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What is the internal architecture of Apache solr ?

Editor — Mon, 12 Jul 2021 09:24:15 +0000

Solr Architecture ─ Building Blocks

Following are the major building blocks of Apache Solr:

Solr Architecture ─ Building Blocks Request Handler:

The requests that send to Solr are processed by the request handlers.
The requests may be a query requests otherwise index update requests.
It is based on our requirement; we need to choose the request handler.
To pass a request to Solr, we generally map the handler to a certain URI end-point and the particular request will be served by it.

Search Component:

The search component is a type of search provided in Apache Solr.
It might be spell checking, faceting, query, and hit highlighting and so on.
These search components are registered as search handlers. Multiple components can be registered to a search handler.

Query Parser:

The Apache Solr query parser parses the queries that we pass to Solr and verifies the queries for syntactical errors.
After parsing the queries, it translates them to a format which Lucene understands.

Response Writer:

A response writer is the component which generates the formatted outcome for the user queries.
Apache Solr supports response formats some are XML, JSON, CSV, etc.
We have different response writers for each type of response.

Analyser/tokenizer:

Lucene recognizes data in the form of tokens.
Apache Solr analyses the content, divides it into tokens, and passes these tokens to Lucene.
An analyser examines the text of fields and generates a token stream.
A tokenizer breaks the token stream prepared by the analyser into tokens.

Update Request Processor:

Whenever we send an update request to Apache Solr, the request is run through a set of plugins (signature, logging, indexing), collectively known as update request processor.
This processor is responsible for modifications that are adding a field, dropping a field, etc.