ueshin opened a new pull request #28986:
URL: https://github.com/apache/spark/pull/28986
### What changes were proposed in this pull request?
This PR proposes to disallow to create `SparkContext` in executors, e.g., in
UDFs.
### Why are the changes needed?
Currently executors can create SparkContext, but shouldn't be able to create
it.
```scala
sc.range(0, 1).foreach { _ =>
new SparkContext(new SparkConf().setAppName("test").setMaster("local"))
}
```
### Does this PR introduce _any_ user-facing change?
Yes, uses won't be able to create `SparkContext` in executors.
### How was this patch tested?
Addes tests.
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