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https://issues.apache.org/jira/browse/FLINK-27329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525020#comment-17525020
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Biao Geng commented on FLINK-27329:
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cc [~wangyang0918]
I can take this ticket~
> 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
> Priority: Major
>
> 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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