[GitHub] [solr] epugh commented on a change in pull request #531: Developer docs for modules and packages

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epugh commented on a change in pull request #531:
URL: https://github.com/apache/solr/pull/531#discussion_r786811078



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File path: dev-docs/plugins-modules-packages.adoc
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@@ -0,0 +1,137 @@
+= Plugins, Modules and Packages
+:toc: left
+
+This document discusses how developers can group features into Plugins, Modules and Packages.
+
+== Definitions
+
+=== Plugin
+
+A plugin is a low level class that implements a certain Lucene or Solr interface, such as
+`QParserPlugin`, `AuthPlugin`, `UpdateRequestProcessor`, `QueryResponseWriter` etc.
+See ref guide page https://solr.apache.org/guide/solr-plugins.html[Solr Plugins] for details.
+
+=== Module
+
+Solr modules are addon Solr plugins that are not part of solr-core, but officially maintained
+by the Solr project. They provide well-defined features such as the "extracting" module which lets
+users index rich text documents with Apache Tika. Modules were earlier known as "contribs".
+
+Each module produces a separate `.jar` file in the build, and thus help keep the solr-core small and lean,
+and also reduces risk by including only needed java classes on the class-path.
+
+A single module can contain multiple Plugins.
+
+=== Package
+
+A Package is a module or a 3rd party plugin for Solr provisioned with a `manifest.json`
+to enable discovering and loading through https://solr.apache.org/guide/package-manager.html[Solr's package manager]. Packages are loaded from a "package repository" which is
+simply a json file on a HTTP server.
+
+Packages can be maintained by 3rd party devs and hosted on
+GitHub, like https://github.com/yasa-org/yasa[YASA],
+https://github.com/rohitbemax/dataimporthandler[DataImportHandler],
+https://github.com/erikhatcher/solr-velocity[Velocity],
+https://github.com/cominvent/request-sanitizer-component[RequestSanitizerComponent]
+and https://solr.cool/[several others]. Such packages are not endorsed by the Solr project and must be used at own risk.

Review comment:
       "at your own risk"




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