[jira] [Created] (FLINK-27329) Add default value of replica of JM pod and remove declaring it in example yamls

["Biao Geng (Jira)" <ji...@apache.org>]

Biao Geng created FLINK-27329:
---------------------------------

             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.



--
This message was sent by Atlassian Jira
(v8.20.7#820007)