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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. In a MapReduce job with 500 map tasks, how many map task attempts will there be?

A) Exactly 500.
B) At least 500.
C) Between 500 and 1000.
D) At most 500.
E) It depends on the number of reducers in the job.

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

3. During the standard sort and shuffle phase of MapReduce, keys and values are passed to reducers. Which of the following is true?

A) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
B) Keys are presented to a reducer in sorted order; values for a given key are not sorted.
C) Keys are presented to a reducer in random order; values for a given key are not sorted.
D) Keys are presented to a reducer in soiled order; values for a given key are sorted in ascending order.

4. 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 current state of the file, up to the last bit written by the command.
C) They would see no content until the whole file is written and closed.
D) They would see the content of the file through the last completed block.

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

Solutions: