3/28/2023 0 Comments Apache lucene project![]() ![]() Lucene and hence Lucene.NET stores data in immutable "segments." Segments are made of multiple files. We are just going to hit the highlights here because it's a deep topic. Lucene's LSM Inspired ArchitectureĪt this early stage of your journey it's probably good to cover a few things about how Lucene stores data. And because it's licensed under the permissive Apache 2.0 license it's typically considered suitable for both commercial and non-commercial use. And as a library it can be used to power search in desktop applications, websites, mobile apps (iOS or Android) or even on IoT devices like the Raspberry Pi. If you'd like to dive deeper into this topic, Lucene.NET 4.8 vs Java Lucene 9.x is an community written article that covers it in more detail. So the reality is that Lucene.NET 4.8 contains the vast majority of features found in Java Lucene 9.x and in fact Lucene 4.x is more similar to Lucene 9.x than to Lucene 3.x. The step up in features between 3.x and 4.x was the biggest in Lucene's history and after that it was followed my many smaller releases. You might be aware that Java Lucene is at version 9.x. Version 4.8 is now in late Beta and, as I already mentioned, is used in production by many developers. The prior Lucene.NET release was version 3.0.3 and the current release (which receives all the focus) is Lucene.NET 4.8. This is why only a few specific versions have been ported. There are over 644K lines of code not counting outside dependencies. Porting Lucene from java to C# is a huge undertaking. This test coverage is what makes Lucene.NET so stable. Lucene.NET has more than 7800+ passing unit tests. It has far more features then Lucene.NET 3.03 and has much better unit test coverage then the older version. And makes it easy for them to contribute to the project or customize it since it's pure C#.Ĭurrently Lucene.NET 4.8 is in Beta but it is extremely stable and many developers already use it in production. This port makes the power of Lucene available to all. You can scroll through the years and see the major Apache Lucene milestones.Īpache Lucene.NET 4.8 is an open source project who's aim is to be a line by line c# port of java based Apache Lucene 4.8. In March 2020, the open source project celebrated it's 20th birthday. The codebase for Apache Lucene is very mature. ![]() And unlike traditional sql databases, it's data engine is optimized for full text search. And it can perform full text search on that data in sub-second time. The reason Apache Lucene is so widely used is because it's extremely powerful and can index large amounts of data quickly - think 100s of GB/Hours. Apache Lucene has a huge following and is used directly or indirectly to power search by many companies you probably know including Amazon, Twitter, LinkedIn, Netflix, Salesforce, SAS, and Microsoft Power BI.Īpache Lucene is the core search library used by popular open source search servers like Apache Solr, ElasticSearch and OpenSearch. Apache Lucene.NET is a C# port of Java based Apache Lucene. ![]()
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