Hadoop Online Quiz

Q 1 - Which of the following is true for disk drives over a period of time?

A - Data Seek time is improving faster than data transfer rate.

B - Data Seek time is improving more slowly than data transfer rate.

C - Data Seek time and data transfer rate are both increasing proportionately.

D - Only the storage capacity is increasing without increase in data transfer rate.

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 - What is are true about HDFS?

A - HDFS filesystem can be mounted on a local clients Filesystem using NFS.

B - HDFS filesystem can never be mounted on a local clients Filesystem.

C - You can edit a existing record in HDFS file which is already mounted using NFS.

D - You cannot append to a HDFS file which is mounted using NFS.

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 - The input split used in MapReduce indicates

A - The average size of the data blocks used as input for the program

B - The location details of where the first whole record in a block begins and the last whole record in the block ends.

C - Splitting the input data to a MapReduce program into a size already configured in the mapred-site.xml

D - None of these

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 archive file created in Hadoop always has the extension of

A - .hrc

B - .har

C - .hrh

D - .hrar

Q 8 - When a jobTracker schedules a task is first looks for

A - A node with empty slot in the same rack as datanode

B - Any node on the same rack as the datanode

C - Any node on the rack adjacent to rack of the datanode

D - Just any node in the cluster

Q 9 - What is writable?

A - Writable is a java interface that needs to be implemented for streaming data to remote servers.

B - Writable is a java interface that needs to be implemented for HDFS writes.

C - Writable is a java interface that needs to be implemented for MapReduce processing.

D - None of these answers are correct.

Q 10 - Which one of the following statements is false regarding the Distributed Cache?

A - The Hadoop framework will ensure that any files in the Distributed Cache are distributed to all map and reduce tasks.

B - The files in the cache can be text files, or they can be archive files like zip and JAR files.

C - Disk I/O is avoided because data in the cache is stored in memory.

D - The Hadoop framework will copy the files in the Distributed Cache on to the slave node before any tasks for the job are executed on that node.