Clustering error when deploy EAP 7/ RHDG 7 / RHSSO 7 via template on OpenShift 4

Environment

• Red Hat Data Grid (RHDG)
  • 7.x
• Red Hat Single Sing-On (RHSSO)
  • 7.x
• Red Hat OpenShift Container Platform (OCP)
  • 4.8 uppper

Issue

When deploying RHDG 7.3 via template and trying to scale up or down the cluster's pods get MERGED cluster view ERRORs:

20:44:05,825 INFO  [org.infinispan.CLUSTER] (thread-5,null,sso-1-b92n6) ISPN000093: Received new, MERGED cluster view for channel ejb: MergeView::[sso-1-bgbgb|1] (2) [sso-1-bgbgb, sso-1-b92n6], 2 subgroups: [sso-1-bgbgb|0] (1) [sso-1-bgbgb], [sso-1-b92n6|0] (1) [sso-1-b92n6]

Resolution

Edit the template in the PING service definition, removing the annotation tolerate-unready-endpoints and adding service.spec.publishNotReadyAddresses as below:

Remove:

kind: Service
apiVersion: v1
metadata:
  name: ${APPLICATION_NAME}-ping
...
  annotations:
    service.alpha.kubernetes.io/tolerate-unready-endpoints: 'true'

Using:

oc annotate svc  ${APPLICATION_NAME}-ping service.alpha.kubernetes.io/tolerate-unready-endpoints-

Add:

kind: Service
apiVersion: v1
metadata:
  name: ${APPLICATION_NAME}-ping
...
spec:
  clusterIP: None
  clusterIPs:
  - None
...
  publishNotReadyAddresses: true
...

Using:

oc patch svc ${APPLICATION_NAME}-ping -p '{"spec":{"publishNotReadyAddresses":true}}'

Root Cause

The tolerate-unready-endpoints was an annotation that was replaced by service.spec.publishNotReadyAddresses - a spec.field - that's a core difference.
Therefore, tolerate-unready-endpoints Content from github.com is not included.is no longer valid on OpenShift 4.8 and above. Instead, service.spec.publishNotReadyAddresses must be used.

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