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https://issues.apache.org/jira/browse/SOLR-14040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17050531#comment-17050531
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Noble Paul commented on SOLR-14040:
-----------------------------------
There are a few of fundamental problems with the way this is implemented
# The first time the {{IndexSchema}} is created, it uses the
{{SolrResourceLoader}} of the first core lets's call it {{SRL1}}. When another
core comes up, it gets another {{SolrResourceLoader}} {{SRL2}} . The components
loaded for core2 uses {{SRL2}} and the {{IndexSchema}} it's gonna use uses
{{SRL1}} (because it is shared). This can cause {{ClassCastException}} if the
per core component is sharing an object with schema
# As the core2 is still holding on to the shared schema, it is in turn holding
a reference to SRL1 . So, even if core1 is unloaded , it is not fully garbage
collected & the classes & objects can linger on
What can we do?
# Revert this and have a proper design & implement everything correctly in the
next release
# Mark this as experimental & give a warning to users that this is faulty
> solr.xml shareSchema does not work in SolrCloud
> -----------------------------------------------
>
> Key: SOLR-14040
> URL: https://issues.apache.org/jira/browse/SOLR-14040
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Fix For: 8.5
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> solr.xml has a shareSchema boolean option that can be toggled from the
> default of false to true in order to share IndexSchema objects within the
> Solr node. This is silently ignored in SolrCloud mode. The pertinent code
> is {{org.apache.solr.core.ConfigSetService#createConfigSetService}} which
> creates a CloudConfigSetService that is not related to the SchemaCaching
> class. This may not be a big deal in SolrCloud which tends not to deal well
> with many cores per node but I'm working on changing that.
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