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https://issues.apache.org/jira/browse/SOLR-15782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17784355#comment-17784355
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Vincent Primault commented on SOLR-15782:
-----------------------------------------
Here is an example of what it would look like to configure a
PlacementPluginFactory in solr.xml: https://github.com/apache/solr/pull/2071
It's not fully tested yet, it's to discuss the approach.
It allows to configure the plugin in the following manner:
{code:xml}
<replicaPlacementFactory
class="org.apache.solr.cluster.placement.plugins.AffinityPlacementFactory">
<int name="minimalFreeDiskGB">10</int>
</replicaPlacementFactory>
{code}
I realised that my previous approach had one major drawback: it was configuring
the initial plugins to be used, but then if a cluster plugin was installed and
uninstalled, we would lose the plugin configured in solr.xml. I'm afraid that,
unless we attempt a major refactoring, we have to go with ad-hoc code for every
type of plugin, since they are instantiated in slightly different ways every
time.
> Configure custom node/container handlers in solr.xml
> ----------------------------------------------------
>
> Key: SOLR-15782
> URL: https://issues.apache.org/jira/browse/SOLR-15782
> Project: Solr
> Issue Type: Improvement
> Reporter: David Smiley
> Priority: Major
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> Since Solr 8.6 via SOLR-14404, it's been possible to define custom
> node/CoreContainer request handlers. However, the current mechanism requires
> the use of cluster properties (in ZooKeeper). That allows for dynamic
> registration (cool) but it's awkward to pre-define them – it doesn't comply
> with an [immutable
> infrastructure|https://www.bmc.com/blogs/immutable-infrastructure/] philosphy
> where node handlers can be defined by configuration local to the Solr node.
> That's solr.xml. So here, I propose that node handlers be defined there,
> perhaps the same as is done in solrconfig.xml.
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