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 - When a client communicates with the HDFS file system, it needs to communicate with

A - only the namenode

B - only the data node

C - both the namenode and datanode

D - None of these

Q 3 - Which scenario demands highest bandwidth for data transfer between nodes in Hadoop?

A - Different nodes on the same rack

B - Nodes on different racks in the same data center.

C - Nodes in different data centers

D - Data on the same node.

Q 4 - Which of the below property gets configured on hdfs-site.xml ?

A - Replication factor

B - Directory names to store hdfs files.

C - Host and port where MapReduce task runs.

D - Java Environment variables.

Q 5 - The output of a mapper task is

A - The Key-value pair of all the records of the dataset.

B - The Key-value pair of all the records from the input split processed by the mapper

C - Only the sorted Keys from the input split

D - The number of rows processed by the mapper task.

Q 6 - The fully distributed mode of installation(without virtualization) needs a minimum of

A - 2 physical mashines

B - 3 Physical machines

C - 4 Physical machines

D - 1 Physical machine

Q 7 - All the files in a directory in HDFS can be merged together using

A - getmerge

B - putmerge

C - remerge

D - mergeall

Q 8 - The number of tasks a task tracker can accept depends on

A - Maximum memory available in the node

B - Not limited

C - Number of slots configured in it

D - As decided by the jobTracker

Q 9 - When using HDFS, what occurs when a file is deleted from the command line?

A - It is permanently deleted if trash is enabled.

B - It is placed into a trash directory common to all users for that cluster.

C - It is permanently deleted and the file attributes are recorded in a log file.

D - It is moved into the trash directory of the user who deleted it if trash is enabled.

Q 10 - Which of the following are among the duties of the Data Nodes in HDFS?

A - Maintain the file system tree and metadata for all files and directories.

B - None of the options is correct.

C - Control the execution of an individual map task or a reduce task. 

D - Store and retrieve blocks when told to by clients or the NameNode.

E - Manage the file system namespace.