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https://issues.apache.org/jira/browse/SOLR-17096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17793360#comment-17793360
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Paul McArthur commented on SOLR-17096:
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I had considered making the plugin source pluggable, but not the
ContainerPluginsRegistry. I will take a closer look at doing that, thanks for
suggesting it.
> Support for Cluster Singleton plugins with immutable deployments
> ----------------------------------------------------------------
>
> Key: SOLR-17096
> URL: https://issues.apache.org/jira/browse/SOLR-17096
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Plugin system
> Reporter: Paul McArthur
> Priority: Major
>
> This issue is related to, and follows on from SOLR-15782.
> It should be possible to install and manage the configuration of a cluster
> singleton plugin in an immutable deployment of SolrCloud. SOLR-15782
> discusses the merits of declaring such plugin configurations in solr.xml, and
> it's implementation provides scope to declare the Replica Placement plugin
> there.
>
> While this approach could work generally for plugins with associated
> factories that are used to create instances of the plugin when required at
> runtime (like the Replica Placement Plugin), it does not provide a solution
> for cluster singleton plugins which are only instantiated by having a
> configuration declared in the ZooKeeper cluster properties, which are managed
> solely by invocation of the /cluster/plugin edit APIs.
> It is undesirable to invoke the /cluster/plugin edit APIs with an immutable
> deployment, and instead any modification to the cluster singleton
> configurations should occur via a new deployment with the changes declared in
> solr.xml
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