[jira] [Created] (FLINK-12884) Implement HighAvailabilityService based on native k8s APIs

[Shang Yuanchun (Jira)]

MalcolmSanders created FLINK-12884:
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             Summary: Implement HighAvailabilityService based on native k8s APIs
                 Key: FLINK-12884
                 URL: https://issues.apache.org/jira/browse/FLINK-12884
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
            Reporter: MalcolmSanders
            Assignee: MalcolmSanders


Currently flink only supports HighAvailabilityService using zookeeper. As a result, it requires a zookeeper cluster to be deployed on k8s cluster if our customers needs high availability for flink. If we support HighAvailabilityService based on native k8s APIs, it will save the efforts of zookeeper deployment as well as the resources used by zookeeper cluster. It might be especially helpful for customers who run small-scale k8s clusters so that flink HighAvailabilityService may not cause too much overhead on k8s clusters.

Previously [FLINK-11105|https://issues.apache.org/jira/browse/FLINK-11105] has proposed a HighAvailabilityService using etcd. As [~NathanHowell] suggested in FLINK-11105, since k8s doesn't expose its own etcd cluster by design (see [Securing etcd clusters|https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/#securing-etcd-clusters]), it also requires the deployment of etcd cluster if flink uses etcd to achieve HA.



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