RocketMQ4.3.X关于设置useEpollNativeSelector = true报错问题

前一阵子刚整理完rocketmq4.3.x版本的相关配置的工作，接下来就来测试一下改变参数会带来什么好的结果

首先我就选中了useepollnativeselector 这个参数

默认这个参数是 false

这个参数的意思就是是否启用epoll io模型。linux环境建议开启

然后我就打开了这个参数试试看看会不会生效

首先是namesrv 弄了一个配置文件指向启动

然后启动namesrv

sh bin/mqnamesrv -c conf/namesrv.conf 

很不幸抛出了一个异常

java.lang.illegalstateexception: incompatible event loop type: io.netty.channel.nio.nioeventloop
	at io.netty.channel.abstractchannel$abstractunsafe.register(abstractchannel.java:411)
	at io.netty.channel.singlethreadeventloop.register(singlethreadeventloop.java:72)
	at io.netty.channel.singlethreadeventloop.register(singlethreadeventloop.java:60)
	at io.netty.channel.multithreadeventloopgroup.register(multithreadeventloopgroup.java:64)
	at io.netty.bootstrap.abstractbootstrap.initandregister(abstractbootstrap.java:320)
	at io.netty.bootstrap.abstractbootstrap.dobind(abstractbootstrap.java:271)
	at io.netty.bootstrap.abstractbootstrap.bind(abstractbootstrap.java:235)
	at org.apache.rocketmq.remoting.netty.nettyremotingserver.start(nettyremotingserver.java:212)
	at org.apache.rocketmq.namesrv.namesrvcontroller.start(namesrvcontroller.java:156)
	at org.apache.rocketmq.namesrv.namesrvstartup.start(namesrvstartup.java:154)
	at org.apache.rocketmq.namesrv.namesrvstartup.main0(namesrvstartup.java:58)
	at org.apache.rocketmq.namesrv.namesrvstartup.main(namesrvstartup.java:51)

 

通过抛出的异常追查一下源码

源码位置

发现在执行构造函数的时候初始化的是下面代码 90-143行

public nettyremotingserver(final nettyserverconfig nettyserverconfig,
        final channeleventlistener channeleventlistener) {
        super(nettyserverconfig.getserveronewaysemaphorevalue(), nettyserverconfig.getserverasyncsemaphorevalue());
        this.serverbootstrap = new serverbootstrap();
        this.nettyserverconfig = nettyserverconfig;
        this.channeleventlistener = channeleventlistener;

        int publicthreadnums = nettyserverconfig.getservercallbackexecutorthreads();
        if (publicthreadnums <= 0) {
            publicthreadnums = 4;
        }

        this.publicexecutor = executors.newfixedthreadpool(publicthreadnums, new threadfactory() {
            private atomicinteger threadindex = new atomicinteger(0);

            @override
            public thread newthread(runnable r) {
                return new thread(r, "nettyserverpublicexecutor_" + this.threadindex.incrementandget());
            }
        });

        this.eventloopgroupboss = new nioeventloopgroup(1, new threadfactory() {
            private atomicinteger threadindex = new atomicinteger(0);

            @override
            public thread newthread(runnable r) {
                return new thread(r, string.format("nettyboss_%d", this.threadindex.incrementandget()));
            }
        });

        if (useepoll()) {
            this.eventloopgroupselector = new epolleventloopgroup(nettyserverconfig.getserverselectorthreads(), new threadfactory() {
                private atomicinteger threadindex = new atomicinteger(0);
                private int threadtotal = nettyserverconfig.getserverselectorthreads();

                @override
                public thread newthread(runnable r) {
                    return new thread(r, string.format("nettyserverepollselector_%d_%d", threadtotal, this.threadindex.incrementandget()));
                }
            });
        } else {
            this.eventloopgroupselector = new nioeventloopgroup(nettyserverconfig.getserverselectorthreads(), new threadfactory() {
                private atomicinteger threadindex = new atomicinteger(0);
                private int threadtotal = nettyserverconfig.getserverselectorthreads();

                @override
                public thread newthread(runnable r) {
                    return new thread(r, string.format("nettyservernioselector_%d_%d", threadtotal, this.threadindex.incrementandget()));
                }
            });
        }

        loadsslcontext();
    }

也就是说这里接收链接的线程池 eventloopgroupboss 永远都是 nioeventloopgroup  如果设置了useepollnativeselector=true就会初始化epolleventloopgroup这个类处理请求

这样就会造成两种线程模型的不兼容状态

导致出现异常 java.lang.illegalstateexception: incompatible event loop type: io.netty.channel.nio.nioeventloop

 

---

按常理说阿里的人不会出现这样的低级错误啊

回头又看了看github的bug列表果然有人提这个问题bug还是开启状态

 

？？？？为什么？

难道是我使用配置有问题吗？还是哪里理解有误那？知道的网友可以告诉我啊！！！！