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https://issues.apache.org/jira/browse/SOLR-7073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul updated SOLR-7073:
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Attachment: SOLR-7073.patch
first cut
> Add an API to add a jar to a collection's classpath
> ---------------------------------------------------
>
> Key: SOLR-7073
> URL: https://issues.apache.org/jira/browse/SOLR-7073
> Project: Solr
> Issue Type: Sub-task
> Reporter: Noble Paul
> Assignee: Noble Paul
> Attachments: SOLR-7073.patch
>
>
> The idea of having separate classloaders for each component may be counter
> productive. This aims to add a jar dependency to the collection itself and
> each core belonging to that collection will have the jar in the classpath
> As we load everything from the .system collection , we cannot make the core
> loading delayed till .system is fully loaded and is available .
> There is a new set of config commands to manage the dependencies on a
> collection level. It is possible to have more than one jar as a dependency.
> The "lib" attribute is same as the blob name that we use in the blob store API
> example:
> {code}
> curl http://localhost:8983/solr/collection1/config -H
> 'Content-type:application/json' -d '{
> "add-runtimelib" : {"name": "jarname" , "version":2 },
> "update-runtimelib" :{"name": "jarname" ,"version":3},
> "delete-runtimelib" :"jarname"
> }'
> {code}
> The same is added to the overlay.json .
> The default SolrResourceLoader does not have visibility to these jars .
> There is a classloader that can access these jars which is made available
> only to those components which are specially annotated
> Every pluggable component can have an optional extra attribute called
> {{runtimeLib=true}}, which means, these components are not be loaded at core
> load time. They are tried to be loaded on demand and if all the dependency
> jars are not available at the component load time an error is thrown .
> example of registering a valueSourceParser which depends on the runtime
> classloader
> {code}
> curl http://localhost:8983/solr/collection1/config -H
> 'Content-type:application/json' -d '{
> "create-valuesourceparser" : {"name": "nvl" ,
> "runtimeLib": true,
> "class":"solr.org.apache.solr.search.function.NvlValueSourceParser ,
> "nvlFloatValue":0.0 }
> }'
> {code}
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