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 - For the frequently accessed HDFS files the blocks are cached in

A - the memory of the datanode

B - in the memory of the namenode

C - Both A&B

D - In the memory of the client application which requested the access to these files.

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 - The hadoop frame work is written in

A - C++

B - Python

C - Java

D - GO

Q 5 - The namenode knows that the datanode is active using a mechanism known as

A - heartbeats

B - datapulse

C - h-signal

D - Active-pulse

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 - 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 - In a HDFS system with block size 64MB we store a file which is less than 64MB. Which of the following is true?

A - The file will consume 64MB

B - The file will consume more than 64MB

C - The file will consume less than 64MB.

D - Can not be predicted.

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

A - HBase

B - Avro

C - Sqoop

D - Zookeeper

Q 10 - Which one of the following statements is true regarding <key,value> pairs of a MapReduce job?

A - A key class must implement Writable.

B - A key class must implement WritableComparable.

C - A value class must implement WritableComparable.

D - A value class must extend WritableComparable.