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https://issues.apache.org/jira/browse/FLINK-28584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17570815#comment-17570815
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Yang Wang commented on FLINK-28584:
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Just like the doc said, immutable ConfigMap could reduce the APIServer load by
closing watches. Since the flink configuration ConfigMap does not have any
watches, I am not pretty sure whether making it immutable is really helpful.
> Add an option to ConfigMap that can be set to immutable
> -------------------------------------------------------
>
> Key: FLINK-28584
> URL: https://issues.apache.org/jira/browse/FLINK-28584
> Project: Flink
> Issue Type: Improvement
> Components: Deployment / Kubernetes
> Reporter: liuzhuo
> Priority: Minor
>
> When a job is started in the kubernetes environment, multiple configmaps are
> usually created to mount data (eg: flink-config, hadoop-config, etc.). If a
> cluster runs too many jobss, the configmap will become a performance
> bottleneck, and occasionally An exception of file mount failure occurs,
> resulting in slower pod startup time
> According to kubernetes' description of configmap, if the immutable parameter
> is enabled, it will greatly reduce the pressure on kube-apiserver and improve
> cluster performance.
> [configmap-immutable|https://kubernetes.io/zh-cn/docs/concepts/configuration/configmap/#configmap-immutable]
> In my understanding, parameter information such as flink-config,
> hadoop-config is loaded at startup, and even if it is subsequently modified,
> it cannot affect the running of the job. Should we provide a control switch
> to choose whether to set the configmap to immutable?
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