[jira] Commented: (SOLR-920) Cache and reuse IndexSchema

["Noble Paul (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710625#action_12710625 ] 

Noble Paul commented on SOLR-920:
---------------------------------

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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