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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. You need to import a portion of a relational database every day as files to HDFS, and generate Java classes to Interact with your imported data. Which of the following tools should you use to accomplish this?

A) Pig
B) Oozie
C) Hue
D) Flume
E) fuse-dfs
F) Hive
G) Sqoop

2. You have a large dataset of key-value pairs, where the keys are strings, and the values are integers. For each unique key, you want to identify the largest integer. In writing a MapReduce program to accomplish this, can you take advantage of a combiner?

A) Yes, but the number of unique keys must be known in advance.
B) Yes, as long as all the keys fit into memory on each node.
C) Yes.
D) Yes, as long as all the integer values that share the same key fit into memory on each node.
E) No, a combiner would not be useful in this case.

3. What is the difference between a failed task attempt and a killed task attempt?

A) A failed task attempt is a task attempt that threw an unhandled exception. A killed task attempt is one that was terminated by the JobTracker.
B) A failed task attempt is a task attempt that did not generate any key value pairs. A killed task attempt is a task attempt that threw an exception, and thus killed by the execution framework.
C) A failed task attempt is a task attempt that threw a RuntimeException (i.e., the task fails). A killed task attempt is a task attempt that threw any other type of exception (e.g., IOException); the execution framework catches these exceptions and reports them as killed.
D) A failed task attempt is a task attempt that completed, but with an unexpected status value. A killed task attempt is a duplicate copy of a task attempt that was started as part of speculative execution.

4. What is a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
B) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be same type.
C) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.

5. What is the preferred way to pass a small number of configuration parameters to a mapper or reducer?

A) Through a static variable in the MapReduce driver class (i.e., the class that submits the MapReduce job).
B) Using a plain text file via the Distributedcache, which each mapper or reducer reads.
C) As a custom input key-value pair passed to each mapper or reducer.
D) As key-value pairs in the jobconf object.

Solutions: