Till Rohrmann created FLINK-21382:
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Summary: Standalone K8s documentation does not explain usage of
standby JobManagers
Key: FLINK-21382
URL: https://issues.apache.org/jira/browse/FLINK-21382
Project: Flink
Issue Type: Improvement
Components: Deployment / Kubernetes, Documentation
Affects Versions: 1.12.1, 1.13.0
Reporter: Till Rohrmann
Our [standalone K8s
documentation|https://ci.apache.org/projects/flink/flink-docs-release-1.12/deployment/resource-providers/standalone/kubernetes.html#high-availability-with-standalone-kubernetes]
mentions how to configure K8s HA services. It does not mention that this only
works with a single JobManager. When using standby JobManagers, then the given
deployment yamls won't work because the {{jobmanager.rpc.address}} is
configured to be the {{jobmanager}} service.
Changing the configuration to work is surprisingly difficult because of a lack
of documentation. Moreover, it is quite difficult to pass in custom
configuration values when using a ConfigMap for sharing Flink's
{{flink-conf.yaml}}. The problem is that mounted ConfigMaps are not writable
from a pod perspective. See [this
answer|https://stackoverflow.com/a/66228073/4815083] for how one could achieve
it.
I think we could improve our documentation to explain our users how to
configure a standalone HA cluster with standby JobManagers.
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