dongjoon-hyun opened a new pull request, #37849:
URL: https://github.com/apache/spark/pull/37849
### What changes were proposed in this pull request?
This PR aims to remove the support of `spark.akka.*` configs.
### Why are the changes needed?
- Apache Spark 2.0+ is not using Akka, but some of `spark.akka.*` configs
are still accepted as alternative values from deprecated configs.
- Due to the Akka's License change, we had better be clear that Apache Spark
is irrelevant to Akka even in config names.
- https://www.lightbend.com/blog/why-we-are-changing-the-license-for-akka
### Does this PR introduce _any_ user-facing change?
Yes, we will ignore `spark.akka.*`, but it's inevitable in order to remove
any confusions due to the config naming, `spark.akka.*`.
### How was this patch tested?
Manually review.
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