Noble Paul created SOLR-7073:
--------------------------------
Summary: 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
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 .
So, we have the following set of 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-runtime-lib" : {"lib": "jarname" , "version":2 },
"update-runtime-lib" :{"lib": "jarname" ,"version":3},
"delete-runtime-lib" :"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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