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mysql5.7.4的文档里有一句话：

http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-4.html

Replication: Implemented separate threads for sending and receiving semisynchronous replication acknowledgement signals, so that event streams and ACK streams can be sent and received simultaneously. This should reduce many common delays and thus improve performance with semisynchronous replication in a number of settings. 

可以用pstack观察一下mysqld进程：

实际测试了下，有了这个东西后，半同步架构下的整体TPS有了不小的提升。

转载自： http://blog.51cto.com/weikle/1792233

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