SpringBoot定时监听RocketMQ的NameServer问题及解决方案
作者：starjuly
问题分析
- 自己在测试环境部署了RocketMQ，发现namesrv很容易挂掉，于是就想着监控，挂了就发邮件通知。
- 查看了rocketmq-dashboard项目，发现只能监控Broker，遂放弃这一路径。
- 于是就从报错的日志入手，发现最终可以根据RocketMQTemplate获得可活动的NameServer。
报错日志
报错日志如下：
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: 拒绝连接: /192.168.240.86:9876)
根据日志可以发现是NettyRemotingClient类在做监控，持续调用，具体核心方法：
org.apache.rocketmq.remoting.netty.NettyRemotingClient#createChannel
createChannel的源码：
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;
}
}从源码中可以看到报错的日志数据
追溯
以NettyRemotingClient类为起点，使用Debug分析，最终可以看到完整的调用链路：
监控开发
那么监控开发就很容易了，注册RocketMQTemplate，使用定时任务监听即可，示例代码如下：
@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();
// 注册的 NameServer
List<String> nameServerAddressList = remotingClient.getNameServerAddressList();
// 当前活跃的 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，即可做邮件通知，具体阈值自己设置！！！
// TODO:邮件通知
}
}另外要在SprongBoot启动类加上注解@EnableScheduling来开启定时任务。
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