quiz on bigdata and haddop

Hadoop works in

• Centralized processing fashion

• master – slave fashion

• worker/slave fashion

• All of the mentioned

Which of the following is the daemon of Hadoop?

• NameNode

• Node manager

• DataNode

• All of the above

Apache Hadoop achieves reliability by replicating the data across multiple hosts, and hence does not require ________ storage on hosts.

• Filesystem

• RAID

• Local FS

• Operating system

Answer explanation

‘Redundant Arrays of Independent Disks’ or ‘Redundant Arrays of Inexpensive Disks’.

Data protection and Data Consistency  is achieved using this Technology. RAID is an acronym for Redundant Arrays of Independent/ Inexpensive Disks. This technology combines multiple, small, inexpensive disk drives into an Array of disk drives which is treated as a single storage unit (drive) by the computer.

Which type of data Hadoop can deal with is

• Structured

• Semi – structured

• Unstructured

• All of the above

Hadoop Framework is written in

• Python

• Java

• C++

• Scala

Which of the following is true about Hadoop?

• Hadoop MapReduce processes the data at very low latency

• Hadoop can't handle structured data

• Hadoop is schema-less – we don't need to define a schema before writing the data

• None of the above

As compared to RDBMS, Apache Hadoop

• Has higher data Integrity

• Does ACID transactions

• Is suitable for read and write many times

• Works better on unstructured and semi-structured data

Hadoop command to list all the blocks corresponding to each file in the hdfs?

• hadoop fsck / -files -blocks

• hadoop fsck / -blocks -files

• hadoop ls / -blocks -files

• hadoop fchk / -files -blocks

In which all languages you can code in Hadoop?

• Java

• Python

• C++

• All of the above

Hadoop can be deployed on commodity servers, which provides low-cost processing as well as storage of unstructured, huge volume of data.

• TRUE

• FALSE