Apache Solr works
Indexing
- Apache Solr is capable to get quick search responses because, as a replacement for searching the text directly, it searches an index instead.
- It stores index in a directory called index in the data directory.
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Working:
- The Apache Solr creates inverted index of the documents that are posted in to its collection or core.
- Core or collection is just part entity which can be used to post documents and running queries on that set of documents.
- Inverted index is a main term in the domain of Information Retrieval and Natural Language Processing.
- Now take a document, note down all the unique words appearing in that document as well as note the frequency of the words. Hence the inverted index is ready.
- Solr creates similar inverted index of the documents posted to its core using a defined schema.
- Schema is a blue print which helps Solr in creating inverted index of the documents by giving a set of predefined fields in the
schema.xmlfile. - Once Solr completes indexing the documents posted to its core or collection it can be used to run queries.
- Now a user can query Solr for related documents using its query parser or admin panel.
- When a query is given to Solr, it breaks the query into different chunks or entities and matches it with the inverted index of the documents created previous.
- The documents obtained accordingly of a Solr search is based on the same class and other constraints defined in its
schema.xmlandsolr.configfile.