java如何在zookeeper、创建一个临时顺序节点
时间: 2023-12-29 17:06:08 浏览: 141
要在ZooKeeper中使用Java创建一个临时顺序节点,您可以使用`CreateMode.EPHEMERAL_SEQUENTIAL`模式。这将创建一个临时节点,并在节点名称后附加一个自动递增的序列号。
以下是一个示例代码,它创建一个名为“test”的临时顺序节点:
```
import org.apache.zookeeper.*;
import org.apache.zookeeper.ZooDefs.Ids;
import java.util.concurrent.CountDownLatch;
public class ZooKeeperExample {
private static final int SESSION_TIMEOUT = 5000;
private static CountDownLatch connectedSignal = new CountDownLatch(1);
public static void main(String[] args) throws Exception {
// connect to ZooKeeper
ZooKeeper zk = new ZooKeeper("localhost:2181", SESSION_TIMEOUT, new Watcher() {
public void process(WatchedEvent event) {
if (event.getState() == Event.KeeperState.SyncConnected) {
connectedSignal.countDown();
}
}
});
connectedSignal.await();
// create an ephemeral sequential node
String path = "/ephemeral/test-";
byte[] data = "test data".getBytes();
String createdPath = zk.create(path, data, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);
System.out.println("Created node: " + createdPath);
// close the connection
zk.close();
}
}
```
这将在ZooKeeper上创建一个名为“/ephemeral/test-0000000000”的临时顺序节点,其中包含“test data”作为节点数据。每次运行此代码时,都会创建一个新的节点,名称以自动递增的序列号结尾。请注意,当客户端断开连接时,该节点将被删除。
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