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https://issues.apache.org/jira/browse/FLINK-28171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17570528#comment-17570528
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Martijn Visser commented on FLINK-28171:
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[~elishamoshe] Feel free to open a PR. I understand that this is important for
you, but we do have a number of priorities for the 1.16 release that have been
committed to. This functionality doesn't have such commitment. It could very
well be that this won't be able to make the 1.16 release and might get
postponed to 1.17. There's no such thing as "the Flink team"; Flink is open
source and is operated via the community. All resources are scarce and everyone
is doing the best they can.
> Adjust Job and Task manager port definitions to work with Istio+mTLS
> --------------------------------------------------------------------
>
> Key: FLINK-28171
> URL: https://issues.apache.org/jira/browse/FLINK-28171
> Project: Flink
> Issue Type: Improvement
> Components: Deployment / Kubernetes
> Affects Versions: 1.14.4
> Environment: flink-kubernetes-operator 1.0.0
> Flink 1.14-java11
> Kubernetes v1.19.5
> Istio 1.7.6
> Reporter: Moshe Elisha
> Priority: Major
>
> Hello,
>
> We are launching Flink deployments using the [Flink Kubernetes
> Operator|https://nightlies.apache.org/flink/flink-kubernetes-operator-docs-stable/]
> on a Kubernetes cluster with Istio and mTLS enabled.
>
> We found that the TaskManager is unable to communicate with the JobManager on
> the jobmanager-rpc port:
>
> {{2022-06-15 15:25:40,508 WARN akka.remote.ReliableDeliverySupervisor
> [] - Association with remote system
> [akka.tcp://[[email protected]|mailto:[email protected]]:6123]
> has failed, address is now gated for [50] ms. Reason: [Association failed
> with
> [akka.tcp://[[email protected]|mailto:[email protected]]:6123]]
> Caused by: [The remote system explicitly disassociated (reason unknown).]}}
>
> The reason for the issue is that the JobManager service port definitions are
> not following the Istio guidelines
> [https://istio.io/latest/docs/ops/configuration/traffic-management/protocol-selection/]
> (see example below).
>
> There was also an email discussion around this topic in the users mailing
> group under the subject "Flink Kubernetes Operator with K8S + Istio + mTLS -
> port definitions".
> With the help of the community, we were able to work around the issue but it
> was very hard and forced us to skip Istio proxy which is not ideal.
>
> We would like you to consider changing the default port definitions, either
> # Rename the ports – I understand it is Istio specific guideline but maybe
> it is better to at least be aligned with one (popular) vendor guideline
> instead of none at all.
> # Add the “appProtocol” property[1] that is not specific to any vendor but
> requires Kubernetes >= 1.19 where it was introduced as beta and moved to
> stable in >= 1.20. The option to add appProtocol property was added only in
> [https://github.com/fabric8io/kubernetes-client/releases/tag/v5.10.0] with
> [#3570|https://github.com/fabric8io/kubernetes-client/issues/3570].
> # Or allow a way to override the defaults.
>
> [https://kubernetes.io/docs/concepts/services-networking/_print/#application-protocol]
>
>
> {{# k get service inference-results-to-analytics-engine -o yaml}}
> {{apiVersion: v1}}
> {{kind: Service}}
> {{...}}
> {{spec:}}
> {{ clusterIP: None}}
> {{ ports:}}
> {{ - name: jobmanager-rpc *# should start with “tcp-“ or add "appProtocol"
> property*}}
> {{ port: 6123}}
> {{ protocol: TCP}}
> {{ targetPort: 6123}}
> {{ - name: blobserver *# should start with "tcp-" or add "appProtocol"
> property*}}
> {{ port: 6124}}
> {{ protocol: TCP}}
> {{ targetPort: 6124}}
> {{...}}
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