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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. You need to import a portion of a relational database every day as files to HDFS, and generate Java classes to Interact with your imported data. Which of the following tools should you use to accomplish this?

A) Sqoop
B) Flume
C) Oozie
D) Hive
E) fuse-dfs
F) Pig
G) Hue

2. Which happens if the NameNode crashes?

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

3. 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 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.
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 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).

4. What happens in a MapReduce job when you set the number of reducers to zero?

A) No reducer executes, but the outputs of all the mappers are gathered together and written to a single file in HDFS.
B) Setting the number of reducers to zero is invalid, and an exception is thrown.
C) No reducer executes, but the mappers generate no output.
D) No reducer executes, and the output of each mapper is written to a separate file in HDFS.

5. You need to create a GUI application to help your company's sales people add and edit customer information. Would HDFS be appropriate for this customer information file?

A) No, because HDFS is optimized for write-once, streaming access for relatively large files.
B) Yes, because HDFS is optimized for fast retrieval of relatively small amounts of data.
C) Yes, because HDFS is optimized for random access writes.
D) No, because HDFS can only be accessed by MapReduce applications.

Solutions: