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Updated: Aug 27, 2025
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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:
1. 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 from an object pool.
B) It returns a reference to the same Writable object each time, but populated with different data.
C) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
D) 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.
E) It returns a reference to a different Writable object time.
2. When is the earliest point at which the reduce method of a given Reducer can be called?
A) Not until all mappers have finished processing all records.
B) As soon as at least one mapper has finished processing its input split.
C) It depends on the InputFormat used for the job.
D) As soon as a mapper has emitted at least one record.
3. You need to create a job that does frequency analysis on input data. You will do this by writing a Mapper that uses TextInputFormat and splits each value (a line of text from an input file) into individual characters. For each one of these characters, you will emit the character as a key and an InputWritable as the value. As this will produce proportionally more intermediate data than input data, which two resources should you expect to be bottlenecks?
A) Processor and network I/O
B) Processor and RAM
C) Disk I/O and network I/O
D) Processor and disk I/O
4. MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate
daemons? Select two.
A) Job coordination between the ResourceManager and NodeManager
B) Job scheduling/monitoring
C) Managing file system metadata
D) Resource management
E) Managing tasks
F) Heath states checks (heartbeats)
G) Launching tasks
H) MapReduce metric reporting
5. Review the following data and Pig code:
What command to define B would produce the output (M,62,95l02) when invoking the DUMP operator on B?
A) B = JOIN A BY (gender = = 'M' AND zip = = '95102');
B) B= GROUP A BY (zip = = '95102' AND gender = = 'M');
C) B= FOREACH A BY (gender = = 'M' AND zip = = '95102');
D) B = FILTER A BY (zip = = '95102' AND gender = = M");
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: C | Question # 4 Answer: B,D | Question # 5 Answer: D |
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