Because combiners perform local aggregation of word counts, thereby reducing the number of mappers that need to run.
C) Because combiners perform local aggregation of word counts, and then transfer that data to reducers without writing the intermediate data to disk.
D) Because combiners perform local aggregation of word counts, thereby allowing the mappers to process input data faster.

4. What is a Writable?

A) Writable is an abstract class that all keys, but not values, in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves.
B) Writable is an interface that all keys and values in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
C) Writable is an abstract class that all keys and values in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves
D) Writable is an interface that all keys, but not values, in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.

5. Which of the following utilities allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer?

A) Oozie
B) Flume
C) Sqoop
D) Hadoop Streaming

Solutions: