kl0u opened a new pull request #12317:
URL: https://github.com/apache/flink/pull/12317
## What is the purpose of the change
This PR simply changes the error message presented to the user when he/she
is trying to submit to Yarn but hadoop is not in the classpath. The new message
will be:
```
No Executor found. Please make sure to have hadoop in your classpath. For
more information on how to do so refer to the "Deployment & Operations" section
of the official Apache Flink documentation.
```
## Brief change log
The changes are:
1. a `FallbackYarnSessionCli` that will be loaded by the `CliFrontend` in
case there is a loading error when the frontend tries to load the actual
`FlinkYarnSessionCli`. This cli will simply throw an exception with the above
message when it detects that the `FlinkYarnSessionCli` would be used but it
failed to be loaded (the `isActive` method).
2. change of the error message in the `YarnJobClusterExecutorFactory` and
the `YarnSessionClusterExecutorFactory` when the executor cannot be
instantiated. This is to cover for the case where the user tries to access a
Yarn cluster through the `ExecutorCLI`.
## Verifying this change
Was verified manually and also added the `FallbackYarnSessionCliTest`.
## 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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