[SPARK-37891] Add scalastyle check to disable scala.concurrent.ExecutionContext.Implicits.global

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.2.0
• Fix Version/s: 3.2.2
• Component/s: Spark Core
• Assignee: Tianhan Hu
• Reporter: Tianhan Hu
• Created: 13/Jan/22 03:39
• Updated: 24/Jan/22 20:24
• Resolved: 24/Jan/22 20:23

Description

Add scalastyle check to disable internal use of scala.concurrent.ExecutionContext.Implicits.global.
The reason is that user queries can also use this thread pool, causing competing in resource and starvation. Spark-internal APIs should thus not use the global thread pool.

Issue Links

• links to: [Github] Pull Request #35187 (tianhanhu)
• links to: [Github] Pull Request #35187 (tianhanhu)