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From "Noble Paul (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-13553) Node level custom RequestHandlers
Date Tue, 02 Jul 2019 19:30:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-13553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877263#comment-16877263
] 

Noble Paul commented on SOLR-13553:
-----------------------------------

bq.Agree that clusterprops was not intended as a place to dump any and config on the cluster
level, even if it has a REST API.

Ideally, we should have a single file for storing every cluster-wide config. The reason why
{{clusterprops.json}} was added was only because {{solr.xml}} was a read-only config. The
ideal name was {{cluster-config.json}} which should have had all the cluster-wide configuration.
Now that the genie is out of the bottle , I would just live with it instead of adding another
file that we need to manage.

bq. Can you mention a few examples of new handlers that will use this mechanism?

here are a few examples 
* A handler to collect and get custom metrics
* A handler that can compute custom suggestions for autoscaling


> Node level custom RequestHandlers
> ---------------------------------
>
>                 Key: SOLR-13553
>                 URL: https://issues.apache.org/jira/browse/SOLR-13553
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>            Priority: Major
>
> These components
>  * Available on every node
>  * deployed at the {{CoreContainer}} level
>  * Available at {{/solr/admin/<plugin-name> or {{/api/node/<plugin-name>}}
(v2 style)
>  * Should implement the {{SolrRequestHandler}} interface
> The configuration is persisted in {{clusterprops.json}}
> {code}
> curl -X POST -H 'Content-type:application/json' --data-binary '{
>   "add-requesthandler": {
>       "name": "/foo", 
>       "class" : "fully.qualified.ClassName"
>     
>   }
> }' http://localhost:8983/api/cluster
> {code}
> delete it using
> {code}
> curl -X POST -H 'Content-type:application/json' --data-binary '{
>   "delete-requesthandler": "/foo"
> }' http://localhost:8983/api/cluster
> {code}



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