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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. 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) Sqoop
B) Flume
C) Oozie
D) Hadoop Streaming

2. Which of the following describes how a client reads a file from HDFS?

A) The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode redirects the client to the DataNode that holds the requested data block(s). The client then reads the data directly off the DataNode.
B) The client queries the NameNode for the block location(s). The NameNode returns the block location(s) to the client. The client reads the data directly off the DataNode(s).
C) The client contacts the NameNode for the block location(s). The NameNode contacts theDataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.
D) The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly off the DataNode.

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

A) When HDFS starts up, the NameNode tries to communicate with the DataNode and considers the DataNode as failed if it does not respond.
B) When the NameNode fails to receive periodic heartbeats from the DataNode, it considers the DataNode as failed.
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.

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

5. You are running a job that will process a single InputSplit on a cluster which has no other jobs currently running. Each node has an equal number of open Map slots. On which node will Hadoop first attempt to run the Map task?

A) The node with the most memory
B) The node on which this InputSplit is stored
C) The node with the most free local disk space
D) The node with the lowest system load

Solutions: