Guoqiang Li
authored
## What changes were proposed in this pull request? One of the important changes for 4.0.42.Final is "Support any FileRegion implementation when using epoll transport netty/netty#5825". In 4.0.42.Final, `MessageWithHeader` can work properly when `spark.[shuffle|rpc].io.mode` is set to epoll ## How was this patch tested? Existing tests Author: Guoqiang Li <witgo@qq.com> Closes #15830 from witgo/SPARK-18375_netty-4.0.42.