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https://issues.apache.org/jira/browse/SOLR-6533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14173922#comment-14173922
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Tomás Fernández Löbbe commented on SOLR-6533:
---------------------------------------------

Can this handler be enabled/disabled? What about extended? For example, if I 
have a custom component that has init params, could I make it so that I can 
modify those too?
In the code, I see some exceptions that don't log or re-throw, we may be losing 
some information there. 
And a question, what's "SET_USER_PROPERTY"


> Support editing common solrconfig.xml values
> --------------------------------------------
>
>                 Key: SOLR-6533
>                 URL: https://issues.apache.org/jira/browse/SOLR-6533
>             Project: Solr
>          Issue Type: Sub-task
>            Reporter: Noble Paul
>         Attachments: SOLR-6533.patch, SOLR-6533.patch, SOLR-6533.patch
>
>
> There are a bunch of properties in solrconfig.xml which users want to edit. 
> We will attack them first
> These properties will be persisted to a separate file called config.json (or 
> whatever file). Instead of saving in the same format we will have well known 
> properties which users can directly edit
> {code}
> cores.transientCacheSize
> indexConfig.mergeFactor
> {code}   
> The api will be modeled around the bulk schema API
> {code:javascript}
> curl http://localhost:8983/solr/collection1/config -H 
> 'Content-type:application/json'  -d '{
> "set-property" : {"index.mergeFactor:5},
> "unset-property":{"cores.transientCacheSize"}
> }'
> {code}
> {code:javascript}
> //or use this to set ${mypropname} values
> curl http://localhost:8983/solr/collection1/config -H 
> 'Content-type:application/json'  -d '{
> "set-user-property" : {"mypropname":"my_prop_val"},
> "unset-user-property":{"mypropname"}
> }'
> {code}
> The values stored in the config.json will always take precedence and will be 
> applied after loading solrconfig.xml. 
> An http GET on /config path will give the real config that is applied . 



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