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

2. You've written a MapReduce job that will process 500 million input records and generate 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reducers which is a potential bottleneck. A custom implementation of which of the following interfaces is most likely to reduce the amount of intermediate data transferred across the network?

A) Combiner
B) InputFormat
C) WritableComparable
D) Partitioner
E) OutputFormat
F) Writable

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

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

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

5. Which of the following best describes the workings of TextInputFormat?

A) The input file is split exactly at the line breaks, so each Record Reader will read a series of complete lines.
B) 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.
C) Input file splits may cross line breaks. A line that crosses tile splits is ignored.
D) 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.
E) 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.

Solutions: