[SPARK-22087] Clear remaining compile errors for 2.12; resolve most warnings

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 2.3.0
• Component/s: Build, Spark Core
• Target Version/s: 2.3.0
• Assignee: Sean R. Owen
• Reporter: Sean R. Owen
• Created: 21/Sep/17 09:57
• Updated: 24/Sep/17 08:40
• Resolved: 24/Sep/17 08:40

Description

In the course of finishing SPARK-14650 I found there are still some compile problems and tens of avoidable warnings in 2.12 that can be fixed without, it seems, impacting the 2.11 build. There's enough work that I made a separate JIRA for it here.

It generally includes:

• Selecting Kafka 0.10.1+ for Scala 2.12 and patching over a minor API difference
• Fixing lots of "eta expansion of zero arg method deprecated" warnings
• Resolving the SparkContext.sequenceFile implicits compile problem
• Fixing an odd but valid jetty-server missing dependency in hive-thriftserver

Issue Links

• links to: [Github] Pull Request #19307 (srowen)