[jira] [Created] (SOLR-18317) standalone solr 10 logging UI tries to access zookeeper: NullPointerException

["Chris M. Hostetter (Jira)" <ji...@apache.org>]

Chris M. Hostetter created SOLR-18317:
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             Summary: standalone solr 10 logging UI tries to access zookeeper: NullPointerException
                 Key: SOLR-18317
                 URL: https://issues.apache.org/jira/browse/SOLR-18317
             Project: Solr
          Issue Type: Test
    Affects Versions: 10.0
            Reporter: Chris M. Hostetter


The following problem affects solr-10 and the current 10x branch (but with slightly different stack traces)

When using solr in "user managed" (aka: standalone) mode, attempts to use the admin UI logging screen to change the log level succeed in changing the log level on the node, but also cause a NullPointerException as the underlying java code tries to use zookeeper to lookup a list of nodes to proxy the request to.

Making an explicit request to {{/admin/info/logging?set=...}} does not cause a NullPointerException.

The underlying problem seems to be a disconnect in the assumptions/preconditions in various pieces of code:
 * the UI assumes it can _*always*_ include the {{nodes=all}} param when sending {{set=...}} to {{/admin/info/logging}}
 * {{AdminHandlersProxy.resolveNodes()}} and/or {{RemoteRequestProxy.validateNodeNames()}} seem to assume they will only be invoked in a "cloud" deployment
 * callers to {{AdminHandlersProxy.resolveNodes()}} and/or {{RemoteRequestProxy.validateNodeNames()}} seem to assume requests should be proxied anytime a {{node(s)}} param is specified.


{panel}I believe this bug affects any Solr APIs that may delegate to 
{{AdminHandlersProxy}} and/or {{RemoteRequestProxy}} -- so at a minimum that would be {{LoggingHandler}}, {{MetricsHandler}}, and {{SystemInfoHandler}}
{panel}

 



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