Hadoop Online Quiz

Q 1 - As compared to RDBMS, Hadoop

A - Has higher data Integrity.

B - Does ACID transactions

C - IS suitable for read and write many times

D - Works better on unstructured and semi-structured data.

Q 2 - As part of the HDFS high availability a pair of primary namenodes are configured. What is true for them?

A - When a client request comes, one of them chosen at random serves the request.

B - One of them is active while the other one remains powered off.

C - Datanodes send block reports to only one of the namenodes.

D - The standby node takes periodic checkpoints of active namenode’s namespace.

Q 3 - For a HDFS directory the replication factor(RF) is

A - same as the RF of the files in that directory

B - Zero

C - 3

D - Does not apply.

Q 4 - The file in Namenode which stores the information mapping the data block location with file name is −

A - dfsimage

B - nameimage

C - fsimage

D - image

Q 5 - In the secondary namenode the amount of memory needed is

A - Similar to that of primary node

B - Should be at least half of the primary node

C - Must be double of that of primary node

D - Depends only on the number of data nodes it is going to handle

Q 6 - When a backup node is used in a cluster there is no need of

A - Check point node

B - Secondary name node

C - Secondary data node

D - Rack awareness

Q 7 - hadoop fs –expunge

A - Gives the list of datanodes

B - Used to delete a file

C - Used to exchange a file between two datanodes.

D - Empties the trash.

Q 8 - Which of the following is not a scheduling option available in YARN

A - Balanced scheduler

B - Fair scheduler

C - Capacity scheduler

D - FiFO schesduler.

Q 9 - What is distributed cache?

A - The distributed cache is special component on name node that will cache frequently used data for faster client response. It is used during reduce step.

B - The distributed cache is special component on data node that will cache frequently used data for faster client response. It is used during map step.

C - The distributed cache is a component that caches java objects.

D - The distributed cache is a component that allows developers to deploy jars for Map-Reduce processing.

Q 10 - In order to apply a combiner, what is one property that has to be satisfied by the values emitted from the mapper?

A - Combiner can be applied always to any data

B - Output of the mapper and output of the combiner has to be same key value pair and they can be heterogeneous

C - Output of the mapper and output of the combiner has to be same key value pair. Only if the values satisfy associative and commutative property it can be done.