Hadoop interview questions part 36
Hadoop interview questions part 36
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Total Questions: 20
1. Which of the following Hadoop streaming command option parameter is required ?
Correct Answer is : All of the mentioned
2. To set an environment variable in a streaming command use:
Correct Answer is : -cmdenv EXAMPLE_DIR=/home/example/dictionaries/
3. Point out the wrong statement :
Correct Answer is : CombineFileInputFormat does not compromise the speed at which it can process the input in a typical MapReduce job
4. The ________ option allows you to copy jars locally to the current working directory of tasks and automatically unjar the files.
Correct Answer is : archives
5. ______________ class allows the Map/Reduce framework to partition the map outputs based on certain key fields, not the whole keys.
Correct Answer is : KeyFieldBasedPartitioner
6. Which of the following class provides a subset of features provided by the Unix/GNU Sort ?
Correct Answer is : KeyFieldBasedComparator
7. Which of the following class is provided by Aggregate package ?
Correct Answer is : Reducer
8. .Hadoop has a library class, org.apache.hadoop.mapred.lib.FieldSelectionMapReduce, that effectively allows you to process text data like the unix ______ utility.
Correct Answer is : Cut
9. ___________ takes node and rack locality into account when deciding which blocks to place in the same split
Correct Answer is : CombineFileInputFormat
10. Point out the correct statement :
Correct Answer is : All of the mentioned
11. The key, a ____________ is the byte offset within the file of the beginning of the line.
Correct Answer is : LongWritable
12. _________ is the output produced by TextOutputFor mat, Hadoop default OutputFormat.
Correct Answer is : KeyValueTextOutputFormat
13. Point out the wrong statement :
Correct Answer is : SequenceFileAsTextInputFormat is a variant of SequenceFileInputFormat that retrieves the sequence file’s keys and values as opaque binary objects.
14. __________ is a variant of SequenceFileInputFormat that converts the sequence file’s keys and values to Text objects
Correct Answer is : SequenceFileAsTextInputFormat
15. __________ class allows you to specify the InputFormat and Mapper to use on a per-path basis.
Correct Answer is : MultipleInputs
16. ___________ is an input format for reading data from a relational database, using JDBC.
Correct Answer is : DBInputFormat
17. Which of the following is the default output format ?
Correct Answer is : TextOutputFormat
18. Which of the following writes MapFiles as output ?
Correct Answer is : SequenceFileAsBinaryOutputFormat
19. __________ storage is a solution to decouple growing storage capacity from compute capacity.
Correct Answer is : Archival
20. Point out the correct statement :
Correct Answer is : When there is enough space, block replicas are stored according to the storage type list
