Hadoop Online Quiz

Q 1 - HDFS block size is larger as compared to the size of the disk blocks so that

A - Only HDFS files can be stored in the disk used.

B - The seek time is maximum

C - Transfer of a large files made of multiple disk blocks is not possible.

D - A single file larger than the disk size can be stored across many disks in the cluster.

Q 2 - What mechanisms Hadoop uses to make namenode resilient to failure.

A - Take backup of filesystem metadata to a local disk and a remote NFS mount.

B - Store the filesystem metadata in cloud.

C - Use a machine with at least 12 CPUs

D - Using expensive and reliable hardware.

Q 3 - Which of this is not a scheduler options available with YARN?

A - Optimal Scheduler

B - FIFO scheduler

C - Capacity scheduler

D - Fair scheduler

Q 4 - The command to check if Hadoop is up and running is −

A - Jsp

B - Jps

C - Hadoop fs –test

D - None

Q 5 - The Hadoop tool used for uniformly spreading the data across the data nodes is named −

A - Scheduler

B - Balancer

C - Spreader

D - Reporter

Q 6 - When a machine is declared as a datanode, the disk space in it

A - Can be used only for HDFS storage

B - Can be used for both HDFS and non-HDFs storage

C - Cannot be accessed by non-hadoop commands

D - cannot store text files.

Q 7 - The purpose of starting namenode in the recovery mode is to

A - Recover a failed namenode

B - Recover a failed datanode

C - Recover data from one of the metadata storage locations

D - Recover data when there is only one metadata storage location

Q 8 - What is the default input format?

A - The default input format is xml. Developer can specify other input formats as appropriate if xml is not the correct input.

B - There is no default input format. The input format always should be specified.

C - The default input format is a sequence file format. The data needs to be preprocessed before using the default input format.

D - The default input format is TextInputFormat with byte offset as a key and entire line as a value.

Q 9 - Which one of the following is not true regarding to Hadoop?

A - It is a distributed framework.

B - The main algorithm used in it is Map Reduce

C - It runs with commodity hard ware

D - All are true

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