Spring 对 WebHDFS 的支持

Question

是否有任何 Spring 支持 wedhdfs？我没有在谷歌上找到任何有用的链接。

我想通过 webhdfs 连接到具有正常身份验证和 kerberos 身份验证的 hadoop。 spring 支持吗？

任何有用的链接都会有帮助。

谢谢

Answer 1

是的，Spring Data 支持这个。根据此文档，可以配置任何受支持的 Hadoop 文件系统:

http://docs.spring.io/spring-hadoop/docs/current/reference/html/fs.html

SHDP does not enforce any specific protocol to be used - in fact, as described in this section any FileSystem implementation can be used, allowing even other implementations than HDFS to be used.

有关演示自动连接 WebHDFS 的代码示例，请参见下文 FileSystem实例到命令行应用程序中。要运行它，将文件路径作为命令行参数传递，它将通过调用 FileSystem.listStatus 列出该路径中存在的每个文件。 .

代码示例配置为使用“简单”身份验证连接到不安全的 WebHDFS 实例。要连接到受 Kerberos 保护的 WebHDFS 实例，您需要在 <hdp:configuration id="hadoopConfiguration" /> 中设置相关的配置属性。 bean 。 Hadoop 安全配置是一个很大的话题。我不再重复这些信息，而是指向 Apache 中的文档:

http://hadoop.apache.org/docs/r2.4.1/hadoop-project-dist/hadoop-common/SecureMode.html

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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>test-spring-hadoop</groupId>
    <artifactId>test-webhdfs</artifactId>
    <packaging>jar</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>Test Spring Hadoop with WebHDFS</name>
    <description>Test Spring Hadoop with WebHDFS</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.1.0.RELEASE</version>
    </parent>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <url>http://repo.spring.io/libs-release</url>
        </repository>
    </repositories>

    <properties>
        <start-class>testwebhdfs.Main</start-class>
        <java.version>1.6</java.version>
        <hadoop.version>2.4.1</hadoop.version>
    </properties>

    <build>
        <plugins>            
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-hadoop</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <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>
    </dependencies>
</project>

src/main/resources/hadoop-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:hdp="http://www.springframework.org/schema/hadoop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                   http://www.springframework.org/schema/hadoop http://www.springframework.org/schema/hadoop/spring-hadoop.xsd">

    <hdp:configuration id="hadoopConfiguration" />
    <hdp:file-system uri="webhdfs://localhost:50070" />
</beans>

src/main/java/testwebhdfs/Main.java

package testwebhdfs;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;

@Configuration
@ImportResource("hadoop-context.xml")
public class Main implements CommandLineRunner {

    @Autowired
    private FileSystem fs;

    @Override
    public void run(String... strings) throws Exception {
        Path[] paths = new Path[strings.length];
        for (int i = 0; i < strings.length; ++i) {
            paths[i] = new Path(strings[i]);
        }
        for (FileStatus stat: fs.listStatus(paths)) {
            System.out.println(stat.getPath());
        }
    }

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