sybernatus opened a new pull request, #37259:
URL: https://github.com/apache/spark/pull/37259
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### What changes were proposed in this pull request?
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I propose this PR to warn the user when he is not using correctly the spark
submit CLI.
The idea here is to add a control on duplicates arguments that should not be
duplicated.
As I don't know the project so much, I've just added this rule on the
following arguments :
- `--py-files`
- `--files`
I can add more arguments to the list of non duplicatable arguments if needed.
For example using `--files` argument, the argument can only appear once with
a list of files coma separated as value as follow :
```shell
spark-submit --files my-file,my-second-file
```
But if someone try to use it like below instead :
```shell
sparksubmit --files my-file --files my-second-file
```
Using multiple times the argument `--files`, will work without error but
only one of the files will be provided to spark.
It could be time consuming for user to understand why it works but not as
expected.
### Why are the changes needed?
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This change is put in place to facilitate the use of spark as it's already a
heavy project.
### Does this PR introduce _any_ user-facing change?
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Yes, user using duplicates arguments will now receive an error instead of
submitting to spark
### How was this patch tested?
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Test case has been added to the Spark launcher project.
:zap:
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