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About the test:

The Apache Spark Online Test evaluates the candidate's ability to transform structured data with RDD API and SparkSQL (Datasets and DataFrames), convert big-data challenges into iterative/ multi-stage Spark scripts, optimize existing Spark jobs using partitioning/ caching and analyze graph structures using GraphX.

Covered skills:

  • Fundamentals of Spark Core
  • Spark Resilient Distributed Datasets (RDD)
  • Developing and running Spark jobs (Java; Scala; Python)
  • Data processing with Spark SQL
See all covered skills

9 reasons why
9 reasons why

Adaface Spark Online Test is the most accurate way to shortlist Spark Developers

Reason #1

Tests for on-the-job skills

Spark online test screens candidates for the following common skills hiring managers look for:

  • Fundamentals of Spark Core and Spark architecture
  • Developing Spark scripts/ jobs using Python API, Java API or Scala API
  • Working with RDDs in Spark, different types of actions and transformations to process and analyze large datasets
  • Working with data sources, sinks and aggregating data with Pair RDDs
  • Creating and Working with Spark Context, DataFrames, and DataSets
  • Working with structured data using Spark SQL (Spark SQL Clauses: Distribute by, order by, clustered by, sort by; Window functions: rank, row_number, dense_rank)
  • Processing continuous streams of data in real-time using Spark Streaming
  • Loading data from HDFS for use in Spark applications & writing the results back into HDFS using Spark
  • Performing standard extract, transform, load (ETL) processes on data using the Spark API
  • Reading and writing files in a variety of file formats
  • Analyzing networks and graphs with GraphX

Along with these the test also has code-tracing MCQ questions and coding questions to evaluate hands-on Scala/ Java/ Python programming skills.

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.

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 ->
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.

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

🧐 Question


Character count
Penny created a jar file for her character count example written in Java. The jar name is attempt.jar and the main class is, which requires an input file name and output directory as input parameters. Which of the following is the correct command to submit a job in Spark with the given constraints?


File system director
Spark Scala API
Spark Streaming
Review the following Spark job description:

1. Monitor file system director for new files. 
2. For new files created in the “/rambo” dictionary, perform word count.

Which of the following snippets would achieve this?


Spark Scala API
Consider the following Spark DataFrame:
Which of the given code fragments produce the following result:
🧐 Question🔧 Skill


Character count
2 mins


File system director
Spark Scala API
Spark Streaming
3 mins


Spark Scala API
4 mins
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Character count
Easy2 mins
File system director
Spark Scala API
Spark Streaming
Medium3 mins
Spark Scala API
Medium4 mins
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

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Spark 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.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Spark 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

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

How is the test customized for Senior Apache Spark Developers?

The questions for Senior Spark Developers will be of a higher difficulty level and are based on advanced topics like:

  • Deploying Spark in a cluster and sharing information between nodes using broadcast variables and accumulators
  • Deep understanding of Spark internal architecture - batch and streaming data, DAG scheduler, query optimizer, and execution engine
  • Improving Spark's performance with persistence and partitioning
  • Using Spark's MLlib to create Machine Learning Models
  • Simulating fault tolerance situations and recovery
  • Using Spark with Random Forests for Classification
  • Using Spark's Gradient Boosted Trees
  • Implementing iterative algorithms such as breadth-first-search
  • Integration of Spark with Hive Warehouse (Hive Optimization Concepts like Partition, Bucketing, Joins)
  • Limitations of MapReduce and the role of Spark in overcoming these limitations
  • Deploying Spark on Hadoop, Apache Mesos, Kubernetes, standalone

Additionally, the MCQs and coding questions to evaluate Scala/ Java/ Python skills will be of higher difficulty levels.

What roles can I use the Spark Test for?

  • Spark Developer
  • Software Developer - Spark
  • Big Data Engineer
  • Senior Spark Developer
  • Scala Big Data Developer
  • Senior Big Data Engineer
  • Spark Engineer

What topics are covered in the Spark Online Test?

Spark Core
Spark SQL
Spark Streaming
Spark MLlib
Resilient Distributed Datasets (RDD)
Hadoop clusters
Lazy evaluation
Structured streaming
Spark Scala API
Spark Java API
Spark Python API
Job Scheduling
Configuration and monitoring
Broadcast variables and accumulators
Data sources and sinks
Integrating with Hive and Hadoop
Data persistence and cache
Singapore government logo

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


How is the test customized based on programming languages?

Spark supports different programming languages like Java, Scala, Python and R. We customize Spark tests according to programming language in the following ways:

  • The code snippets in scenario-based Spark MCQ questions will be of the programming language you pick
  • MCQ questions designed to evaluate the particular programming language will be added to the assessment
  • Coding questions to be programmed in the chosen programming language will be added to the assessment

You can check our standard Java, Scala, and Python tests to get a sense of question quality.

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.

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
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser

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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