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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Which of the Following best describes the lifecycle of a Mapper?

A) The JobTracker calls the FastTracker's configure () method, then its map () method and finally its closer ()
B) The JobTracker spawns a new Mapper to process all records in a single file.
C) The TaskTracker spawns a new Mapper to process all records in a single input split.
D) The TaskTracker spawns a new Mapper to process each key-value pair.

2. You use the hadoop fs -put command to write a 300 MB file using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this file?

A) They would see Hadoop throw an concurrentFileAccessException when they try to access this file.
B) They would see the content of the file through the last completed block.
C) They would see no content until the whole file is written and closed.
D) They would see the current state of the file, up to the last bit written by the command.

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

A) Setting the number of reducers to one is invalid, and an exception is thrown.
B) Setting the number of reducers to one creates a processing bottleneck, and since the number of reducers as specified by the programmer is used as a reference value only, the MapReduce runtime provides a default setting for the number of reducers.
C) A single reducer gathers and processes all the output from all the mappers. The output is written in as many separate files as there are mappers.
D) A single reducer gathers and processes all the output from all the mappers. The output is written to a single file in HDFS.

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

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

5. For each input key-value pair, mappers can emit:

A) One intermediate key value pair, of a different type.
B) As many intermediate key value pairs as desired, as long as all the keys have the same type and all the values have the same type.
C) One intermediate key value pair, but of the same type.
D) As many intermediate key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
E) As many intermediate key-value pairs as desired, but they cannot be of the same type as the input key-value pair.

Solutions: