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Updated: Sep 06, 2025
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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 of homogeneous Writable objects
D) 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.
2. Which one of the following statements describes the relationship between the NodeManager and the ApplicationMaster?
A) The ApplicationMaster starts the NodeManager outside of a Container
B) The NodeManager creates an instance of the ApplicationMaster
C) The NodeManager requests resources from the ApplicationMaster
D) The ApplicationMaster starts the NodeManager in a Container
3. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:
A) The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.
B) Neither keys nor values are in any predictable order.
C) Both the keys and values passed to a reducer always appear in sorted order.
D) The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order
4. 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) Mapper <Text, IntWritable, Text, IntWritable>
B) Combiner <Text, IntWritable, Text, IntWritable>
C) Reducer <Text, Text, IntWritable, IntWritable>
D) Combiner <Text, Text, IntWritable, IntWritable>
E) Reducer <Text, IntWritable, Text, IntWritable>
5. You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses TextInputFormat: the mapper applies a regular expression over input values and emits key-values pairs with the key consisting of the matching text, and the value containing the filename and byte offset. Determine the difference between setting the number of reduces to one and settings the number of reducers to zero.
A) There is no difference in output between the two settings.
B) With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of matching patterns are stored in a single file on HDFS.
C) With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one reducer, all instances of matching patterns are gathered together in one file on HDFS.
D) With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With one reducer, instances of matching patterns are stored in multiple files on HDFS.
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: D | Question # 4 Answer: E | Question # 5 Answer: C |
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