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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which happens if the NameNode crashes?

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

2. Which of the following best describes the map method input and output?

A) It accepts a single key-value pair as input and can emit only one key-value pair as output.
B) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output
C) It accepts a single key-value pair as input and can emit any number of key-value pairs as output, including zero.
D) It accepts a list of key-value pairs as input hut run emit only one key value pair as output.

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 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 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.
D) 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.

4. You have an employee who is a Date Analyst and is very comfortable with SQL. He would like to run ad-hoc analysis on data in your HDFS duster. Which of the following is a data warehousing software built on top of Apache Hadoop that defines a simple SQL-like query language well-suited for this kind of user?

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

5. Which of the following best describes the workings of TextInputFormat?

A) Input file splits may cross line breaks. A line that crosses tile splits is ignored.
B) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.
C) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.
D) The input file is split exactly at the line breaks, so each Record Reader will read a series of complete lines.
E) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.

Solutions: