Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/18281 I agree; it'd be good to match on the Param name. Do you think "parallelism" is too vague? If not, then I like it since it's simple. I'd vote for default parallelism of 1 to be safe (match current CrossValidator behavior). We can change this PR to use 1 as well for uniformity. Do we really need to expose the ability to pass in an ExecutorService? Given how few people have requested any kind of parallelism, I have a hard time imagining people needing to pass in an ExecutorService. If one of you has a need for it, I guess that's fine, but I'd recommend it be marked as a DeveloperApi and clearly documented (e.g., not saved by persistence, etc.).
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