Biao Geng created FLINK-27329:
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Summary: Add default value of replica of JM pod and remove
declaring it in example yamls
Key: FLINK-27329
URL: https://issues.apache.org/jira/browse/FLINK-27329
Project: Flink
Issue Type: Improvement
Components: Kubernetes Operator
Reporter: Biao Geng
Currently, we do not explicitly set the default value of `replica` in
`JobManagerSpec`. As a result, Java sets the default value to be zero.
Besides, in our examples, we explicitly declare `replica` in `JobManagerSpec`
to be 1.
After a deeper look when debugging the exception thrown in FLINK-27310, we find
it would be better to set the default value to 1 for `replica` fields and
remove the declaration in examples due to following reasons:
1. A normal Session or Application cluster should have at least one JM. The
current default value, zero, does not follow the common case.
2. One JM can work for k8s HA mode as well and if users really want to launch a
standby JM for faster recorvery, they can declare the `replica` field in the
yaml file. In examples, we just use the new default valu(i.e. 1) should be fine.
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