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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, Intwritable values. Which interface should your class implement?

A) Reducer <Text, IntWritable, Text, IntWritable>
B) Combiner <Text, IntWritable, Text, IntWritable>
C) Reducer <Text, Text, IntWritable, IntWritable>
D) Combiner <Text, Text, IntWritable, IntWritable>
E) Mapper <Text, IntWritable, Text, IntWritable>

2. You have written a Mapper which invokes the following five calls to the outputcollector.collect method:

How many times will the Reducer's reduce method be invoked.

A) 1
B) 5
C) 6
D) 3
E) 0

3. In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:

A) Returns a reference to the same writable object each time, but populated with different data.
B) Returns a reference to the same writable object if the next value is the same as the previous value, or a new writable object otherwise.
C) Returns a reference to a Writable object from an object pool.
D) Returns a reference to a different Writable object each time.
E) Returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.

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

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: