[FLINK-17231] Deprecate possible implicit fallback from LB to NodePort When retrieving Endpoint of LB Service

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.10.0, 1.10.1
• Component/s: Deployment / Kubernetes
• Labels: auto-unassigned pull-request-available stale-assigned
• Assignee: liuzhuo
• Reporter: Canbin Zheng
• Created: 18/Apr/20 11:33
• Updated: 07/Jul/22 22:37

Description

Currently, if people use the LB Service, when it comes to retrieving the Endpoint for the external Service, we make an implicit fallback immediately to return the NodePort address and port if we fail to get the LB address in a single try. This kind of toleration can confuse the users since the NodePort address/port may be unaccessible due to some reasons like network security policy, and the users may not know what really happen behind.

This ticket proposes to always return the LB address/port otherwise throw an Exception indicating that the LB is unready or abnormal.

Issue Links

• fixes: FLINK-15795 KubernetesClusterDescriptor seems to report unreachable JobManager interface URL
• is duplicated by: FLINK-15795 KubernetesClusterDescriptor seems to report unreachable JobManager interface URL
• links to: GitHub Pull Request #19301