Github user maoling commented on the issue:
https://github.com/apache/zookeeper/pull/669
find a
[blog](https://blog.twitter.com/engineering/en_us/a/2013/netty-4-at-twitter-reduced-gc-overhead.html)
about the twitter's practice of moving netty3 to netty4 for Finagle.it
couldn't be better to give a benchmark like this:
> 5 times less frequent GC pauses: 45.5 vs. 9.2 times/min
> 5 times less garbage production: 207.11 vs 41.81 MiB/s---
