使用 spring data hadoop 写入 HDFS 时出现问题

Question

我正在尝试使用 spring data hadoop 将简单文本写入 HDFS。但是我在写作时遇到了一个未知问题。

Exception in thread "main" org.springframework.data.hadoop.store.StoreException: Store output context not yet initialized; nested exception is java.io.IOException: Unexpected HTTP response: code=404 != 200, op=GETFILESTATUS, message=Not Found at org.springframework.data.hadoop.store.support.OutputStoreObjectSupport.getOutputContext(OutputStoreObjectSupport.java:135) at org.springframework.data.hadoop.store.output.AbstractDataStreamWriter.getOutput(AbstractDataStreamWriter.java:131) at org.springframework.data.hadoop.store.output.TextFileWriter.write(TextFileWriter.java:132) at com.mstack.app.MainApp.someMethod(MainApp.java:37) at com.mstack.app.MainApp.main(MainApp.java:32) Caused by: java.io.IOException: Unexpected HTTP response: code=404 != 200, op=GETFILESTATUS, message=Not Found at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:347) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access0(WebHdfsFileSystem.java:90) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.runWithRetry(WebHdfsFileSystem.java:613) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.access0(WebHdfsFileSystem.java:463) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:492) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$AbstractRunner.run(WebHdfsFileSystem.java:488) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHdfsFileStatus(WebHdfsFileSystem.java:848) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getFileStatus(WebHdfsFileSystem.java:858) at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1424) at org.springframework.data.hadoop.store.support.OutputStoreObjectSupport.findInitFiles(OutputStoreObjectSupport.java:111) at org.springframework.data.hadoop.store.support.OutputStoreObjectSupport.initOutputContext(OutputStoreObjectSupport.java:93) at org.springframework.data.hadoop.store.support.OutputStoreObjectSupport.getOutputContext(OutputStoreObjectSupport.java:133) ... 4 more Caused by: java.io.IOException: Content-Type "text/plain" is incompatible with "application/json" (parsed="text/plain") at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.jsonParse(WebHdfsFileSystem.java:320) at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:343) ... 18 more

我的申请-context.xml:-

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


    <hdp:configuration id="hadoopConfigBean">
        fs.defaultFS=${hdp.fs}
    </hdp:configuration>

    <context:annotation-config />
    <beans:bean id="textFileWriter"
        class="org.springframework.data.hadoop.store.output.TextFileWriter">
        <beans:constructor-arg index="0" ref="hadoopConfigBean"></beans:constructor-arg>
        <beans:constructor-arg index="1"
            type="org.apache.hadoop.fs.Path" value="/user/mhduser"></beans:constructor-arg>
        <beans:constructor-arg index="2" type="org.springframework.data.hadoop.store.codec.CodecInfo" >
        <beans:null></beans:null>
        </beans:constructor-arg>
    </beans:bean>

    <context:property-placeholder location="hadoop-configs.properties" />
</beans:beans>

主要class:-

public class MainApp {

    @Autowired
    TextFileWriter textFileWriter;

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("/META-INF/spring/application-context.xml",
                MainApp.class);
        System.out.println("Context loaded...");
        MainApp obj = new MainApp();
        context.getAutowireCapableBeanFactory().autowireBean(obj);
        obj.someMethod();
    }

    private void someMethod() {
        try {
            textFileWriter.write("Something");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

如有任何帮助，我们将不胜感激！谢谢

Answer 1

我们这里有一些样品https://github.com/spring-projects/spring-hadoop-samples. Thought nothing store specific so I created a simple gist based on Spring Boot which can be run via its CLI. https://gist.github.com/jvalkeal/8145f0618f25c1d25d19f4e1e89de1e6

也值得看看我们在单元测试中做了什么https://github.com/spring-projects/spring-hadoop/tree/master/spring-hadoop-store/src/test/java/org/springframework/data/hadoop/store

使用 spring data hadoop 写入 HDFS 时出现问题

Issue when writing to HDFS using spring data hadoop

spring

hadoop

spring-data

spring-data-hadoop