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Re:Scala projects are difficult to maintain by MrPowers on Monday March 22, 2021 @10:50AM (#26541622)
Upgrading Spark from Scala 2.11 to Scala 2.12 was a huge effort. See here for more discussion: https://contributors.scala-lang.org/t/spark-as-a-scala-gatew...

Some projects are easier to upgrade, but for complex projects, minor Scala version bumps can be quite challenging.

Re:Scala projects are difficult to maintain by AheadOfTime295 on Monday March 22, 2021 @12:46PM (#26543283)
And the story goes on: upgrading Spark to Scala 2.13 https://issues.apache.org/jira/browse/SPARK-25075