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 - In the local disk of the namenode the files which are stored persistently are −

A - namespace image and edit log

B - block locations and namespace image

C - edit log and block locations

D - Namespace image, edit log and block locations.

Q 3 - When running on a pseudo distributed mode the replication factor is set to

A - 2

B - 1

C - 0

D - 3

Q 4 - When the namenode finds that some blocks are over replicated, it

A - Stops the replication job in the entire hdfs file system.

B - It slows down the replication process for those blocks

C - It deletes the extra blocks.

D - It leaves the extra blocks as it is.

Q 5 - The nature of hardware for the namenode should be

A - Superior than commodity grade

B - Commodity grade

C - Does not matter

D - Just have more Ram than each of the data nodes

Q 6 - Which of the following is not a goal of HDFS?

A - Fault detection and recovery

B - Handle huge dataset

C - Prevent deletion of data

D - Provide high network bandwidth for data movement

Q 7 - The comman used to copy a directory form one node to another in HDFS is

A - rcp

B - dcp

C - drcp

D - distcp

Q 8 - The heartbeat signal are sent from

A - JObtracker to Tasktracker

B - Tasktracker to Job tracker

C - Jobtracker to namenode

D - Tasktracker to namenode

Q 9 - What is HBASE?

A - Hbase is separate set of the Java API for Hadoop cluster.

B - Hbase is a part of the Apache Hadoop project that provides interface for scanning large amount of data using Hadoop infrastructure.

C - Hbase is a "database" like interface to Hadoop cluster data.

D - HBase is a part of the Apache Hadoop project that provides a SQL like interface for data processing.

Q 10 -What is a Sequence File?

A - A Sequence File contains a binary encoding of an arbitrary number of homogeneous writable objects.

B - A Sequence File contains a binary encoding of an arbitrary number of heterogeneous writable objects.

C - A Sequence File contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.

D - A Sequence File contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be same type.