Online Hadoop Assessments to Help You Hire the Most Competent Hadoop Professionals

Hadoop is an open-source, scalable framework written in Java that enables apportioned processing of enormous datasets across various computers through basic programming models. It is used to store massive amounts of data and provide extensive processing power and manage virtually several tasks or jobs at once.

The Hadoop Apache framework application operates in an environment that offers distributed data storage and computation across multiple computers. Hadoop easily scales up from a single server to several thousand machines, each providing the benefit of local computation and storage. 

Listed below are the key features of Hadoop:

Speed - Hadoop can store and process enormous amounts of data instantaneously. 

Computing power - Hadoop's distributed computing environment enables fast processing of big data. The more computing nodes you implement, the better processing power you experience.

Fault tolerance - Fault tolerance is the property that protects data and application processing against hardware failure. When one node is down, jobs get automatically redirected to other nodes, ensuring the distributed computing process goes without fail. Also, multiple data copies are stored automatically.

Ease - You don’t have to preprocess data before its storage in Hadoop. In traditional relational databases, the experience is just the contrary. There is no storage limitation regarding how much data you would like to use later, including unstructured data such as images, texts and videos.

Economical - Despite being free, Hadoop offers exceptional value to the users. Its open-source framework comes with commodity hardware to handle large volumes of data.

Scalability - The distinguishing feature of Hadoop is its scalability, which means that you can handle more data by including the additional nodes and growing your system. 

About Hadoop Online Test

There's a generally acknowledged talent gap. It seems to be arduous to find entry and mid-level programmers who have sufficient Hadoop skills to be productive with its multifaceted features. That's one reason why employers are striving to get the best talents suited to their requirements. Mercer | Mettl's Hadoop test makes it easier to find professionals with adequate Big Data Frameworks/Hadoop-based skills. 

Hadoop online test enables recruiters and hiring managers to evaluate such skills as Hadoop programming, resource manager, data replication in HDFS, etc. Mercer | Mettl's online Hadoop test is developed and validated by subject matter experts to understand and assess a candidate's expertise in the Hadoop framework. Hadoop pre-employment tests take candidates' convenience up a notch by allowing them to take Hadoop tests from anywhere within their comfort zone.

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The Hadoop online test helps in screening those candidates who possess skills as given below: 

  • A good understanding of Apache Hadoop and associated technologies such as HBase, Avro, Pig
  • Proficiency in Hadoop development and implementation
  • Expertise in Hadoop HDFS, MapReduce, YARN
  • Well-versed in integration techniques, such as ETL
  • Proficiency in using workflow schedulers, such as Oozie,
  • Ability to work with workflow schedulers like Oozie, column-oriented datastore

Mettl's Hadoop online test questions are so well-thought-out and well-made that they accurately gauge the depth and breadth of the candidate's knowledge and expertise in Hadoop. Customization of tests, which includes questions specific to the client's job requirement, is also available. Mettl's powerful test reports help the hiring managers to evaluate the section-wise performance of test-takers to identify their forte and areas that need improvement. 

This online Hadoop test is useful for hiring:

  • Hadoop Developer
  • Hadoop Architect
  • Hadoop Engineer
  • Big Data Developer

Use Big Data Hadoop Online Test for Recruitment and Hiring:

A Big Data Hadoop programmer is the one who performs analysis of vast data stores and uncovers insights. He/She is responsible for designing, building, installing, configuring, and supporting Hadoop. A Hadoop programmer spends a lot of time cleaning data as per business requirements and creates scalable and high-performance web services for data tracking.

Mettl’s Hadoop assessments are based on proven methodologies to help the hiring managers conduct pre-employment testing of applicants for employment screening and assess prospective candidates' competencies and knowledge in the most cost-beneficial and effective way. With a balanced combination of expertise and a performance-based approach, these assessments can help you reduce the time spent on the candidate evaluation process.

Mettl’s online Hadoop tests can be accessed on PCs, networks, or the Internet in a proctored or remote environment. With these tests, employers can gauge the test-takers' skills, aptitude, knowledge, and attitude.

Perfect for pre-employment testing, pre-training testing, and post-training testing or workforce planning, Mettl's online assessment products can be used to find the best of the lot and help make significant and precise people decisions.

Answer to common queries:

How does Hadoop work?

Hadoop is an Apache open-source software framework built on Java that ensures distributed processing of voluminous datasets across computers' clusters using basic programming models. 

Hadoop utilizes the potential of distributed computing and distributed data storage. The Hadoop framework enables you to harness the computing and storage capacity of multiple computers most efficiently. The end-user is inclined to think that he/she interacts with one computer and performs computing/storage solely on a system. The knowledge of distributed storage and distributed computing is crucial to understand the power of Hadoop. 

The Hadoop distributed File system (HDFS) is a virtual, distributed file system deployed on top of filesystems. HDFS is used for accessing any file seamlessly. It performs critical managerial tasks, such as fault tolerance, saving you lots of hassles.

When it comes to computation, the approach stays the same. Being an end-user, you provide inputs to your machine and run your code. The Hadoop framework understands your command and internally allocates your code to hundreds of nodes. It takes each machine's output to optimize it for getting the final output. The entire process happens internally and spontaneously by the Hadoop framework.

When should Hadoop be used?

Hadoop can be used in the following cases:

  • For Processing Voluminous Data
  • For Storing and Processing a Diverse Set of Data
  • For Parallel Data Processing

Is Hadoop a database?

Hadoop is not a database. It is a distributed file system that processes and stores a massive amount of data sets across a computer cluster. The two primary components of Hadoop are HDFS (Hadoop Distributed File System) and MapReduce.

What are some commonly asked Hadoop interview questions?

Hadoop experts are among the most well-paid IT professionals in the world these days. Moreover, the demand for such professionals is increasing on an unprecedented scale with each passing day. Organizations rely on large amounts of data daily. Listed below is a compiled list of the most popular Hadoop interview questions:

  • What differentiates Hadoop from Spark?
  • Can you explain some real-time industry applications of Hadoop?
  • What makes Hadoop different from other parallel computing systems?
  • What are the modes in which Hadoop can run?
  • What is the difference between InputSplit and HDFS block?
  • Explain the benefits of a distributed cache?
  • Can you explain the difference between Checkpoint NameNode, NameNode, and Backup Node?
  • Explain the input formats in Hadoop?
  • What are the different core methods of a Reducer?
  • What is a DataNode? Is NameNode effective in tackling DataNode failures?

Why is Hadoop so popular?

Companies across the globe use Hadoop for its flexibility and scalability.

What is the advantage of Hadoop?

It's undeniable that leading organizations such as Google and Facebook manage and store their massive data sets using Hadoop; however, many other enterprises make the most of Hadoop functionalities for the benefits it offers, as mentioned below:

  • Cost-effective
  • Scalable 
  • Fast
  • Failproof 
  • Flexible

What are the main components of Hadoop?

There are four crucial components of Hadoop:

  • HDFS - the storage unit of Hadoop
  • MapReduce - the processing unit of Hadoop
  • YARN -  the resource handling unit of Hadoop
  • Zookeeper

In what language is Hadoop written?

The Hadoop framework is primarily written in Java, with some command utilities written in the form of shell scripts and some native codes in C.

What are the tools used in Hadoop?

Listed below are the top ten Hadoop tools that one should master

  • HDFS
  • HIVE
  • Mahout
  • NoSQL
  • GIS tools 
  • Avro
  • Flume
  • Clouds
  • Spark
  • Impala
  • MapReduce

Is Hadoop still in demand?

Hadoop is a prevalent big data technology. Organizations are increasingly relying on Hadoop to address their business concerns. The demand for Hadoop professionals has increased over time; still, there are not enough professionals to fill in the request.

Which technology is used to serialize the data in Hadoop?

Writables create serialized data types in Hadoop. 

Which platform does Hadoop run on?

Hadoop is based on a cross-platform operating system.

How to start learning for Hadoop?

These tips will come in handy:

  • Understand the purpose of learning Hadoop
  • Get well-versed in Hadoop concepts and components
  • Know the theory behind its working
  • The practice is of essence
  • Follow essential blogs and websites about Hadoop
  • Join a course
  • Get Hadoop certified

What are Hadoop datasets?

Much like a relational database table, a dataset is a group of records. Records are the same as table rows. The only difference is that columns can include numbers or strings and encapsulate such data structures as maps, lists, and other records. 

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Relevant for Industries

  • IT
  • ITeS

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Big Data