mmoscher commented on issue #653:
URL: https://github.com/apache/solr-operator/issues/653#issuecomment-1867307643

   Not sure, but could be a similar/related issue.
   After upgrade from v0.7.0 to v0.8.0 for our SolrCloud cluster (9.0), we're 
getting a 404 from Solr API
   
   `Error returned from Solr API: 404. no core retrieved for core name:  null. 
Path : /cluster/replicas/balance`
   
   ```
   2023-12-22T06:37:54Z    INFO    Warning: Reconciler returned both a non-zero 
result and a non-nil error. The result will always be ignored if the error is 
non-nil and the non-nil error causes reqeueuing with exponential backoff. For 
more details, see: 
https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/reconcile#Reconciler  
{"controller": "solrcloud", "controllerGroup": "solr.apache.org", 
"controllerKind": "SolrCloud", "SolrCloud": {"name":"solr","namespace":"solr"}, 
"namespace": "solr", "name": "solr", "reconcileID": 
"01215b5c-6555-404c-85f5-2a5246ef41cb"}
   2023-12-22T06:37:54Z    ERROR   Reconciler error        {"controller": 
"solrcloud", "controllerGroup": "solr.apache.org", "controllerKind": 
"SolrCloud", "SolrCloud": {"name":"solr","namespace":"solr"}, "namespace": 
"solr", "name": "solr", "reconcileID": "01215b5c-6555-404c-85f5-2a5246ef41cb", 
"error": "Error returned from Solr API: 404. no core retrieved for core name:  
null. Path : /cluster/replicas/balance"}
   
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
           
/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:329
   
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
           
/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:266
   
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
           
/go/pkg/mod/sigs.k8s.io/[email protected]/pkg/internal/controller/controller.go:227
   ``` 
   
   Same error on Solr side:
   
   `2023-12-22 06:40:54.937 ERROR (qtp1942828992-2283) [] o.a.s.a.V2HttpCall >> 
path: '/cluster/replicas/balance'
   2023-12-22 06:40:54.937 ERROR (qtp1942828992-2283) [] o.a.s.a.V2HttpCall 
Error in init() => org.apache.solr.common.SolrException: no core retrieved for 
core name:  null. Path : /cluster/replicas/balance
           at org.apache.solr.api.V2HttpCall.init(V2HttpCall.java:155)
   org.apache.solr.common.SolrException: no core retrieved for core name:  
null. Path : /cluster/replicas/balance`
   
   why is the operator hitting this path?
   
   Thanks for any help.


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