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

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

Which Pig statement combines A by its first field and B by its second field?

A) C = JOIN A SO, B $1;
B) C = JOIN A a1, B b2;
C) C = JOIN A by al, B by b2;
D) C = DOIN B BY a1, A by b2;

2. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys,
IntWritable values. Which interface should your class implement?

A) Combiner <Text, IntWritable, Text, IntWritable>
B) Reducer <Text, IntWritable, Text, IntWritable>
C) Combiner <Text, Text, IntWritable, IntWritable>
D) Reducer <Text, Text, IntWritable, IntWritable>
E) Mapper <Text, IntWritable, Text, IntWritable>

3. Which HDFS command copies an HDFS file named foo to the local filesystem as localFoo?

A) hadoop fs -get foo LocalFoo
B) hadoop fs -Is foo
C) hadoop fs -put foo LocalFoo
D) hadoop -cp foo LocalFoo

4. When can a reduce class also serve as a combiner without affecting the output of a MapReduce program?

A) When the signature of the reduce method matches the signature of the combine method.
B) Never. Combiners and reducers must be implemented separately because they serve different purposes.
C) Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.
D) When the types of the reduce operation's input key and input value match the types of the reducer's output key and output value and when the reduce operation is both communicative and associative.
E) Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.

5. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling
the next () method return?

A) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object
or a new object.
B) It returns a reference to a Writable object from an object pool.
C) It returns a reference to the same Writable object if the next value is the same as the previous value, or
a new Writable object otherwise.
D) It returns a reference to the same Writable object each time, but populated with different data.
E) It returns a reference to a different Writable object time.

Solutions: