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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. All keys used for intermediate output from mappers must do which of the following:

A) Use a comparator for speedy sorting
B) Be a subclass of Filelnput-Format
C) Override isSplitable
D) Implement WritableComparable
E) Be compressed using a splittable compression algorithm.

2. In the standard word count MapReduce algorithm, why might using a combiner reduce the overall Job running time?

A) Because combiners perform local aggregation of word counts, and then transfer that data to reducers without writing the intermediate data to disk.
B) Because combiners perform local aggregation of word counts, thereby reducing the number of mappers that need to run.
C) Because combiners perform local aggregation of word counts, thereby reducing the number of key-value pairs that need to be snuff let across the network to the reducers.
D) Because combiners perform local aggregation of word counts, thereby allowing the mappers to process input data faster.

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

4. 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 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.
D) 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.

5. 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 of heterogeneous writable objects.
C) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
D) 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.

Solutions: