[GIRAPH-840] Upgrade to netty 4

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Assignee: Pavan Kumar
• Reporter: Pavan Kumar
• Created: 02/Feb/14 18:05
• Updated: 18/Mar/14 13:23
• Resolved: 19/Feb/14 23:28

Description

Off late netty 4 has earned so much praise in the community. For example,
https://blog.twitter.com/2013/netty-4-at-twitter-reduced-gc-overhead

A switch to netty 4 enables a significant reduction in gc pressure and also huge performance gains. I started working on this last Sunday and have a patch that shows performance gains on the order of 15-25% (total execution time) for some applications at Facebook. However, I only tested it with hadoop_facebook. So there might be issues with SASL path.

I will release the patch today and want to open up a discussion if anyone is using the secure feature anymore. If not we can just deprecate it.

Issue Links

• relates to: GIRAPH-871 Map task jvm never exits since netty 4 upgrade
• relates to: GIRAPH-872 Minor inconsistencies with netty handler logic after netty 4 upgrade