[SPARK-17649] Log how many Spark events got dropped in LiveListenerBus

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.6.3, 2.0.1, 2.1.0
• Component/s: Spark Core
• Assignee: Shixiong Zhu
• Reporter: Shixiong Zhu
• Created: 23/Sep/16 18:45
• Updated: 28/Sep/16 23:27
• Resolved: 26/Sep/16 17:45

Description

Log how many Spark events got dropped in LiveListenerBus so that the user can get insights on how to set a correct event queue size.

Issue Links

• links to: [Github] Pull Request #15220 (zsxwing)
• links to: [Github] Pull Request #15226 (zsxwing)