作业提交后的 ClassNotFoundException [英] ClassNotFoundException after job submission
本文介绍了作业提交后的 ClassNotFoundException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试 Spring Data - Hadoop 在从我的本地机器的 IDE 远程集群
I'm trying out Spring Data - Hadoop for executing the MR code on a remote cluster from my local machine's IDE
//Hadoop 1.1.2、Spring 3.2.4、Spring-Data-Hadoop 1.0.0
//Hadoop 1.1.2, Spring 3.2.4, Spring-Data-Hadoop 1.0.0
尝试使用这些版本:
Hadoop 1.2.1、Spring 4.0.1、Spring-Data-Hadoop 2.0.2
applicationContext.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"
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/hadoop http://www.springframework.org/schema/hadoop/spring-hadoop.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<context:property-placeholder location="resources/hadoop.properties" />
<hdp:configuration file-system-uri="${hd.fs}" job-tracker-uri="${hd.jobtracker.uri}">
</hdp:configuration>
<hdp:job id="wc-job" mapper="com.hadoop.basics.WordCounter.WCMapper"
reducer="com.hadoop.basics.WordCounter.WCReducer" input-path="${wordcount.input.path}"
output-path="${wordcount.output.path}" user="bigdata">
</hdp:job>
<hdp:job-runner id="myjobs-runner" job-ref="wc-job"
run-at-startup="true" />
<hdp:resource-loader id="resourceLoader" uri="${hd.fs}"
user="bigdata" />
</beans>
WordCounter.java:
package com.hadoop.basics;
import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class WordCounter {
private static IntWritable one = new IntWritable(1);
public static class WCMapper extends Mapper<Text, Text, Text, IntWritable> {
@Override
protected void map(
Text key,
Text value,
org.apache.hadoop.mapreduce.Mapper<Text, Text, Text, IntWritable>.Context context)
throws IOException, InterruptedException {
// TODO Auto-generated method stub
StringTokenizer strTokenizer = new StringTokenizer(value.toString());
Text token = new Text();
while (strTokenizer.hasMoreTokens()) {
token.set(strTokenizer.nextToken());
context.write(token, one);
}
}
}
public static class WCReducer extends
Reducer<Text, IntWritable, Text, IntWritable> {
@Override
protected void reduce(
Text key,
Iterable<IntWritable> values,
org.apache.hadoop.mapreduce.Reducer<Text, IntWritable, Text, IntWritable>.Context context)
throws IOException, InterruptedException {
// TODO Auto-generated method stub
int sum = 0;
for (IntWritable value : values) {
sum += value.get();
}
context.write(key, new IntWritable(sum));
}
}
public static void main(String[] args) {
AbstractApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml", WordCounter.class);
System.out.println("Word Count Application Running");
context.registerShutdownHook();
}
}
输出是:
Aug 23, 2013 11:07:48 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1815338: startup date [Fri Aug 23 11:07:48 IST 2013]; root of context hierarchy
Aug 23, 2013 11:07:48 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [com/hadoop/basics/applicationContext.xml]
Aug 23, 2013 11:07:48 AM org.springframework.core.io.support.PropertiesLoaderSupport loadProperties
INFO: Loading properties file from class path resource [resources/hadoop.properties]
Aug 23, 2013 11:07:48 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7c197e: defining beans [org.springframework.context.support.PropertySourcesPlaceholderConfigurer#0,hadoopConfiguration,wc-job,myjobs-runner,resourceLoader]; root of factory hierarchy
Aug 23, 2013 11:07:49 AM org.springframework.data.hadoop.mapreduce.JobExecutor$2 run
INFO: Starting job [wc-job]
Aug 23, 2013 11:07:49 AM org.apache.hadoop.mapred.JobClient copyAndConfigureFiles
WARNING: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String).
Aug 23, 2013 11:07:49 AM org.apache.hadoop.mapreduce.lib.input.FileInputFormat listStatus
INFO: Total input paths to process : 1
Aug 23, 2013 11:07:50 AM org.apache.hadoop.util.NativeCodeLoader <clinit>
WARNING: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Aug 23, 2013 11:07:50 AM org.apache.hadoop.io.compress.snappy.LoadSnappy <clinit>
WARNING: Snappy native library not loaded
Aug 23, 2013 11:07:52 AM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: Running job: job_201308231532_0002
Aug 23, 2013 11:07:53 AM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: map 0% reduce 0%
Aug 23, 2013 11:08:12 AM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: Task Id : attempt_201308231532_0002_m_000000_0, Status : FAILED
java.lang.RuntimeException: java.lang.ClassNotFoundException: com.hadoop.basics.WordCounter$WCMapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:849)
at org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:719)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.ClassNotFoundException: com.hadoop.basics.WordCounter$WCMapper
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:802)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:847)
... 8 more
Aug 23, 2013 11:08:33 AM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: Task Id : attempt_201308231532_0002_m_000000_1, Status : FAILED
java.lang.RuntimeException: java.lang.ClassNotFoundException: com.hadoop.basics.WordCounter$WCMapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:849)
at org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:719)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.ClassNotFoundException: com.hadoop.basics.WordCounter$WCMapper
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:802)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:847)
... 8 more
Aug 23, 2013 11:08:51 AM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: Task Id : attempt_201308231532_0002_m_000000_2, Status : FAILED
java.lang.RuntimeException: java.lang.ClassNotFoundException: com.hadoop.basics.WordCounter$WCMapper
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:849)
at org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:719)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.ClassNotFoundException: com.hadoop.basics.WordCounter$WCMapper
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:802)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:847)
... 8 more
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: Job complete: job_201308231532_0002
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Counters: 7
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Job Counters
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: SLOTS_MILLIS_MAPS=86688
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Total time spent by all reduces waiting after reserving slots (ms)=0
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Total time spent by all maps waiting after reserving slots (ms)=0
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Launched map tasks=4
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Data-local map tasks=4
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: SLOTS_MILLIS_REDUCES=0
Aug 23, 2013 11:09:24 AM org.apache.hadoop.mapred.Counters log
INFO: Failed map tasks=1
Aug 23, 2013 11:09:24 AM org.springframework.data.hadoop.mapreduce.JobExecutor$2 run
INFO: Completed job [wc-job]
Aug 23, 2013 11:09:24 AM org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7c197e: defining beans [org.springframework.context.support.PropertySourcesPlaceholderConfigurer#0,hadoopConfiguration,wc-job,myjobs-runner,resourceLoader]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myjobs-runner': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Job wc-job] failed to start; status=FAILED
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1482)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:197)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:172)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:158)
at com.hadoop.basics.WordCounter.main(WordCounter.java:58)
Caused by: java.lang.IllegalStateException: Job wc-job] failed to start; status=FAILED
at org.springframework.data.hadoop.mapreduce.JobExecutor$2.run(JobExecutor.java:219)
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:49)
at org.springframework.data.hadoop.mapreduce.JobExecutor.startJobs(JobExecutor.java:168)
at org.springframework.data.hadoop.mapreduce.JobExecutor.startJobs(JobExecutor.java:160)
at org.springframework.data.hadoop.mapreduce.JobRunner.call(JobRunner.java:52)
at org.springframework.data.hadoop.mapreduce.JobRunner.afterPropertiesSet(JobRunner.java:44)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1541)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1479)
... 13 more
什么配置.我错过了吗?真的可以使用 Spring Data 远程提交 Hadoop 作业而不创建 jar 等吗?
What config. have I missed? Is it really possible to submit a Hadoop job remotely using Spring Data without creation of a jar etc. ?
推荐答案
我遇到了同样的问题，然后分离了 mapper 和 reducer 类的工作，并且在 applicationContext.xml 中进行了以下更改:
I was getting the same issue then separating the mapper and reducer class works and the following changes were done in applicationContext.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:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:hdp="http://www.springframework.org/schema/hadoop" xmlns:batch="http://www.springframework.org/schema/batch"
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
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">
<context:property-placeholder location="classpath:application.properties" />
<hdp:configuration namenode-principal="hdfs://xx.yy.com" rm-manager-uri="xx.yy.com"
security-method="kerb" user-keytab="location" rm-manager-principal="username"
user-principal="username">
fs.default.name=${fs.default.name}
mapred.job.tracker=${mapred.job.tracker}
</hdp:configuration>
<hdp:job id="wordCountJobId" input-path="${input.path}"
output-path="${output.path}" jar-by-class="com.xx.poc.Application"
mapper="com.xx.poc.Map" reducer="com.xx.poc.Reduce" />
<hdp:job-runner id="wordCountJobRunner" job-ref="wordCountJobId"
run-at-startup="true" />
</beans>
这篇关于作业提交后的 ClassNotFoundException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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