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

1. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

A) Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
B) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
C) Keys are presented to reducer in sorted order; values for a given key are not sorted.
D) Keys are presented to a reducer in random order; values for a given key are not sorted.

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

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

A) Option D
B) Option A
C) Option C
D) Option B

3. A combiner reduces:

A) The number of values across different keys in the iterator supplied to a single reduce method call.
B) The amount of intermediate data that must be transferred between the mapper and reducer.
C) The number of output files a reducer must produce.
D) The number of input files a mapper must process.

4. You need to run the same job many times with minor variations. Rather than hardcoding all job
configuration options in your drive code, you've decided to have your Driver subclass
org.apache.hadoop.conf.Configured and implement the org.apache.hadoop.util.Tool interface.
Indentify which invocation correctly passes.mapred.job.name with a value of Example to Hadoop?

A) hadoop MyDrive -D mapred.job.name=Example input output
B) hadoop MyDriver mapred.job.name=Example input output
C) hadoop setproperty mapred.job.name=Example MyDriver input output
D) hadoop setproperty ("mapred.job.name=Example") MyDriver input output
E) hadoop "mapred.job.name=Example" MyDriver input output

5. Table metadata in Hive is:

A) Stored along with the data in HDFS.
B) Stored as metadata on the NameNode.
C) Stored in ZooKeeper.
D) Stored in the Metastore.

Solutions: