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https://issues.apache.org/jira/browse/SOLR-17096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17807929#comment-17807929
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ASF subversion and git services commented on SOLR-17096:
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Commit 1de6d081009d835116df89df3cc2c8d66c1efff4 in solr's branch
refs/heads/main from pjmcarthur
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=1de6d081009 ]
SOLR-17096: Cluster Singleton plugin support in solr.xml (#2126)
* Generalize to all "cluster plugins", albeit only supporting
<clusterSingleton> and <replicaPlacementFactory> at this time.
* Introduced new `solr.cluster.plugin.edit.enabled` boolean setting to disable
/cluster/plugin mutability, required for solr.xml's use of those plugins.
Co-authored-by: Paul McArthur <[email protected]>
> Support for Cluster Singleton plugins in solr.xml
> -------------------------------------------------
>
> 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
> Time Spent: 6h 10m
> Remaining Estimate: 0h
>
> 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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