Hadoop Online Quiz

Q 1 - HDFS files are designed for

A - Multiple writers and modifications at arbitrary offsets.

B - Only append at the end of file

C - Writing into a file only once.

D - Low latency data access.

Q 2 - The main role of the secondary namenode is to

A - Copy the filesystem metadata from primary namenode.

B - Copy the filesystem metadata from NFS stored by primary namenode

C - Monitor if the primary namenode is up and running.

D - Periodically merge the namespace image with the edit log.

Q 3 - Which of the following is not a fencing mechanism for a previously active namenode?

A - Disabling its network port via a remote management command.

B - Revoking its access to shared storage directory.

C - Formatting its disk drive.

D - STONITH

Q 4 - Underreplication in HDFS means-

A - No replication is happening in the data nodes.

B - Replication process is very slow in the data nodes.

C - The frequency of replication in data nodes is very low.

D - The number of replicated copies is less than as specified by the replication factor.

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 - Running Start-dfs.sh results in

A - Starting namenode and datanode

B - Starting namenode only

C - Starting datanode only

D - Starting namenode and resource manager

Q 7 - To unarchive an already archived file in haddop use the command

A - unrar

B - unhar

C - cp

D - cphar

Q 8 - A running job in hadoop can

A - Be killed with a command

B - Can never be killed with a command

C - Can be killed only by shutting down the name node

D - Be paused and run again

Q 9 - How does Hadoop process large volumes of data?

A - Hadoop uses a lot of machines in parallel. This optimizes data processing.

B - Hadoop was specifically designed to process large amount of data by taking advantage of MPP hardware.

C - Hadoop ships the code to the data instead of sending the data to the code.

D - Hadoop uses sophisticated caching techniques on name node to speed processing of data.

Q 10 - Which of the following components retrieves the input splits directly from HDFS to determine the number of map tasks?

A - The NameNode.

B - The TaskTrackers.

C - The JobClient.

D - The JobTracker.

E - None of the options is correct.