Quiz on Lecture 4

Which one of the following stores data?

• Name node

• Data node

• Master node

• None of these

The client reading the data from HDFS filesystem in Hadoop does which of the following?

• Gets only the block locations form the namenode

• Gets the data from the namenode

• Gets both the data and block location from the namenode

• Gets the block location from the datanode

Which of the following is the true about metadata?

• Metadata shows the structure of HDFS directories/files

• FsImage & EditLogs are metadata files

• Metadata contain information like number of blocks, their location, replicas

• All of the above

Hadoop is open source.

• Always True

• True only for Apache Hadoop

• True only for Apache and Cloudera Hadoop

• Always False

Hadoop differs from volunteer computing in

• Volunteers donating CPU time and not network bandwidth

• Volunteers donating network bandwidth and not CPU time

• Hadoop cannot search for large prime numbers

• Only Hadoop can use mapreduce

For reading/writing data to/from HDFS, clients first connect to

• NameNode

• DataNode

• Secondary NameNode

• None of the above

Hadoop is a framework that allows the distributed processing of:

• Small Data Sets

• Semi-Large Data Sets

• Large Data Sets

• Large and Small Data sets

As compared to RDBMS, Hadoop

• Has higher data Integrity

• Does ACID transactions

• IS suitable for read and write many times

• Works better on unstructured and semi-structured data

What is the default HDFS replication factor?

• 4

• 1

• 3

• 2

In which process duplicate task is created to improve the overall execution time?

• Speculative execution

• Erasure coding

• NameNode High Availability

• HDFS Federation