[SPARK-19810] Remove support for Scala 2.10

• Type: Task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.3.0
• Component/s: ML, Spark Core, SQL
• Target Version/s: 2.3.0
• Assignee: Sean R. Owen
• Reporter: Sean R. Owen
• Created: 03/Mar/17 12:33
• Updated: 04/Sep/18 00:57
• Resolved: 13/Jul/17 09:07

Description

This tracks the removal of Scala 2.10 support, as discussed in http://apache-spark-developers-list.1001551.n3.nabble.com/Straw-poll-dropping-support-for-things-like-Scala-2-10-td19553.html and other lists.

The primary motivations are to simplify the code and build, and to enable Scala 2.12 support later.

Issue Links

• blocks: SPARK-14220 Build and test Spark against Scala 2.12
• relates to: SPARK-8577 ScalaReflectionLock.synchronized can cause deadlock
• relates to: SPARK-10719 SQLImplicits.rddToDataFrameHolder is not thread safe when using Scala 2.10
• supercedes: SPARK-20395 Update Scala to 2.11.11 and zinc to 0.3.15
• links to: [Github] Pull Request #17150 (srowen)
• links to: [Github] Pull Request #18646 (srowen)
• links to: [Github] Pull Request #18703 (srowen)