Java代码通过Kerberos连接HDFS

秒速五厘米 2024-04-28 13:03 8阅读 0赞

>     准备配置文件工作:
>     1. hdfs-site.xml , core-site.xml   从【集群中下载】
>     2. hadoop.keytab 【创建kerberos访问的用户生成】
>     3. krb5.conf  【配置Kerberos生成】
>     
>     
>     pom需要的依赖:
>         <dependencies>
>             <dependency>
>                 <groupId>org.apache.hadoop</groupId>
>                 <artifactId>hadoop-common</artifactId>
>                 <version>${hadoop.version}</version>
>             </dependency>
>     
>             <dependency>
>                 <groupId>org.apache.hadoop</groupId>
>                 <artifactId>hadoop-hdfs</artifactId>
>                 <version>${hadoop.version}</version>
>             </dependency>
>     
>             <dependency>
>                 <groupId>org.apache.hadoop</groupId>
>                 <artifactId>hadoop-client</artifactId>
>                 <version>${hadoop.version}</version>
>             </dependency>
>         </dependencies>
>     
>     
>     
>     
>     具体的代码实现
>     
>     package com.cib.feilong.kerber;
>     
>     import org.apache.hadoop.conf.Configuration;
>     import org.apache.hadoop.fs.FileSystem;
>     import org.apache.hadoop.fs.Path;
>     import org.apache.hadoop.security.UserGroupInformation;
>     
>     /**
>      * JAVA 代码通过Kerberos连接HDFS
>      *
>      * @author songzhan
>      * @version 1.0
>      * @date 2022/1/14
>      */
>     
>     public class Test {
>     
>         public static void main(String[] args) throws Exception {
>     
>             String user = "hadoop";
>     
>             String keytab = "/home/hadoop/hadoop.keytab";
>     
>             String path = "/tmp/";
>     
>             Configuration conf = new Configuration();
>     
>             conf.set("fs.hdfs.impl", "org.apache.hadoop.hdfs.DistributedFileSystem");
>     
>             System.setProperty("java.security.krb5.conf", "/etc/krb5.conf");
>     
>             UserGroupInformation.setConfiguration(conf);
>     
>             UserGroupInformation.loginUserFromKeytab(user, keytab);
>     
>             FileSystem fileSystem = FileSystem.get(conf);
>     
>             boolean exists = fileSystem.exists(new Path(path));
>     
>             // TODO  判断tmp目录是否存在，如果存在返回True,如果不存在返回False
>             System.out.println("exists:{}" + exists);
>     
>         }
>     
>     }