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Apache Cassandra Online Test

The Apache Cassandra Online Test uses scenario-based multiple-choice questions to evaluate candidates on their knowledge and understanding of the distributed NoSQL database management system, Apache Cassandra. The test aims to assess candidates' proficiency in areas such as data modeling, query language (CQL), cluster architecture, replication, data consistency, and performance optimization. It measures their ability to design, deploy, and manage Cassandra clusters in various use cases and their understanding of Cassandra's security and scalability features.

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Screen candidates with a 35 mins test

Test duration:  ~ 35 mins
Difficulty level:  Moderate
Availability:  Available as custom test
  • 15 Cassandra MCQs
Covered skills:
Data Model and DML Operations
Cassandra Query Language (CQL)
Data Modeling Best Practices
Partitioning and Distribution
Data Replication and Consistency
Cassandra Architecture and Internals
Performance Tuning and Optimization
Backup and Recovery
Security and Authentication
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Use the Apache Cassandra Test to shortlist qualified candidates

The Apache Cassandra 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 design efficient data models in Apache Cassandra
  • Proficiency in Cassandra Query Language (CQL) for performing data manipulation
  • Understanding of Cassandra's architecture and internals
  • Knowledge of data partitioning and distribution strategies in Cassandra
  • Familiarity with data replication and consistency in Cassandra
  • Experience in performance tuning and optimization techniques in Cassandra
  • Ability to design and implement a backup and recovery strategy in Cassandra
  • Understanding of security and authentication mechanisms in Cassandra
  • Knowledge of data modeling best practices in Cassandra
  • Proficiency in handling exceptions and errors in Cassandra
  • Understanding the basics of Apache Cassandra and its use cases
  • Awareness of data modeling techniques for efficient storage and retrieval
  • Familiarity with the various CQL data types and their usage
  • Ability to tune Cassandra configurations for optimal performance
  • Knowledge of data distribution strategies for high availability and fault tolerance
  • Understanding of consistency levels and their impact on data integrity
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Screen candidates with the highest quality 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 15,000+ questions. The actual questions on this Apache Cassandra Online Test will be non-googleable.

🧐 Question


Load/migrate data
Rinsha works at a private equity fund, where they have subscribed to feeds from several companies that track startups. The feeds are delivered in multiple formats such as CSV files,  access to their RDBMS or NOSQL (Cassandra) database or daily incremental data. What should Rinsha use in Cassandra to load/ migrate data from one Cassandra cluster to another?


Read Repair and Data Retrieval Mechanics
Consistency Level
Data Retrieval
You're a system architect troubleshooting read inconsistencies on a globally distributed Cassandra cluster. A developer informs you that sometimes when reading data, outdated information is retrieved. You decide to dive deeper into the read path.

The application reads data using the following CQL:
Given the known facts:

1. The cluster spans three data centers.
2. The replication factor is set as 3 for each data center.
3. The read must return only after fetching data from 2 nodes in each data center.
4. You want to utilize the read repair mechanism to address the inconsistencies.

Which consistency level should replace the '?' in the `SELECT` statement to ensure the above requirements?


Replication on nodes
The startup Ro is working at has a Cassandra cluster (Ring) with 7 nodes, and the admin set up a new KeySpace named CoralKeySpace. Ro wants to insert configuration data for their mobile application named CoralApp. The admin has told Ro that the default Replication Factor is 3 on this cluster for CoralKeySpace. Ro inserted 40 records in a table of CoralKeySpace. Which of the following apply?
A: Before the insert query, Ro needs to execute a replicate-all command using cqlsh for the session, so that the data can be replicated on 3 nodes. 
B: After the insert query, Ro needs to execute a replicate-all command using cqlsh, so that the data can be replicated on 3 nodes. 
C: Ro does not need to do anything, replication is taken care of by Cassandra.
🧐 Question🔧 Skill


Load/migrate data

2 mins



Read Repair and Data Retrieval Mechanics
Consistency Level
Data Retrieval

2 mins



Replication on nodes

2 mins

🧐 Question🔧 Skill💪 Difficulty⌛ Time
Load/migrate data
Easy2 mins
Read Repair and Data Retrieval Mechanics
Consistency Level
Data Retrieval
Medium2 mins
Replication on nodes
Medium2 mins

Test candidates on core Apache Cassandra Hiring Test topics

Data Model and DML Operations: Data Model and DML Operations encompass the concepts and skills required to design and manipulate data in Cassandra. This skill is crucial to assess as it determines how well candidates can work with the database at a fundamental level.

Cassandra Query Language (CQL): Cassandra Query Language (CQL) is a SQL-like language used to interact with Cassandra. Measuring this skill in the test helps recruiters evaluate candidates' ability to write efficient queries, which is essential for Cassandra database management.

Data Modeling Best Practices: Data Modeling Best Practices involve following industry-recommended guidelines for designing data models in Cassandra. This skill is necessary to evaluate as it assesses candidates' knowledge of optimization techniques and strategies to ensure high performance and scalability.

Partitioning and Distribution: Partitioning and Distribution refer to the process of dividing data across multiple nodes in a Cassandra cluster. Including this skill in the test allows recruiters to assess candidates' understanding of how data is distributed and stored, which directly impacts the performance and fault tolerance of a Cassandra database.

Data Replication and Consistency: Data Replication and Consistency pertain to the mechanisms used in Cassandra to replicate data across nodes and maintain data consistency. Evaluating this skill in the test helps recruiters gauge candidates' knowledge of replication strategies and their understanding of how consistency is achieved in a distributed database.

Cassandra Architecture and Internals: Cassandra Architecture and Internals cover the underlying architecture and inner workings of the Cassandra database. This skill is important to measure as it demonstrates candidates' familiarity with the various components and mechanisms that enable Cassandra's scalability and fault tolerance.

Performance Tuning and Optimization: Performance Tuning and Optimization involve identifying and implementing measures to improve the performance and efficiency of a Cassandra database. This skill should be measured in the test to evaluate candidates' ability to optimize queries, handle large data sets, and fine-tune Cassandra configurations for optimal performance.

Backup and Recovery: Backup and Recovery encompass the techniques and practices used to back up and restore data in Cassandra. Measuring this skill in the test allows recruiters to determine candidates' proficiency in data backup strategies and their ability to recover data in case of failures or disasters.

Security and Authentication: Security and Authentication refer to the mechanisms and procedures employed to secure a Cassandra database from unauthorized access. Including this skill in the test helps recruiters assess candidates' knowledge of authentication methods, encryption techniques, and best practices for safeguarding data in a distributed environment.

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Have questions about the Apache Cassandra Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours 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. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

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.

What roles can I use the Apache Cassandra Test for?

Here are few roles for which we recommend this test:

  • Cassandra Developer
  • Cassandra Solutions Architect
  • Cassandra DBA
  • Cassandra Architect
  • Cassandra Analyst
Can I see a sample test, or do you have a free trial?


The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

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.

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.

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