SpringBoot定時監(jiān)聽RocketMQ的NameServer問題及解決方案

更新時間：2023年12月26日 11:35:07 作者：starjuly

這篇文章主要介紹了SpringBoot定時監(jiān)聽RocketMQ的NameServer問題及解決方案,本文給大家介紹的非常詳細(xì),對大家的學(xué)習(xí)或工作具有一定的參考借鑒價值,需要的朋友參考下吧

問題分析

自己在測試環(huán)境部署了RocketMQ，發(fā)現(xiàn)namesrv很容易掛掉，于是就想著監(jiān)控，掛了就發(fā)郵件通知。
查看了rocketmq-dashboard項(xiàng)目，發(fā)現(xiàn)只能監(jiān)控Broker，遂放棄這一路徑。
于是就從報錯的日志入手，發(fā)現(xiàn)最終可以根據(jù)RocketMQTemplate獲得可活動的NameServer。

報錯日志

報錯日志如下：

12月 25 13:59:22 192.168.240.65 java[59571]: 2023-12-25 13:59:22.598 INFO 59571 --- [tWorkerThread_2] RocketmqRemoting : NETTY CLIENT PIPELINE: CLOSE 192.168.240.86:9876
12月 25 13:59:22 192.168.240.65 java[59571]: 2023-12-25 13:59:22.598 INFO 59571 --- [tWorkerThread_2] RocketmqRemoting : closeChannel: the channel[192.168.240.86:9876] was removed from channel table
12月 25 13:59:22 192.168.240.65 java[59571]: 2023-12-25 13:59:22.598 INFO 59571 --- [tWorkerThread_2] RocketmqRemoting : NETTY CLIENT PIPELINE: CLOSE 192.168.240.86:9876
12月 25 13:59:22 192.168.240.65 java[59571]: 2023-12-25 13:59:22.598 INFO 59571 --- [tWorkerThread_2] RocketmqRemoting : eventCloseChannel: the channel[null] has been removed from the channel table before
12月 25 13:59:22 192.168.240.65 java[59571]: 2023-12-25 13:59:22.598 INFO 59571 --- [lientSelector_1] RocketmqRemoting : closeChannel: close the connection to remote address[192.168.240.86:9876] result: true
12月 25 13:59:25 192.168.240.65 java[59571]: 2023-12-25 13:59:25.597 INFO 59571 --- [ntScan_thread_1] RocketmqRemoting : createChannel: begin to connect remote host[192.168.240.86:9876] asynchronously
12月 25 13:59:25 192.168.240.65 java[59571]: 2023-12-25 13:59:25.597 INFO 59571 --- [tWorkerThread_3] RocketmqRemoting : NETTY CLIENT PIPELINE: CONNECT UNKNOWN => 192.168.240.86:9876
12月 25 13:59:25 192.168.240.65 java[59571]: 2023-12-25 13:59:25.598 WARN 59571 --- [ntScan_thread_1] RocketmqRemoting : createChannel: connect remote host[192.168.240.86:9876] failed, AbstractBootstrap$PendingRegistrationPromise@f2a3fc5(failure: io.netty.channel.AbstractChannel$AnnotatedConnectException: 拒絕連接: /192.168.240.86:9876)

根據(jù)日志可以發(fā)現(xiàn)是NettyRemotingClient類在做監(jiān)控，持續(xù)調(diào)用，具體核心方法：

org.apache.rocketmq.remoting.netty.NettyRemotingClient#createChannel

createChannel的源碼：

private Channel createChannel(String addr) throws InterruptedException {
        NettyRemotingClient.ChannelWrapper cw = (NettyRemotingClient.ChannelWrapper)this.channelTables.get(addr);
        if (cw != null && cw.isOK()) {
            return cw.getChannel();
        } else {
            if (this.lockChannelTables.tryLock(3000L, TimeUnit.MILLISECONDS)) {
                try {
                    cw = (NettyRemotingClient.ChannelWrapper)this.channelTables.get(addr);
                    boolean createNewConnection;
                    if (cw != null) {
                        if (cw.isOK()) {
                            Channel var4 = cw.getChannel();
                            return var4;
                        }
                        if (!cw.getChannelFuture().isDone()) {
                            createNewConnection = false;
                        } else {
                            this.channelTables.remove(addr);
                            createNewConnection = true;
                        }
                    } else {
                        createNewConnection = true;
                    }
                    if (createNewConnection) {
                        ChannelFuture channelFuture = this.bootstrap.connect(RemotingHelper.string2SocketAddress(addr));
                        LOGGER.info("createChannel: begin to connect remote host[{}] asynchronously", addr);
                        cw = new NettyRemotingClient.ChannelWrapper(channelFuture);
                        this.channelTables.put(addr, cw);
                    }
                } catch (Exception var8) {
                    LOGGER.error("createChannel: create channel exception", var8);
                } finally {
                    this.lockChannelTables.unlock();
                }
            } else {
                LOGGER.warn("createChannel: try to lock channel table, but timeout, {}ms", 3000L);
            }
            if (cw != null) {
                ChannelFuture channelFuture = cw.getChannelFuture();
                if (channelFuture.awaitUninterruptibly((long)this.nettyClientConfig.getConnectTimeoutMillis())) {
                    if (cw.isOK()) {
                        LOGGER.info("createChannel: connect remote host[{}] success, {}", addr, channelFuture.toString());
                        return cw.getChannel();
                    }
                    LOGGER.warn("createChannel: connect remote host[" + addr + "] failed, " + channelFuture.toString());
                } else {
                    LOGGER.warn("createChannel: connect remote host[{}] timeout {}ms, {}", new Object[]{addr, this.nettyClientConfig.getConnectTimeoutMillis(), channelFuture.toString()});
                }
            }
            return null;
        }
    }

從源碼中可以看到報錯的日志數(shù)據(jù)

追溯

以NettyRemotingClient類為起點(diǎn)，使用Debug分析，最終可以看到完整的調(diào)用鏈路：

監(jiān)控開發(fā)

那么監(jiān)控開發(fā)就很容易了，注冊RocketMQTemplate，使用定時任務(wù)監(jiān)聽即可，示例代碼如下：

@Slf4j
@Component
public class MQMonitorTask {
    @Resource
    private RocketMQTemplate rocketMQTemplate;
    @Scheduled(cron = "0/10 * * * * ?")
    public void scanNameServerBroker() {
        org.apache.rocketmq.remoting.RemotingClient remotingClient = rocketMQTemplate.getProducer()
                .getDefaultMQProducerImpl().getMqClientFactory().getMQClientAPIImpl().getRemotingClient();
        // 注冊的 NameServer
        List<String> nameServerAddressList = remotingClient.getNameServerAddressList();
        // 當(dāng)前活躍的 NameServer
        List<String> availableNameSrvList = remotingClient.getAvailableNameSrvList();
        log.info("nameServerAddressList:{}", JSONUtil.toJsonStr(nameServerAddressList));
        log.info("availableNameSrvList:{}", JSONUtil.toJsonStr(availableNameSrvList));
        // 只要 nameServerAddressList 和 availableNameSrvList 大小不一致，即可做郵件通知，具體閾值自己設(shè)置?。?！
        // TODO:郵件通知
    }
}

另外要在SprongBoot啟動類加上注解@EnableScheduling來開啟定時任務(wù)。

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