[SPARK-8101] Upgrade netty to avoid memory leak accord to netty #3837 issues

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.4.0
• Fix Version/s: 1.5.0
• Component/s: Spark Core
• Assignee: Sean R. Owen
• Reporter: SuYan
• Created: 04/Jun/15 12:56
• Updated: 21/Jul/15 06:40
• Resolved: 09/Jun/15 07:00

Description

There is a direct buffer leak in netty, due to netty 4.0.23-Final not release threadlocal after netty already send message success.

Please Ref: https://github.com/netty/netty/issues/3837

Issue Links

• relates to: SPARK-9212 update Netty version to "4.0.29.Final" for Netty Metrics
• links to: [Github] Pull Request #6701 (srowen)