Given below the Hadoop MapReduce practice test includes many questions, which will help you to crack Hadoop developer interview, Hadoop admin interview, Big Data Hadoop Interview and many more.
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Question 1 of 20
Is it mandatory to set input and output type/format in Hadoop MapReduce?
Question 2 of 20
HashPartitioner uses which method to determine, to which partition a given (key, value) pair will be sent
hash.Code() hashcodepatition() hashCode() hashpatition()
Question 3 of 20
Which of the following permits to use multiple Mapper classes within a single Map task
Identity Mapper Chain Mapper Both the above
Question 4 of 20
Identity Reducer is the default Reducer provided by Hadoop
Question 5 of 20
The parameters for Mappers are:
text (input) LongWritable(input) text (intermediate output) All of the above
Question 6 of 20
The parameters for Reducers are:
text (intermediate output) IntWritable (intermediate output) IntWritable (final output) All of the above
Question 7 of 20
Hadoop framework invokes Splitting of the file by running which of the following method
getSplit() get.InputSplit() getInputSplit() getInputSplit(int)
Question 8 of 20
For 514 MB file how many InputSplit will be created
Question 9 of 20
Which among the following is used to provide multiple inputs to Hadoop?
MultipleInputs class MultipleInputFormat FileInputFormat DBInputFormat
Question 10 of 20
Which statement is true about EditLogs
Contains the entire filesystem namespace Contains all recent modifications made to the file system of most recent FsImage Contains a serialized form of all the directories All of the above
Question 11 of 20
Identity Mapper is the default Mapper in Hadoop
Question 12 of 20
Which among following class is responsible for converting inputs to key-value Pairs?
FileInputFormat InputSplit RecordReader Mapper
Question 13 of 20
What is the most common OutputFormat in Hadoop
TextOutputFormat SequenceFileOutputFormat MapFileOutputFormat All of the above
Question 14 of 20
Is it mandatory to set input and output type/format in MapReduce?
Question 15 of 20
Which of the following is used to set mappers for MapReduce jobs?
job.setNumMaptasks() job.setNum.Maptasks() job.setNumMap.tasks() job.setNumMap()
Question 16 of 20
Which of the following is used set reducers for MapReduce jobs?
job.setNumreduce.tasks() job.setNum.Maptasks() job.setNumreduceTasks() job.setNumreduce()
Question 17 of 20
Which of the following is the correct sequence of MapReduce flow?
Map>Combine> Reduce Combine>Reduce>Map Map>Reduce>Combine Reduce>Combine>Map
Question 18 of 20
The process by which the system performs the sort and transfers the map outputs to the reducer as inputs is known as
Sorting Shuffling Aggregation Summation
Question 19 of 20
Which of the following is used to make sure that all the value of a single key goes to the same reducer
Combiner Reducer Partitioner Mapper
Question 20 of 20
Which of the following is the default Partitioner for partitioning keyspace.
HashPar Partitioner HashPartitioner None of the above
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Q.19 Which of the following is used to make sure that all the value of a single key goes to the same reducer
I think the answer for this question is Partitioner not the Combiner
I think that too.
i think so too
yes you right, i think so that too