Our blog post about Apache Solr interview questions will give you a complete picture of what to expect when applying for jobs that use Apache Solr.

From learning basic ideas to exploring more advanced features, this blog can assist newcomers to Apache Solr and experienced users alike.

With an understanding of its fundamental concepts, you should be prepared for any question during an interview! Ready to dive deeper into the Apache Solr world? Get ready for an exciting session ahead!

Have fun!

1. What is Apache?

Apache is an open-source web application built on Lucene API libraries, offering features similar to Lucene but with additional tools and extensions.

2. What is Solr?

Solr is a web application built on Lucene that provides interoperability with frameworks and platforms through RESTful APIs, such as XML, JSON, CSV, binary format, or HTTP.

3. What is the difference between Solr and Lucene?

Solr is a web application built on Lucene that provides additional tools and extensions. At the same time, Lucene is a set of API libraries that can create and search indexes for read and write documents.

4. What is Solr Cloud?

Solr Cloud is a cloud-based version offering enhanced performance, scalability, and reliability.

5. What are request handlers in Solr?

Request handlers in Solr intercept incoming requests over HTTP or RESTful services, handling administrative tasks, spell-checking, and other search components.

6. What is the admin UI in Solr?

The admin UI in Solr manages your Solr server, allowing you to configure configuration files and admin courses and indexes.

7. What is a Solr server?

A Solr server is a server that runs Solr, a web application built on top of Lucene, allowing users to interact with the index without writing code.

8. What is the Solr Cell Framework?

The Solr Cell Framework is a set of libraries Solr uses to handle all rich document types.

9. What is the difference between Solr and other search engines?

Solr is a web application built on Lucene, providing additional tools and extensions, while other search engines are standalone applications that search and index documents.

10. What are the types of data that Solr can support?

Solr can support various data types, including CSV files, Microsoft Word PDFs, plain text, XML, and JSON.

11. What is the Solr search process?

The Solr search process involves sending a request to a request handler, which sends it to the query parser. Solr analyses syntax and fetches the document from the index.

12. What is the Solr Cloud architecture?

Solr Cloud is a distributed architecture that provides a robust, fault-tolerant platform for high availability. It does not have a dedicated or blocked master but selects leaders dynamically based on requests.

13. What are the essential integrity constraints when using nested documents in Solr?

There are essential integrity constraints when using nested documents in Solr, such as not adding a root document with the same ID as a child document. To retrieve the parent-child relationship, the results appear in the order of first child, second child, and parent.

14. What are the types of commits in Solr?

Solr has two types of commits: self-commit and regular or challenging. Self-commit is used for near real-time searching and is less expensive, making new index documents searchable within seconds.

15. What is the role of request handlers in the Solr search process?

Request handlers in Solr intercept incoming requests over HTTP or RESTful services, handling administrative tasks, spell-checking, and other search components.

16. What are the indexing and search components in Solr?

Solr has numerous indexing and search components, including node dot XML, core properties, and schema. Solr config will be discussed, covering indexing and search components at the core level.

17. What is the first step to installing and running Solr on a local machine?

The first step to installing and running Solr on a local machine is to download the binary distribution, zip it, and extract it.

18. What should you have installed on your local device before installing Solr?

You should install Java, or more significantly, on your local device before installing Solr.

19.Which language can you use to interact with Solr?

You can use any language that provides an HTTP client library for Solr, and open-source client libraries are available for popular languages like dotnet, Python, Ruby, PHP, and Java.

20.How can you download Solr?

You can download the binary distribution of Solr 8.5 from the Apache website and extract the downloaded archive.

21.What should you do after extracting the Solr archive?

After extracting the Solr archive, you should create an environment variable called Solr home and store it in the path where Solr is installed. Changing your working directory to the folder where Solr is installed using the variable would be best.

22. How can you launch Solr?

You can launch Solr by moving to the directory where you extracted it and starting Solr on port or running the command “Solr” in the command prompt. During initialisation, log messages will be printed to the console.

23.What is a Solr core?

A Solr core is a single physical index, typically a collection, distributed across multiple servers in a Solr cluster.

24. What is a Solr home directory?

Each Solr home directory can host various services with a separate guide.

25. What should be included in a Solr configuration set?

A Solr configuration set should include two configuration files: the schema file and the Solr configuration XML file.

26. What features does the Administration Console in Solr provide?

The Administration Console in Solr provides various features, including dashboards, logging, core-specific pages for each core, plugin stats, and schema tabs.

27. How can users use the dashboard in Solr?

The dashboard in Solr allows users to view the configuration of their Solr instance, manage multiple centres, view active schema and Solr config, and access statistics about the Solr core.

28. What is the catch-all field in Solr?

The catch-all field in Solr is a multi-valued field that can copy data from source fields without storing them. It is not stored and must be defined as multivalued—the catch-all field can be used for content and link areas.

29. How can users execute an in-place update in Solr?

To execute an in-place update in Solr, add a modifier to the field that needs to be updated, and the content can be updated or incrementally increased using set or Inc modifiers.

30. What does Solr support the three update methods?

Solr supports three update methods: atomic, in-place, and atomic updates.

Our Apache Solr interview questions blog contains the top frequently asked questions, giving you all the knowledge to answer each question with confidence and expertise.

Not only can this blog teach you more about Apache Solr itself, but its ability can also equip you to answer technology-related interview queries more confidently!