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https://issues.apache.org/jira/browse/SOLR-920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710625#action_12710625
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Noble Paul commented on SOLR-920:
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how about an extra attribute in the cores tag to enable sharing as follows.
{code:xml}
<solr>
<cores adminPath="/admin/cores" shareSchema="true">
</cores>
</solr>
{code}
if shareSchema is set to true then for a given path only one instance of
IndexSchema is created and it will be shared . It is the responsibilty of the
user to ensure that he does not use any core specific properties in the
schema.xml when this attribute is set to true
> Cache and reuse IndexSchema
> ---------------------------
>
> Key: SOLR-920
> URL: https://issues.apache.org/jira/browse/SOLR-920
> Project: Solr
> Issue Type: Improvement
> Reporter: Noble Paul
>
> if there are 1000's of cores then the cost of loading unloading schema.xml
> can be prohibitive
> similar to SOLR-919 we can also cache the DOM object of schema.xml if the
> location on disk is same. All the dynamic properties can be replaced lazily
> when they are read.
> We can go one step ahead in this case. Th IndexSchema object is immutable .
> So if there are no core properties then the same IndexSchema object can be
> used across all the cores
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