Hadoop Online Quiz

Q 1 - What is the main problem faced while reading and writing data in parallel from multiple disks?

A - Processing high volume of data faster.

B - Combining data from multiple disks.

C - The software required to do this task is extremely costly.

D - The hardware required to do this task is extremely costly.

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 property used to set the default filesystem for Hadoop in core-site.xml is-

A - filesystem.default

B - fs.default

C - fs.defaultFS

D - hdfs.default

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 - When a client contacts the namenode for accessing a file, the namenode responds with

A - Size of the file requested.

B - Block ID of the file requested.

C - Block ID and hostname of any one of the data nodes containing that block.

D - Block ID and hostname of all the data nodes containing that block.

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 replication factor of a file in HDFS can be changed using

A - changerep

B - rerep

C - setrep

D - xrep

Q 8 - Job tracker runs on

A - Namenode

B - Datanode

C - Secondary namenode

D - Secondary datanode

Q 9 - Can you run Map - Reduce jobs directly on Avro data?

A - Yes, Avro was specifically designed for data processing via Map-Reduce.

B - Yes, but additional extensive coding is required.

C - No, Avro was specifically designed for data storage only.

D - Avro specifies metadata that allows easier data access. This data cannot be used as part of map-reduce execution, rather input specification only.

Q 10 - You have loads of data that can be processed by you MRjobs. However you need the data to be available to Analysts and Scients in you organisation. What is the best format to represent the input?

A - Sequence File.

B - Avro.

C - XML.

D - HTML.