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About the test:

The Hadoop Online Test uses scenario-based MCQ questions to evaluate candidates' ability to install Hadoop clusters on the cloud, run optimized MapReduce jobs on Hadoop clusters and write efficient Pig instructions and Hive queries to perform data analysis on complex datasets. The test screens for core Hadoop framework knowledge that hiring managers look for in Hadoop developers and administrators.

Covered skills:

  • Installing and configuring Hadoop clusters
  • Writing efficient Hive and Pig queries
  • Handling streaming data
  • Troubleshooting and monitoring
  • Core Hadoop architecture (HDFS; YARN; MapReduce)
  • Publishing data to clusters
  • Working with different file formats

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9 reasons why
9 reasons why

Adaface Hadoop Test is the most accurate way to shortlist Hadoop Admins

Reason #1

Tests for on-the-job skills

The Hadoop Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Ability to install and configure Hadoop clusters
  • Understanding of core Hadoop architecture (HDFS, YARN, MapReduce)
  • Proficiency in writing efficient Hive and Pig queries
  • Capability to publish data to clusters
  • Able to handle streaming data
  • Knowledge of working with different file formats
  • Skill in troubleshooting and monitoring
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
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Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this Hadoop Online Test will be non-googleable.

🧐 Question


Count number of occurrences
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Chusk works as Hadoop developer at Pesla Inc. Chusk is tasked with processing input data to count number of occurrences of each unique word. Chusk did the following to achieve this:

1. Tokenize each word and emit lateral value 1 with Mapper
2. Reducer increments counter for each literal 1 it receives
Chusk is now tasked with optimizing this by using a combiner. Will Chusk be able to reuse existing reducers as combiners?
A: Yes
B: No
C: Because the sum operation is both associative and commutative and the input and output types to the reduce method match
D: Because the sum operation in the Reducer is incompatible with the operation of a combiner
E: Because the combiner is incompatible with a Mapper, which doesn't use the same data type for both the key and value
F: Insufficient information


Hive ngrams
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Assuming the following Hive statements execute successfully, choose the correct statements that describe the result:

from fooddata select context_ngrams(sentences(lines),
array("twiggy", "romato", null), 68);

A. A bigram of the top 68 sentences that contain the substring "twiggy romato" in the lines column of the input data A1 table.
B. An 68-value ngram of sentences that contain the words "twiggy" or "romato" in the lines column of the fooddata table.
C. A trigram of the top 68 sentences that contain "twiggy romato" followed by a null space in the lines column of the fooddata table.
D. A frequency distribution of the top 68 words that follow the subsequence "twiggy romato" in the lines column of the fooddata table.


P Q relations
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Consider the following two relations, P and Q:
What is the output of the following Pig command?

Q = GROUP P BY p2;
🧐 Question🔧 Skill


Count number of occurrences

3 mins

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Hive ngrams

2 mins

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P Q relations

2 mins

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🧐 Question🔧 Skill💪 Difficulty⌛ Time
Count number of occurrences
Easy3 mins
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Hive ngrams
Medium2 mins
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P Q relations
Easy2 mins
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Reason #4

1200+ customers in 75 countries

customers in 75 countries

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

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Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Hadoop Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Hadoop Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
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Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring

Learn more

About the Hadoop Assessment Test

Why you should use Pre-employment Hadoop Online Test?

The Hadoop Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Installing and configuring Hadoop clusters
  • Core Hadoop architecture including HDFS, YARN, and MapReduce
  • Writing efficient Hive and Pig queries
  • Publishing data to clusters
  • Handling streaming data
  • Working with different file formats
  • Troubleshooting and monitoring
  • Optimizing Hadoop cluster performance
  • Implementing data security in Hadoop
  • Designing and implementing Hadoop data models

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Hadoop Online Test?

  • Installing and configuring Hadoop clusters

    This skill involves setting up and configuring multiple machines to work together as a distributed cluster, with Hadoop software installed on each node. It requires knowledge of system administration, networking, and understanding the Hadoop ecosystem.

  • Core Hadoop architecture (HDFS; YARN; MapReduce)

    This skill covers the fundamental components of Hadoop, including the Hadoop Distributed File System (HDFS) which provides reliable storage, YARN for resource management and job scheduling, and MapReduce for processing large datasets in parallel. Understanding this architecture is crucial for designing and optimizing Hadoop applications.

  • Writing efficient Hive and Pig queries

    This skill involves writing queries in Hive and Pig, which are high-level languages used for processing and analyzing data in Hadoop. Writing efficient queries is important for achieving optimal performance and extracting valuable insights from large datasets.

  • Publishing data to clusters

    This skill requires the ability to import data from external sources into Hadoop clusters, ensuring data is properly formatted and optimized for storage. It also involves managing data replication, compression, and security to ensure data integrity and availability within the cluster.

  • Handling streaming data

    This skill involves processing and analyzing real-time streaming data in Hadoop. It requires knowledge of technologies like Apache Kafka or Apache Storm to ingest and process data as it is generated, enabling real-time analytics and decision-making.

  • Working with different file formats

    This skill involves working with various file formats, such as CSV, JSON, Avro, or Parquet, in Hadoop. It requires understanding file formats and their specific advantages and trade-offs for different use cases, as well as knowledge of tools to process and transform data in different formats.

  • Troubleshooting and monitoring

    This skill is about identifying and resolving issues in Hadoop clusters, such as performance bottlenecks, data inconsistencies, or configuration problems. It involves using various monitoring tools and diagnostic techniques to ensure the smooth operation of the Hadoop environment.

  • Full list of covered topics

    The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Hadoop Online Test to be based on.

    Installing Hadoop
    Configuring Hadoop clusters
    Hadoop distributed file system (HDFS)
    YARN resource management
    MapReduce programming model
    Hive query language
    Pig scripting
    Publishing data to Hadoop clusters
    Processing streaming data in Hadoop
    Working with Avro file format
    Working with Parquet file format
    Working with ORC file format
    Handling JSON data in Hadoop
    How to troubleshoot Hadoop performance issues
    Monitoring Hadoop clusters
    Securing Hadoop clusters
    Data ingestion techniques in Hadoop
    Data processing workflows in Hadoop
    Optimizing Hadoop jobs
    Understanding Hadoop ecosystem components
    Working with Hadoop command line tools
    Analyzing Hadoop logs
    Managing Hadoop clusters
    Backup and recovery strategies for Hadoop
    Working with Apache Spark
    Hadoop cluster tuning
    Handling data skew in Hadoop
    Using Hadoop connectors
    Hadoop data compression techniques
    Data serialization in Hadoop
    Hadoop cluster deployment models
    Design patterns for Hadoop
    Data repartitioning in Hadoop
    Hadoop high availability
    Job scheduling in Hadoop
    Data partitioning in Hadoop
    Understanding Hadoop distributed cache
    Hadoop data locality
    Using Hadoop streaming
    File input/output in Hadoop
    Understanding Hadoop configuration files
    YARN application lifecycle
    Hadoop input/output formats
    Speculative execution in Hadoop
    Understanding Hadoop resource management
    Hadoop security mechanisms
    Managing Hadoop users and groups
    Hadoop cluster sizing and capacity planning
    Hadoop data encryption
    HDFS data replication
    Working with Hadoop libraries
    Working with Hadoop ecosystem tools
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What roles can I use the Hadoop Online Test for?

  • Hadoop Admin
  • Hadoop Engineer
  • Hadoop Tester
  • Hadoop Application Developer
  • Big Data Developer - Hadoop
  • Senior Big Data Engineer - Hadoop
  • Senior Hadoop Administrator

How is the Hadoop Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Experience with Hadoop ecosystem tools like Spark, HBase, and Impala
  • Managing and tuning Hadoop clusters
  • Fine-tuning and optimizing MapReduce jobs
  • Experience with Hadoop data ingestion and processing tools
  • Implementing high availability and disaster recovery for Hadoop clusters
  • Writing and optimizing Apache Hive queries for large datasets
  • Experience with data warehousing concepts and technologies
  • Designing and implementing data pipelines in Hadoop
  • Working with distributed computing frameworks in Hadoop
  • Experience with real-time data processing in Hadoop
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The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

reduction in screening time

Hadoop Hiring Test FAQs

Can I evaluate Hadoop and Spark in the same test?

Yes. You can evaluate multiple skills in the same test. If your Hadoop job description requires candidates to have experience with Hadoop and Apache Spark, we include questions on both the skills. You can check our standard Spark Online Test to understand what kind of questions will be used to evaluate Spark knowledge.

Can I evaluate other Big Data technologies like Hive, Pig, SQL in the same test?

Yes. Big Data roles at different companies require candidates to have experience in different technologies. We support customizing the assessments to work for your job description. This includes including questions to evaluate multiple skills in the same test. Popular Hadoop roles require candidates to have experience with related technologies like Hive, Pig, SQL, Spark. If you require, we include questions on these topics in the same test so that you can identify the right candidates for your company. You can check our standard SQL Online Test and Spark Online Test to see how those skills are evaluated.

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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40 min tests.
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Accurate shortlisting.
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