连接kafka时,经常遇到配置kafka连接信息连接失败,程序后台一直打印连接失败信息,或者由于连接不上kafka程序启动直接失败情况,考虑一种方案如下:
从从zookeeper中读取kafka集群信息,如果kafka集群信息中有配置的kafka连接信息,则说明kafka正常启动,已注册到zookeeper,可正常连接
贴上代码如下:
public static void main(String[] args) throws Exception { getNodes(); } public static void getNodes() throws Exception { CuratorFramework client = CuratorFrameworkFactory .newClient(connectString, 1000*60, 1000*15, new RetryNTimes(10,5000)); client.start();//开始连接 CuratorFrameworkState st = client.getState(); System.out.println(st); List<String> children = client.getChildren().usingWatcher(new CuratorWatcher() { @Override public void process(WatchedEvent event) throws Exception { System.out.println("监控: " + event); } }).forPath("/brokers/ids"); if (ValidateUtil.isNotEmpty(children)) { for (String id : children) { //String brokerInfo = new String(client.getData("/brokers/ids/" + id)); System.out.println("current Id:"+id); //返回的字节数组 byte[] o= client.getData().usingWatcher(new CuratorWatcher() { @Override public void process(WatchedEvent event) throws Exception { LOGGER.info("触发watcher, path:{}", event.getPath()); } }).forPath("/brokers/ids/" + id); System.out.println("o:"+o); String b = new String(o); System.out.println("current node content:"+b); } } System.out.println(children); String result = client.create().withMode(CreateMode.PERSISTENT).withACL(ZooDefs.Ids.OPEN_ACL_UNSAFE).forPath("/test", "Data".getBytes()); System.out.println(result); // 设置节点数据 client.setData().forPath("/test", "111".getBytes()); client.setData().forPath("/test", "222".getBytes()); // 删除节点 System.out.println(client.checkExists().forPath("/test")); client.delete().withVersion(-1).forPath("/test"); System.out.println(client.checkExists().forPath("/brokers")); client.close(); System.out.println("OK!"); client.getCuratorListenable().addListener(new CuratorListener() { @Override public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception { System.out.println("事件: " + event); } }); client.getConnectionStateListenable().addListener(new ConnectionStateListener() { @Override public void stateChanged(CuratorFramework client, ConnectionState newState) { System.out.println("连接状态事件: " + newState); } }); client.getUnhandledErrorListenable().addListener(new UnhandledErrorListener() { @Override public void unhandledError(String message, Throwable e) { System.out.println("错误事件:" + message); } }); }
参照资料:
1、动态从zookeeper中读取kafka集群
2、Spring Boot 使用 Curator 操作 ZooKeeper
3、Springboot2(29)集成zookeeper的增删改查、节点监听、分布式读写锁、分布式计数器
4、springboot搭建连接zookeeper