SpringBoot + Hadoop + HDFS + Vue 实现一个简单的文件管理系统

1. 安装前的准备工作

1.1 更新系统并安装必要的工具

在终端中运行以下命令：

sudo apt-get update
sudo apt-get install -y ssh rsync curl

1.2 安装 Java

如果系统中没有安装 Java，可以通过以下命令安装 OpenJDK：

sudo apt-get install -y openjdk-8-jdk

验证 Java 是否安装成功：

java -version

1.3 配置 SSH 无密码登录

Hadoop 需要通过 SSH 进行节点间通信。首先，生成 SSH 密钥对：

ssh-keygen -t rsa -P "" -f ~/.ssh/id_rsa

然后，将公钥添加到授权密钥列表中：

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

测试无密码登录：

ssh localhost

2. 下载和安装 Hadoop

2.1 下载 Hadoop

访问 Apache Hadoop 的官方网站并下载最新的稳定版本。你可以使用 curl 命令下载：

curl -O https://downloads.apache.org/hadoop/common/hadoop-3.3.6/hadoop-3.3.6.tar.gz

2.2 解压 Hadoop

下载完成后，解压 Hadoop 压缩包：

tar -xzvf hadoop-3.3.6.tar.gz

2.3 配置环境变量

编辑 ~/.bashrc(当前用户目录下，也就是用户的目录)添加 Hadoop 的环境变量：

export HADOOP_HOME=/home/hdfs/hadoop-3.3.6
export HADOOP_HDFS_HOME=$HADOOP_HOME
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

保存文件并刷新环境变量：

source ~/.bashrc

3. 配置 Hadoop

3.1 配置 core-site.xml

编辑 $HADOOP_HOME/etc/hadoop/core-site.xml 文件，设置默认文件系统为 HDFS：

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>

3.2 配置 hdfs-site.xml

编辑 $HADOOP_HOME/etc/hadoop/hdfs-site.xml`，设置远程访问地址，以及namenode。

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
    <!-- 设置数据副本数 -->
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>

    <!-- NameNode的存储目录 -->
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>file:///home/hdfs/hadoop-3.3.6/namenode</value>
    </property>

    <!-- NameNode的RPC地址 -->
    <property>
        <name>dfs.namenode.rpc-address</name>
        <value>0.0.0.0:9000</value>
    </property>

    <!-- DataNode的存储目录 -->
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>file:///home/hdfs/hadoop-3.3.6/datanode</value>
    </property>
</configuration>

3.1 确定 Java 安装目录

sudo update-alternatives --config java

3.4 配置 JAVA_HOME

编辑 $HADOOP_HOME/etc/hadoop/hadoop-env.sh文件，配置 JAVA_HOME 设置：

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

4. 启动 HDFS

4.1 格式化 NameNode

在首次启动 HDFS 之前，需要格式化 NameNode：

hdfs namenode -format

4.2 启动 HDFS

启动 NameNode 和 DataNode 服务：

start-dfs.sh 

你可以使用以下命令检查进程是否启动成功：

jps

正常情况下，你应该会看到 NameNode 和 DataNode 进程在运行。

结束进程：

kill -9 pid #可以先通过jps查看进程，再杀掉

4.3 验证 HDFS

你可以通过浏览器访问 NameNode 的 Web UI，地址是：

http://192.168.186.77:9870

4.4 查看数据节点状态

hdfs dfsadmin -report 

5. 项目结构

5.1 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.3.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>org.example</groupId>
    <artifactId>hdfs_hadoop</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>3.3.6</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

5.2 HdfsHadoopApplication.java

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class HdfsHadoopApplication {

    public static void main(String[] args) {
        SpringApplication.run(HdfsHadoopApplication.class, args);
    }
}

5.3 HDFSService.java

package org.example.service;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.example.model.SimpleFileStatusDTO;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.*;

@Service
public class HDFSService {
    private static final String HDFS_URI = "hdfs://192.168.186.77:9000";
    private static final String BASE_DIR = "/home"; // HDFS 上的基本目录
    private final FileSystem fileSystem;

    // 构造函数，初始化 FileSystem
    public HDFSService() throws IOException, InterruptedException {
        Configuration configuration = new Configuration();
        configuration.set("fs.defaultFS", HDFS_URI);

        // 设置环境变量，指定 HDFS 用户
        System.setProperty("HADOOP_USER_NAME", "liber");

        // 初始化 FileSystem
        this.fileSystem = FileSystem.get(URI.create(HDFS_URI), configuration);
    }

    // 1. 上传文件到 HDFS
    public void uploadFile(MultipartFile file, String subDirectory) throws IOException {
        // 生成新的文件名，避免重名冲突
        String originalFilename = file.getOriginalFilename();
        String newFilename = UUID.randomUUID() + "_" + originalFilename;

        // 目标目录路径
        String targetDirectory = BASE_DIR + (subDirectory.startsWith("/") ? subDirectory : "/" + subDirectory);
        Path directoryPath = new Path(targetDirectory);

        // 如果目录不存在，创建目录
        if (!fileSystem.exists(directoryPath)) {
            fileSystem.mkdirs(directoryPath);
        }

        // 目标文件路径
        Path destinationPath = new Path(targetDirectory + "/" + newFilename);

        // 上传文件
        try (FSDataOutputStream outputStream = fileSystem.create(destinationPath)) {
            outputStream.write(file.getBytes());
        }
    }

    // 2. 删除文件或目录
    public void deleteFile(String hdfsPath) throws IOException {
        fileSystem.delete(new Path(BASE_DIR+"/"+hdfsPath), true);
    }

    // 3. 列出目录内容
    public Map<String,Object> listFiles(String subDirectory) throws IOException {
        String directoryPath = BASE_DIR + (subDirectory.startsWith("/") ? subDirectory : "/" + subDirectory);
        FileStatus[] fileStatuses = fileSystem.listStatus(new Path(directoryPath));
        List<SimpleFileStatusDTO> fileStatusDTOList = new ArrayList<>();
        for (FileStatus fileStatus : fileStatuses) {
            fileStatusDTOList.add(new SimpleFileStatusDTO(fileStatus));
        }
        Map<String,Object> map=new HashMap<>();
        map.put("basePath", subDirectory);
        map.put("files", fileStatusDTOList);
        return map;
    }


    // 4. 创建目录
    public void createDirectory(String subDirectory) throws IOException {
        String targetDirectory = BASE_DIR + (subDirectory.startsWith("/") ? subDirectory : "/" + subDirectory);
        Path path = new Path(targetDirectory);
        if (!fileSystem.exists(path)) {
            fileSystem.mkdirs(path);
        } else {
            throw new IOException("Directory already exists: " + targetDirectory);
        }
    }


    // 5. 下载文件
    public InputStream readFileAsStream(String hdfsFilePath) throws IOException {
        Path path = new Path(BASE_DIR+hdfsFilePath);
        return fileSystem.open(path);
    }

    // 6. 重命名文件或目录
    public void rename(String sourceSubDirectory, String destSubDirectory) throws IOException {
        String sourcePath = BASE_DIR + (sourceSubDirectory.startsWith("/") ? sourceSubDirectory : "/" + sourceSubDirectory);
        String destPath = BASE_DIR + (destSubDirectory.startsWith("/") ? destSubDirectory : "/" + destSubDirectory);

        Path src = new Path(sourcePath);
        Path dst = new Path(destPath);
        if (!fileSystem.rename(src, dst)) {
            throw new IOException("Failed to rename: " + sourcePath + " to " + destPath);
        }
    }
}

5.4 SimpleFileStatusDTO.java

package org.example.model;

import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.hadoop.fs.FileStatus;

@Data
@NoArgsConstructor
public class SimpleFileStatusDTO {
    private String pathSuffix;
    private long length;
    private boolean isDirectory;
    public SimpleFileStatusDTO(FileStatus fileStatus) {
        String pathSuffix = fileStatus.getPath().toString();
        this.pathSuffix = pathSuffix.substring(pathSuffix.lastIndexOf("/")+1);
        this.length = fileStatus.getLen();
        this.isDirectory = fileStatus.isDirectory();
    }
}

5.5 HDFSController.java

package org.example.controller;

import org.example.service.HDFSService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.InputStreamResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.Map;

@RestController
@RequestMapping("/hdfs")
public class HDFSController {

    private final HDFSService hdfsService;

    @Autowired
    public HDFSController(HDFSService hdfsService) {
        this.hdfsService = hdfsService;
    }

    // 1. 上传文件
    @PostMapping("/upload")
    public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file,
                                                   @RequestParam("hdfsDirectory") String hdfsDirectory) {
        try {
            hdfsService.uploadFile(file, hdfsDirectory);
            return ResponseEntity.ok("上传成功");
        } catch (IOException e) {
            return ResponseEntity.status(500).body(null);
        }
    }

    // 2. 下载文件
    @GetMapping("/download")
    public ResponseEntity<InputStreamResource> downloadFile(@RequestParam("hdfsFilePath") String hdfsFilePath) {
        try {
            String filename = hdfsFilePath.substring(hdfsFilePath.lastIndexOf("/") + 1);
            InputStreamResource resource = new InputStreamResource(hdfsService.readFileAsStream(hdfsFilePath));
            return ResponseEntity.ok()
                    .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + filename + "\"")
                    .body(resource);
        } catch (IOException e) {
            return ResponseEntity.status(500).body(null);
        }
    }

    // 3. 删除文件或目录
    @DeleteMapping("/delete")
    public ResponseEntity<String> deleteFile(@RequestParam("hdfsPath") String hdfsPath) {
        try {
            hdfsService.deleteFile(hdfsPath);
            return ResponseEntity.ok("File deleted successfully");
        } catch (IOException e) {
            return ResponseEntity.status(500).body("Failed to delete file: " + e.getMessage());
        }
    }

    // 4. 列出目录内容
    @GetMapping("/list")
    public ResponseEntity<Map<String, Object>> listFiles(@RequestParam("directoryPath") String directoryPath) {
        try {
            Map<String, Object> files = hdfsService.listFiles(directoryPath);
            return ResponseEntity.ok(files);
        } catch (IOException e) {
            return ResponseEntity.status(500).body(null);
        }
    }

    // 5. 创建目录
    @PostMapping("/mkdir")
    public ResponseEntity<String> createDirectory(@RequestParam("directoryPath") String directoryPath) {
        try {
            hdfsService.createDirectory(directoryPath);
            return ResponseEntity.ok("Directory created successfully");
        } catch (IOException e) {
            return ResponseEntity.status(500).body("Failed to create directory: " + e.getMessage());
        }
    }

    // 6. 重命名文件或目录
    @PostMapping("/rename")
    public ResponseEntity<String> rename(@RequestParam("sourcePath") String sourcePath,
                                         @RequestParam("destPath") String destPath) {
        try {
            hdfsService.rename(sourcePath, destPath);
            return ResponseEntity.ok("File renamed successfully");
        } catch (IOException e) {
            return ResponseEntity.status(500).body("Failed to rename file: " + e.getMessage());
        }
    }
}

5.6 application.yml

spring:
  application:
    name: hdfs_hadoop
  servlet:
    multipart:
      max-file-size: 1024MB
      max-request-size: 1024MB

5.7 index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>HDFS 文件管理</title>
    <!-- Vue.js CDN -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2"></script>
    <!-- Axios CDN 用于 HTTP 请求 -->
    <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
    <!-- Bootstrap CDN 用于样式 -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        .current-path {
            font-weight: bold;
            font-size: 1.2em;
            margin-bottom: 15px;
        }
        .go-up-item {
            background-color: #f8f9fa;
            cursor: pointer;
        }
        .go-up-item:hover {
            background-color: #e2e6ea;
        }
        .file-item {
            cursor: pointer;
        }
        .file-item:hover {
            background-color: #f1f3f5;
        }
        .btn-icon {
            background-color: transparent;
            border: none;
            color: #007bff;
            cursor: pointer;
            padding: 0.2rem;
        }
        .btn-icon:hover {
            color: #0056b3;
        }
        .form-inline {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
        }
        .form-inline input {
            flex: 1;
        }
    </style>
</head>
<body>
<div id="app" class="container mt-5">
    <h1 class="mb-4">HDFS 文件管理</h1>

    <!-- 目录列表、创建目录和上传文件 -->
    <div class="mb-3">
        <h4>管理目录</h4>
        <div class="current-path">
            <span>📁 {{ currentPath }}</span>
        </div>

        <!-- 创建目录的内联表单 -->
        <div class="form-inline">
            <input type="text" v-model="newDirectoryPath" placeholder="新目录名称" class="form-control">
            <button @click="createDirectory" class="btn btn-info">创建目录</button>
            <button @click="showUploadDialog" class="btn btn-primary ms-2">上传文件</button>
        </div>

        <ul class="list-group">
            <li v-if="currentPath !== '/'" @click="goUpOneLevel" class="list-group-item go-up-item">
                <strong>🔙 返回上一级</strong>
            </li>
            <li v-for="file in files" :key="file.pathSuffix" class="list-group-item d-flex justify-content-between align-items-center file-item">
                <div @click="file.directory ? onDirectoryClick(file) : null">
                    <span v-if="file.directory">📁</span>
                    <span v-else>📄</span>
                    {{ file.pathSuffix }}
                    <!-- 当是文件时显示文件大小 -->
                    <span v-if="!file.directory" class="text-muted">({{ formatFileSize(file.length) }})</span>
                </div>
                <div>
                    <button @click="showRenameDialog(file)" class="btn-icon">
                        <span>✏️</span>
                    </button>
                    <button v-if="file.directory" @click="deleteFile(currentPath + '/' + file.pathSuffix)" class="btn-icon">
                        <span>🗑️</span>
                    </button>
                    <button v-if="!file.directory" @click="downloadFile(currentPath + '/' + file.pathSuffix)" class="btn-icon">
                        <span>⬇️</span>
                    </button>
                    <button v-if="!file.directory" @click="deleteFile(currentPath + '/' + file.pathSuffix)" class="btn-icon">
                        <span>🗑️</span>
                    </button>
                </div>
            </li>
        </ul>
    </div>

    <!-- 上传文件的模态框 -->
    <div class="modal" tabindex="-1" role="dialog" id="uploadModal">
        <div class="modal-dialog" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">上传文件</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                </div>
                <div class="modal-body">
                    <input type="file" @change="onFileChange" class="form-control">
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">关闭</button>
                    <button type="button" class="btn btn-primary" @click="handleUpload">上传</button>
                </div>
            </div>
        </div>
    </div>

    <!-- 重命名的模态框 -->
    <div class="modal" tabindex="-1" role="dialog" id="renameModal">
        <div class="modal-dialog" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">重命名</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                </div>
                <div class="modal-body">
                    <input type="text" v-model="renameNewName" class="form-control">
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">关闭</button>
                    <button type="button" class="btn btn-primary" @click="handleRename">重命名</button>
                </div>
            </div>
        </div>
    </div>
</div>

<script>
    new Vue({
        el: '#app',
        data: {
            uploadFile: null,
            currentPath: '/',  // 当前目录路径
            newDirectoryPath: '',
            files: [],
            renameFile: null,  // 需要重命名的文件或目录
            renameNewName: '', // 新名称
        },
        methods: {
            // 处理文件选择
            onFileChange(event) {
                this.uploadFile = event.target.files[0];
            },
            // 显示上传模态框
            showUploadDialog() {
                const modal = new bootstrap.Modal(document.getElementById('uploadModal'));
                modal.show();
            },
            // 显示重命名模态框
            showRenameDialog(file) {
                this.renameFile = file;
                this.renameNewName = file.pathSuffix;
                const modal = new bootstrap.Modal(document.getElementById('renameModal'));
                modal.show();
            },
            // 上传文件
            async handleUpload() {
                try {
                    const formData = new FormData();
                    formData.append('file', this.uploadFile);
                    formData.append('hdfsDirectory', this.currentPath);
                    await axios.post('/hdfs/upload', formData, {
                        headers: {
                            'Content-Type': 'multipart/form-data'
                        }
                    });
                    this.listFiles();  // 上传后刷新文件列表
                    const modal = bootstrap.Modal.getInstance(document.getElementById('uploadModal'));
                    modal.hide(); // 上传后隐藏模态框
                } catch (error) {
                    console.error('上传文件时出错:', error);
                }
            },
            // 重命名文件或目录
            async handleRename() {
                try {
                    const sourcePath = this.currentPath + '/' + this.renameFile.pathSuffix;
                    const destPath = this.currentPath + '/' + this.renameNewName;
                    await axios.post('/hdfs/rename', null, {
                        params: { sourcePath, destPath }
                    });
                    this.listFiles();  // 重命名后刷新文件列表
                    const modal = bootstrap.Modal.getInstance(document.getElementById('renameModal'));
                    modal.hide(); // 重命名后隐藏模态框
                } catch (error) {
                    console.error('重命名文件或目录时出错:', error);
                }
            },
            // 列出目录中的文件
            async listFiles() {
                try {
                    const response = await axios.get('/hdfs/list', {
                        params: { directoryPath: this.currentPath }
                    });
                    this.files = response.data.files; // 取出 files 数组
                    this.currentPath = response.data.basePath; // 更新当前路径
                } catch (error) {
                    console.error('列出文件时出错:', error);
                }
            },
            // 下载文件
            async downloadFile(filePath) {
                try {
                    const response = await axios.get('/hdfs/download', {
                        params: { hdfsFilePath: filePath },
                        responseType: 'blob'
                    });
                    const url = window.URL.createObjectURL(new Blob([response.data]));
                    const link = document.createElement('a');
                    link.href = url;
                    link.setAttribute('download', filePath.split('/').pop());
                    document.body.appendChild(link);
                    link.click();
                } catch (error) {
                    console.error('下载文件时出错:', error);
                }
            },
            // 删除文件或目录
            async deleteFile(filePath) {
                try {
                    await axios.delete('/hdfs/delete', {
                        params: { hdfsPath: filePath }
                    });
                    this.listFiles(); // 刷新文件列表
                } catch (error) {
                    console.error('删除文件或目录时出错:', error);
                }
            },
            // 创建新目录
            async createDirectory() {
                try {
                    await axios.post('/hdfs/mkdir', null, {
                        params: { directoryPath: this.currentPath + '/' + this.newDirectoryPath }
                    });
                    this.newDirectoryPath = ''; // 清空输入框
                    this.listFiles(); // 创建目录后刷新文件列表
                } catch (error) {
                    console.error('创建目录时出错:', error);
                }
            },
            // 返回上一级目录
            goUpOneLevel() {
                const pathParts = this.currentPath.split('/').filter(part => part);
                if (pathParts.length > 1) {
                    pathParts.pop();
                    this.currentPath = '/' + pathParts.join('/');
                } else {
                    this.currentPath = '/';
                }
                this.listFiles(); // 刷新文件列表
            },
            // 进入一个目录
            onDirectoryClick(file) {
                if (!this.currentPath.endsWith('/')) {
                    this.currentPath += '/';
                }
                if (!this.currentPath.endsWith(file.pathSuffix)) {
                    this.currentPath += file.pathSuffix;
                }
                this.listFiles(); // 刷新文件列表以显示点击的目录的内容
            },
            // 格式化文件大小
            formatFileSize(size) {
                if (size < 1024) return size + ' B';
                else if (size < 1048576) return (size / 1024).toFixed(2) + ' KB';
                else if (size < 1073741824) return (size / 1048576).toFixed(2) + ' MB';
                else return (size / 1073741824).toFixed(2) + ' GB';
            }
        },
        mounted() {
            this.listFiles(); // 页面加载时加载初始目录中的文件
        }
    });
</script>
<!-- Bootstrap JS 用于模态框 -->
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.10.2/dist/umd/popper.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js"></script>
</body>
</html>

6. 测试验证

6.1 创建目录

6.2 创建结果

6.3 上传文件

6.4 上传结果

6.5 重命名测试

6.6 重命名结果

6.7 其他

删除，下载等不再赘余。

6.8 查看HDFS默认的文件管理

7、遇到错误

第1个错误

java.io.FileNotFoundException: HADOOP_HOME and hadoop.home.dir are unset.

下载对应版本的原生文件：https://github.com/cdarlint/winutils

然后修改下面内容到系统环境即可。

HADOOP_HOME=D:\hadoop-3.3.6\bin
%HADOOP_HOME%\bin

重要的话要说三遍：记得重启，记得重启，记得重启IDEA编译器。

第2个错误

Engine2 : Call: addBlock took 169ms

2024-08-11T19:14:22.716+08:00 DEBUG 13116 --- [hdfs_hadoop] [ Thread-5] org.apache.hadoop.hdfs.DataStreamer : pipeline = [DatanodeInfoWithStorage[127.0.0.1:9866,DS-d52f1df8-88e2-4807-bc48-842e7b9f07a2,DISK]], blk_1073741826_1002

2024-08-11T19:14:22.716+08:00 DEBUG 13116 --- [hdfs_hadoop] [ Thread-5] org.apache.hadoop.hdfs.DataStreamer : Connecting to datanode 127.0.0.1:9866

2024-08-11T19:14:22.718+08:00 WARN 13116 --- [hdfs_hadoop] [ Thread-5] org.apache.hadoop.hdfs.DataStreamer : Exception in createBlockOutputStream blk_1073741826_1002

java.net.ConnectException: Connection refused: getsockopt

at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]

at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:682) ~[na:na]

org.apache.hadoop.ipc.RemoteException: File /home/7dff6c94-88d2-4b62-83b9-92f93253b473_01.jpg could only be written to 0 of the 1 minReplication nodes. There are 1 datanode(s) running and 1 node(s) are excluded in this operation .

at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:2350)

说明：一开始，我以为一个时间节点不行，后来想试一下集群还是不行，最后通过以下方式进行修改：

编辑 /etc/hosts 文件：

sudo nano /etc/hosts

• 我是把liber-vmware-virtual-platform 改为 192.168.186.77 连接成功，不然默认是127.0.0.1。

重要的话要说三遍：记得重启，记得重启，记得重启Ubuntu。

8. 总结

​ 基于Ubuntu24.04 TLS 安装Hadoop以及配置HDFS，通过Spring Boot 和 Vue 实现一个简单的文件管理系统。