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 - In Hadoop 2.x release HDFS federation means

A - Allowing namenodes to communicate with each other.

B - Allow a cluster to scale by adding more datanodes under one namenode.

C - Allow a cluster to scale by adding more namenodes.

D - Adding more physical memory to both namenode and datanode.

Q 3 - The current block location of HDFS where data is being written to,

A - is visible to the client requesting for it.

B - Block locations are never visible to client requests.

C - May or may not be visible to the reader.

D - becomes visible only after the buffered data is committed.

Q 4 - Which of the below property gets configured on hdfs-site.xml ?

A - Replication factor

B - Directory names to store hdfs files.

C - Host and port where MapReduce task runs.

D - Java Environment variables.

Q 5 - The Zookeeper

A - Detects the failure of the namenode and elects a new namenode.

B - Detects the failure of datanodes and elects a new datanode.

C - Prevents the hardware from overheating by shutting them down.

D - Maintains a list of all the components IP address of the Hadoop cluster.

Q 6 - When a backup node is used in a cluster there is no need of

A - Check point node

B - Secondary name node

C - Secondary data node

D - Rack awareness

Q 7 - If we increase the size of files stored in HDFS without increasing the number of files, then the memory required by namenode

A - Decreases

B - Increases

C - Remains unchanged

D - May or may not increase

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 - When archiving Hadoop files, which of the following statements are true? (Choose two answers)

1. Archived files will display with the extension .arc.

2. Many small files will become fewer large files.

3. MapReduce processes the original files names even after files are archived.

4. Archived files must be UN archived for HDFS and MapReduce to access the original, small files.

5. Archive is intended for files that need to be saved but no longer accessed by HDFS.

A - 1 & 3

B - 2 & 3

C - 2 & 4

D - 3 & 4

Q 10 - Keys from the output of shuffle and sort implement which of the following interface?

A - Writable.

B - WritableComparable.

C - Configurable.

D - ComparableWritable.

E - Comparable.