[SPARK-4265] Better extensibility for TaskEndReason

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Component/s: Spark Core
• Labels: api-change
• Assignee: Unassigned
• Reporter: Shixiong Zhu
• Created: 06/Nov/14 05:50
• Updated: 08/Jan/16 10:50
• Resolved: 08/Jan/16 10:50

Description

Now all subclasses of TaskEndReason are case classes. As per discussion in https://github.com/apache/spark/pull/3073#discussion_r19920257 , it's hard to extend them (such as add/remove fields) without breaks compatibility for matching.

It's better to change them to regular classes for extensibility.