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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. What types of algorithms are difficult to express MapReduce?

A) Algorithms that require applying the same mathematical function to large numbers of individual binary records.
B) Algorithms that requite global, shared state.
C) Text analysis algorithms on large collections of unstructured text (e.g., Web crawls).
D) Relational operations on large amounts of structured and semi structured data.
E) Large-scale graph algorithms that require one-step link traversal.

2. What is a Writable?

A) Writable is an abstract class that all keys, but not values, in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves.
B) Writable is an interface that all keys and values in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
C) Writable is an interface that all keys, but not values, in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
D) Writable is an abstract class that all keys and values in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves

3. Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication settings. What is the storage capacity of your Hadoop cluster (assuming no compression)?

A) about 5 TB
B) about 10 TB
C) about 11 TB
D) about 3 TB

4. What is a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
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 WritableComparable objects, in sorted order.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.

5. For each intermediate key, each reducer task can emit:

A) One final key-value pair per value associated with the key; no restrictions on the type.
B) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.
C) As many final key value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous)
D) One final key value pair per key; no restrictions on the type.
E) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.

Solutions: