mosche opened a new pull request, #17406:
URL: https://github.com/apache/beam/pull/17406

   Usage of `forkEvery 1` is typically a strong sign of poor quality / bad code 
and should be avoided: 
   
   - It often hides resource leaks, either in code or worse, potentially in the 
runner itself.
   - It significantly impacts performance when running tests.
   
   This PR introduces new JUnit rules to better manage the lifecyle of 
`SparkContext` or `SparkContextOptions` and allows to safely reuse those for 
all tests of a suite where applicable. The previous `ReuseSparkContextRule` 
leaks the SparkContext and was removed. Besides, with `forkEvery 1` trying to 
reuse the `SparkContext` is absolutely pointless ...
   
   There's might be more issues hidden I didn't discover locally ... I'll keep 
a look.
   
   This also reduce the runtime of tests to ~30 secs from 1:30+ mins.
   
   
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