OKD - operator cache requires rebuild

After upgrading my OKD cluster to 4.15.0-0.okd-2024-03-10-010116, I noticed that the certified-operators pod in the namespace 'openshift-marketplace' was constantly crashing. Digging a little deeper, I found this to be the root cause:

 [archy@helper01 ~]$ oc -n openshift-marketplace logs pod/certified-operators-ckpbk -c registry-server  
 time="2024-03-22T07:54:45Z" level=info msg="starting pprof endpoint" address="localhost:6060"       
 time="2024-03-22T07:54:45Z" level=fatal msg="cache requires rebuild: cache reports digest as \"e1eec9cd4a58db98\", but computed digest is \"8fcd2934467d9214\""  

I fixed this by disabling and re-enabling the operator source (certified-operators in my case):

 [archy@helper01 ~]$ oc edit operatorhubs.config.openshift.io/cluster  

 ...  
 spec:  
  disableAllDefaultSources: true  
  sources:  
    - disabled: false  
      name: community-operators  
    - disabled: true  
      name: certified-operators  
 ...  

Check the available pods:

 [archy@helper01 ~]$ oc -n openshift-marketplace get pods -o wide  

Re-enable the certified-operators source again:

 [archy@helper01 ~]$ oc edit operatorhubs.config.openshift.io/cluster  

 ...  
 spec:  
  disableAllDefaultSources: true  
  sources:  
    - disabled: false  
      name: community-operators  
    - disabled: false  
      name: certified-operators  
 ...  

The certified-operators pod should now be available again and operators should be able to be installed.

Sources:

RedHat KB Article 7049642

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