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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. Indentify which best defines 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 of WritableComparable objects, in sorted order.
C) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be the same type.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects

2. Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in HDFS.

A) No, but it can be done with either Pig or Hive.
B) Yes, so long as both tables fit into memory.
C) No, MapReduce cannot perform relational operations.
D) Yes.
E) Yes, but only if one of the tables fits into memory

3. You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A) 5
B) 6
C) 1
D) 3
E) 0

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

5. A client application creates an HDFS file named foo.txt with a replication factor of 3. Identify which best describes the file access rules in HDFS if the file has a single block that is stored on data nodes A, B and C?

A) Each data node locks the local file to prohibit concurrent readers and writers of the file.
B) The file will be marked as corrupted if data node B fails during the creation of the file.
C) Each data node stores a copy of the file in the local file system with the same name as the HDFS file.
D) The file can be accessed if at least one of the data nodes storing the file is available.

Solutions: