1. Hadoop I/O Hadoop comes with a set of ________ for data I/O.

a) methods

b) commands

c) classes

d) None of the mentioned


2. Point out the correct statement :

a) The sequence file also can contain a “secondary” key-value list that can be used as file Metadata

b) SequenceFile formats share a header that contains some information which allows the reader to recognize is format

c) There’re Key and Value Class Name’s that allow the reader to instantiate those classes, via reflection, for reading

d) All of the mentioned


3. Apache Hadoop’s ___________ provides a persistent data structure for binary key-value pairs.

a) GetFile

b) SequenceFile

c) Putfile

d) All of the mentioned

4. How many formats of SequenceFile are present in Hadoop I/O ?

a) 2

b) 3

c) 4

d) 5


5. Point out the wrong statement :

a) The data file contains all the key, value records but key N + 1 must be greater then or equal to the key N

b) Sequence file is a kind of hadoop file based data structure

c) Map file type is splittable as it contains a sync point after several records

d) None of the mentioned

6. Which of the following format is more compression-aggressive ?

a) Partition Compressed

b) Record Compressed

c) Block-Compressed

d) Uncompressed


7. The __________ is a directory that contains two SequenceFile.

a) ReduceFile

b) MapperFile

c) MapFile

d) None of the mentioned


8. The ______ file is populated with the key and a LongWritable that contains the starting byte position of the record.

a) Array

b) Index

c) Immutable

d) All of the mentioned


9. The _________ as just the value field append(value) and the key is a LongWritable that contains the record number, count + 1.

a) SetFile

b) ArrayFile

c) BloomMapFile

d) None of the mentioned


10. ____________ data file takes is based on avro serializaton framework which was primarily created for hadoop.

a) Oozie

b) Avro

c) cTakes

d) Lucene