由于工作需要,需要拿到目前叢集的Active Namenode的Ip位址,是以寫以下小代碼,防止忘記,記錄一下:
import java.io.IOException;
import java.net.InetSocketAddress;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.HAUtil;
public class ActiveNNAdd {
public void getNameNodeAdress() throws Exception {
Configuration conf = new Configuration();
FileSystem system = null;
try {
system = FileSystem.get(conf);
InetSocketAddress active = HAUtil.getAddressOfActive(system);
System.out.println(active.getHostString());
// System.out.println("hdfs port:" + active.getPort());
// InetAddress address = active.getAddress();
// System.out.println("hdfs://" + address.getHostAddress() + ":"+ active.getPort());
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (system != null) {
system.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
ActiveNNAdd nn = new ActiveNNAdd() ;
try {
nn.getNameNodeAdress();
} catch (Exception e) {
e.printStackTrace();
}
}
}
以上代碼是使用Hadoop源碼提供的HAUtil工具類來做的,有興趣的小夥伴還可以嘗試連接配接Zookeeper擷取!