Apache Cassandra Online Test

About the 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.

Covered skills:

Tombstone expiration
Starved stables
Replication
Commitlog sync
Selection clause

Bloom filter
Data caches
the Consistency level
Snitch
Nodetool

See all covered skills

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9 reasons why

Adaface Apache Cassandra Online Test is the most accurate way to shortlist Java Developers

Reason #1

Tests for on-the-job skills

The Apache Cassandra 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.

The Adaface Apache Cassandra Online Test screens candidates for the typical skills recruiters look for Cassandra Developer roles:

Experience with Cassandra
Familiarity with Linux Shell Scripting
Experience with Java or Python
Experience managing production infrastructure, tuning and automation
Knowledge of with DevOps tools

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for Cassandra Developer roles. Anti-cheating features enable you to be comfortable with conducting assessments online. The Apache Cassandra Online Test is ideal for helping recruiters identify which candidates have the skills to do well on the job.

Reason #2

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 Apache Cassandra Online Test will be non-googleable.

🧐 Question
Easy Load/migrate data	Solve
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?
Medium Read Repair and Data Retrieval Mechanics Consistency Level Data Retrieval	Solve
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?
Medium Replication on nodes	Solve
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
	Easy Load/migrate data	2 mins Cassandra	Solve
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?
	Medium Read Repair and Data Retrieval Mechanics Consistency Level Data Retrieval	2 mins Cassandra	Solve
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?
	Medium Replication on nodes	2 mins Cassandra	Solve
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	💪 Difficulty	⌛ Time
	Load/migrate data	Cassandra	Easy	2 mins	Solve
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	Cassandra	Medium	2 mins	Solve
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	Cassandra	Medium	2 mins	Solve
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.

Reason #4

1200+ 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 Apache Cassandra 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.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Apache Cassandra 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.

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.

Reason #9

Advanced Proctoring

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About Apache Cassandra Developer Roles

Apache Cassandra is an open-source NoSQL DBMS designed specifically for handling a high volume of data with the help of its distributed architecture. First developed at Facebook for its internal organization usage, Cassandra DBMS is faster than the traditional RDBMS.

A Cassandra developer is in charge of duties related to the Apache Cassandra NoSQL database management system. A excellent Cassandra developer is well-versed in database management systems and has an analytical, problem-solving approach.

Typical Cassandra Developer responsibilities include:

Managing and supporting Production DataStax cluster and related processes
Building Code as Infrastructure Pipelines using AWS cloud services
Participating in standard SDLC process using agile methodology and test-driven approach

What roles can I use the Apache Cassandra Online Test for?

Java Developer
Data Science Developer

What topics are covered in the Apache Cassandra Online Test?

NoSQL Database

Key Value Store

Document Store

Column Store

Graph Databases

Key-Value Store DB

Document Store DB

Column Store DB

Graph DB

Conceptual Data Model

Logical Data Model

Physical Data Model

Database Elements

CQLSH

Main configuration file for Cassandra

YAML File

Clusters

Keyspace

Durable Writes

Replication Factor

Replication Strategy

Simple Strategy

Network Topology Strategy

Column Family

Primary Key

Compound Primary Key

Single Primary Key

Composite Partitioning Key

Static CQL Table

Dynamic CQL Table

Drop

Truncate

Gossip Protocol

Tokens

Partitions

Snitch

In-memory data structure that corresponds to a CQL table

Memtable

Contents of the memtable are flushed to disk in a file called an SSTable

SSTable

crash-recovery mechanism that supports Cassandra’s durability goals

Commit Log

Coordinator Node

Read Operation

Compaction

Anti-Entropy

Merkel Tree

Repairs

Logging Levels

JMX

JConsole

Nodetool Utility

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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.

85%

reduction in screening time

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FAQs

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.