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 the local disk of the namenode the files which are stored persistently are −

A - namespace image and edit log

B - block locations and namespace image

C - edit log and block locations

D - Namespace image, edit log and block locations.

Q 3 - The following is not permitted on HDFS files

A - Deleting

B - Renaming

C - Moving

D - Executing.

Q 4 - Which of the below property gets configured on core-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 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 command hadoop fs -test -z URI gives the result 0 if

A - if the path is a directory

B - if the path is a file

C - if the path is not empty

D - if the file is zero length

Q 7 - The decommission feature in hadoop is used for

A - Decommissioning the namenode

B - Decommissioning the data nodes

C - Decommissioning the secondary namenode.

D - Decommissioning the entire Hadoop cluster.

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 distributed cache?

A - The distributed cache is special component on name node that will cache frequently used data for faster client response. It is used during reduce step.

B - The distributed cache is special component on data node that will cache frequently used data for faster client response. It is used during map step.

C - The distributed cache is a component that caches java objects.

D - The distributed cache is a component that allows developers to deploy jars for Map-Reduce processing.

Q 10 - The org.apache.hadoop.io.Writable interface declares which two methods? (Choose 2 answers.)

1. public void readFields(DataInput).

2. public void read(DataInput).

3. public void writeFields(DataOutput).

4. public void write(DataOutput).

A - 1 & 4

B - 2 & 3

C - 3 & 4

D - 2 & 4