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

2. In a MapReduce job, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?

A) The values are in sorted order.
B) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
C) The values are arbitrarily ordered, but multiple runs of the same MapReduce job will always have the same ordering.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

3. 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) The input file is split exactly at the line breaks, so each Record Reader will read a series of complete lines.
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 RecordReader of the split that contains the beginning of the broken line.
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.

4. The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task that finish first are used. This is called:

A) Default Partitioner
B) Combiner
C) IdentityReducer
D) IdentityMapper
E) Speculative Execution

5. Which of the following statements best describes how a large (100 GB) file is stored in HDFS?

A) The file is replicated three times by default. Eachcopy of the file is stored on a separate datanodes.
B) The master copy of the file is stored on a single datanode. The replica copies are divided into fixed-size blocks, which are stored on multiple datanodes.
C) The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default.HDFS guarantees that different blocks from the same file are never on the same datanode.
D) The file is divided into variable size blocks, which are stored on multiple data nodes. Each block is replicated three times by default.
E) The file is divided into fixed-size blocks, which are stored on multiple datanodes. Each block is replicated three times by default. Multiple blocks from the same file might reside on the same datanode.

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