dennis zhuang

用户可指定备份间隔。

异步复制，在运行一段时间后出现offset错乱的问题，需测试重现下。

See https://cwiki.apache.org/confluence/display/KAFKA/Central+Consumer+Coordination

现在的group commit实现是利用单独的一个线程，考虑在写的线程上做group commit，减少线程数。

为协议添加版本信息，为未来添加更多协议做准备，做好向前兼容。

Date 日期格式错误

5

https://ticket.avosapps.com/tickets/54991c9fe4b046c781270e4e/threads

https://github.com/jepsen-io/jepsen/blob/master/doc/tutorial/08-set.md

Added setTimeout for XMLHttpRequest

4

We have to set request timeout in our production to avoid blocking too many requests.I added a method `setTimeout` for XMLHttpRequest.I hope it can be merged into master branch,then i...

Maybe we can add the link `http://{host}:{port}/metrics`to the status page or other places.