Hadoop Online Quiz

Q 1 - A file in HDFS that is smaller than a single block size

A - Cannot be stored in HDFS.

B - Occupies the full block's size.

C - Occupies only the size it needs and not the full block.

D - Can span over multiple blocks.

Q 2 - The main goal of HDFS High availability is

A - Faster creation of the replicas of primary namenode.

B - To reduce the cycle time required to bring back a new primary namenode after existing primary fails.

C - Prevent data loss due to failure of primary namenode.

D - Prevent the primary namenode form becoming single point of failure.

Q 3 - The client reading the data from HDFS filesystem in Hadoop

A - gets the data from the namenode

B - gets the block location from the datanode

C - gets only the block locations form the namenode

D - gets both the data and block location from the namenode

Q 4 - The information mapping data blocks with their corresponding files is stored in

A - Data node

B - Job Tracker

C - Task Tracker

D - Namenode

Q 5 - In Hadoop, Snappy and LZO are examples of

A - Mechanisms of file transport between data nodes

B - Mechanisms of data compression

C - Mechanisms of data Replication

D - Mechanisms of Data synchronization

Q 6 - Rack awareness in name node means

A - It is aware how many racks are available in the cluster

B - It is aware of the mapping between the node and the rack

C - It is aware of the number of nodes in each of the rack

D - It is aware which data nodes are unavailable in the cluster.

Q 7 - When you increase the number of files stored in HDFS, The memory required by namenode

A - Increases

B - Decreases

C - Remains unchanged

D - May increase or decrease

Q 8 - What is the default input format?

A - The default input format is xml. Developer can specify other input formats as appropriate if xml is not the correct input.

B - There is no default input format. The input format always should be specified.

C - The default input format is a sequence file format. The data needs to be preprocessed before using the default input format.

D - The default input format is TextInputFormat with byte offset as a key and entire line as a value.

Q 9 - Which technology is used to import and export data in Hadoop?

A - HBase

B - Avro

C - Sqoop

D - Zookeeper

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.