sweb commented on PR #58010:
URL: https://github.com/apache/spark/pull/58010#issuecomment-6271957397

   > The escaping and the new substitution sentence look good. The PR 
description hasn't caught up with 
[ae1664f](https://github.com/apache/spark/commit/ae1664f2d2ad87f4f8c512f864c3365600177965)
 yet, and it becomes the commit message: What changes could say that injected 
values are written with `$` doubled because Kubernetes expands `$(VAR)` and 
`$$` in env values; the `BasicExecutorFeatureStepSuite` list is missing `SSL 
RPC passwords are escaped for Kubernetes env var expansion`; and the 
user-facing sentence on variable substitution could say that both the 
referenced variable and the matching `_SPARK_SSL_RPC_*` variable have to be 
bound on the executors.
   
   Thank you for pointing this out! I added this part to the first paragraph:
   
   ```
   The values are written with `$` doubled, because Kubernetes expands `$(VAR)` 
and `$$` in `EnvVar.value`. After expansion the executor reads the exact 
password.
   ```


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