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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. You want to understand more about how users browse your public website, such as which pages they
visit prior to placing an order. You have a farm of 200 web servers hosting your website. How will you
gather this data for your analysis?

A) Import all users' clicks from your OLTP databases into Hadoop, using Sqoop.
B) Channel these clickstreams inot Hadoop using Hadoop Streaming.
C) Sample the weblogs from the web servers, copying them into Hadoop using curl.
D) Write a MapReduce job, with the web servers for mappers, and the Hadoop cluster nodes for reduces.
E) Ingest the server web logs into HDFS using Flume.

2. Given a directory of files with the following structure:
line number, tab character, string:
Example:
1 abialkjfjkaoasdfjksdlkjhqweroij
2 kadfjhuwqounahagtnbvaswslmnbfgy
3 kjfteiomndscxeqalkzhtopedkfsikj
You want to send each line as one record to your Mapper. Which InputFormat should you use to complete
the line: conf.setInputFormat (____.class) ; ?

A) SequenceFileAsTextInputFormat
B) SequenceFileInputFormat
C) KeyValueFileInputFormat
D) BDBInputFormat

3. You use the hadoop fs -put command to write a 300 MB file using and HDFS block size of 64 MB. Just
after this command has finished writing 200 MB of this file, what would another user see when trying to
access this life?

A) They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file.
B) They would see the current state of the file, up to the last bit written by the command.
C) They would see the current of the file through the last completed block.
D) They would see no content until the whole file written and closed.

4. Which one of the following statements is true regarding a MapReduce job?

A) The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers
B) The Mapper must sort its output of (key.value) pairs in descending order based on value
C) The default Hash Partitioner sends key value pairs with the same key to the same Reducer
D) The reduce method is invoked once for each unique value

5. Consider the following two relations, A and B.

What is the output of the following Pig commands?
X = GROUP A BY S1; DUMP X;