wangyang0918 opened a new pull request #14837:
URL: https://github.com/apache/flink/pull/14837
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## What is the purpose of the change
Currently, when the watcher(pods watcher, ConfigMap watcher) is closed with
exception, we will call `WatchCallbackHandler#handleFatalError`. And this could
cause JobManager/TaskManager terminating and then failover.
For most cases, this is correct. But not for "too old resource version"
exception. See more information
[here](https://stackoverflow.com/questions/61409596/kubernetes-too-old-resource-version).
Usually this exception could happen when the APIServer is restarted or the
network connection between JobManager/TaskManager pods and APIServer is not
very stable. In such situation, we just need to create a new watch and continue
to do the pods/ConfigMap watching. This could help the Flink cluster reducing
the impact of K8s cluster restarting.
## Brief change log
* Create a new watcher when the old one is closed with `HTTP_GONE`
## Verifying this change
* Add a new UT
`KubernetesPodsWatcherTest#testClosingWithTooOldResourceVersion`
* Manually test on Mac with minikube
* Start a minikube
* Use `minikube ssh` to tunnel into the virtual machine
* Use `docker ps | grep apiserver` to find the APIServer docker container
and then `docker kill {containerId}`
* Verify the JobManager logs containing "Creating a new watch ..."
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (**yes** / no /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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