Inverted index and forward index in Solr shrading

[Rajdeep Sahoo <ra...@gmail.com>]

Can any explain me what is inverted index and forward index used in solr
shrading . Is there any resource from where I can find some knowledge about
this.

Re: Inverted index and forward index in Solr shrading

[Shawn Heisey <ap...@elyograg.org>]

On 1/8/2019 10:34 AM, Rajdeep Sahoo wrote:
> Can any explain me what is inverted index and forward index used in solr
> shrading . Is there any resource from where I can find some knowledge about
> this.

Most of Solr's functionality is provided by Lucene, which is a 
Java-based programming API that provides full-text search.

https://lucene.apache.org/core/
https://lucene.apache.org/core/7_6_0/index.html

The inverted index is the central feature of Lucene, where most of its 
capability starts.

I've never heard of a forward index.  The closest things I can think of 
that might satisfy that terminology are either stored fields or DocValues.

If you want in-depth information about Lucene, you may find better 
answers on the mailing list for that product than this mailing list.

https://lucene.apache.org/core/discussion.html

To answer a later message where you asked about the source code:

https://wiki.apache.org/solr/HowToContribute

Note that when you get the source code for Solr, you are also getting 
all the source code for Lucene.  Both projects share the same codebase.

Thanks,
Shawn