Engineering Questions with Answers - Multiple Choice Questions
MCQs on Hadoop Archives
1 - Question
_________ is the name of the archive you would like to create.
a) archive
b) archiveName
c) name
d) none of the mentioned
View Answer
Answer: b
Explanation: The name should have a *.har extension.
2 - Question
Point out the correct statement.
a) A Hadoop archive maps to a file system directory
b) Hadoop archives are special format archives
c) A Hadoop archive always has a *.har extension
d) All of the mentioned
View Answer
Answer: d
Explanation: A Hadoop archive directory contains metadata (in the form of _index and _masterindex) and data (part-*) files.
3 - Question
Using Hadoop Archives in __________ is as easy as specifying a different input filesystem than the default file system.
a) Hive
b) Pig
c) MapReduce
d) All of the mentioned
View Answer
Answer: c
Explanation: Hadoop Archives is exposed as a file system MapReduce will be able to use all the logical input files in Hadoop Archives as input.
4 - Question
The __________ guarantees that excess resources taken from a queue will be restored to it within N minutes of its need for them.
a) capacitor
b) scheduler
c) datanode
d) none of the mentioned
View Answer
Answer: b
Explanation: Free resources can be allocated to any queue beyond its guaranteed capacity.
5 - Question
Point out the wrong statement.
a) The Hadoop archive exposes itself as a file system layer
b) Hadoop archives are immutable
c) Archive rename, deletes and creates return an error
d) None of the mentioned
View Answer
Answer: d
Explanation: All the fs shell commands in the archives work but with a different URI.
6 - Question
_________ is a pluggable Map/Reduce scheduler for Hadoop which provides a way to share large clusters.
a) Flow Scheduler
b) Data Scheduler
c) Capacity Scheduler
d) None of the mentioned
View Answer
Answer: c
Explanation: The Capacity Scheduler supports multiple queues, where a job is submitted to a queue.
7 - Question
Which of the following parameter describes destination directory which would contain the archive?
a) -archiveName <name>
b) <source>
c) <destination>
d) none of the mentioned
View Answer
Answer: c
Explanation: -archiveName <name> is the name of the archive to be created.
8 - Question
_________ identifies filesystem path names which work as usual with regular expressions.
a) -archiveName <name>
b) <source>
c) <destination>
d) none of the mentioned
View Answer
Answer: d
Explanation: identifies destination directory which would contain the archive.
9 - Question
__________ is the parent argument used to specify the relative path to which the files should be archived to
a) -archiveName <name>
b) -p <parent_path>
c) <destination>
d) <source>
View Answer
Answer: b
Explanation: The hadoop archive command creates a Hadoop archive, a file that contains other files.
10 - Question
Which of the following is a valid syntax for hadoop archive?
a)
hadooparchive [ Generic Options ] archive
-archiveName <name>
[-p <parent>]
<source>
<destination>
b)
hadooparch [ Generic Options ] archive
-archiveName <name>
[-p <parent>]
<source>
<destination>
c)
hadoop [ Generic Options ] archive
-archiveName <name>
[-p <parent>]
<source>
<destination>
d) None of the mentioned
View Answer
Answer: c
Explanation: The Hadoop archiving tool can be invoked using the following command format: hadoop archive -archiveName name -p <parent> <src>* <dest>.