错误一: Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class wordCount.wordCount$Map not found at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2074) at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperCl…

按此文章<Hadoop集群(第7期)_Eclipse开发环境设置>进行MapReduce开发环境搭建的过程中遇到一些问题,饶了一些弯路,解决办法记录在此: 文档目的: 记录windows环境下Eclipse开发MapReduce程序遇到的四个问题及解决办法: 问题一:程序运行时报JobTracker is in safe mode: security.UserGroupInformation: PriviledgedActionException as:hadoop cause:org.apa…

Eclipse执行项目提示错误: unable to execute dex: GC orerhead limit exceeded 解决方法: 找到Eclipse安装目录的文件,\eclipse\eclipse.ini 打开把 launcher.appendVmargs-vmargs-Dosgi.requiredJavaVersion=1.6-Xms40m-Xmx512m- 修改为: launcher.appendVmargs-vmargs-Dosgi.requiredJavaVersion=…

现象: node manager起不来, 执行mapreduce 程序hang住 namenode 进程状态查询[root@hadp-master sbin]# jps8608 ResourceManager8257 NameNode9268 Jps8453 SecondaryNameNode datanode 进程状态查询 , 发现 nodemanager 没有起来[root@hadp-node1 hadoop]# jps4179 DataNode4940 Jps namenode 单独起 n…

异常现象: 打开Eclipse,出现 An internal error occurred during: "Initializing Java Tooling". java.lang.NullPointerException 错误弹框: 出现原因: 不合理的关闭eclipse才发生的错误: 解决办法: 删除程序的工作空间下的.project文件 具体路径: workspace\.metadata\.plugins\org.eclipse.core.resources\.project…

一.环境介绍 宿主机:windows8 虚拟机:Ubuntu14.04 hadoop2.6伪分布:搭建教程http://blog.csdn.net/gamer_gyt/article/details/46793731 Eclipse:eclipse-jee-luna-SR2-win32-x86_64 二.准备阶段 网上下载hadoop-eclipse-plugin-2.6.0.jar (点击下载) 也能够自行编译(网上教程挺多的,能够自己百度 or Google) 三.begin 复制编译好的j…

来自:http://blog.csdn.net/hezuoxiang/article/details/6878026 写了个mapreduce的JAVA程序,自定义了个partition class indexPartition extends HashPartitioner<Text, Text>{ public int getPartition(Text key, Text value,int numReduceTasks) {  Text tmp = new Text(key.toStr…

按照文档:http://www.micmiu.com/bigdata/hadoop/hadoop2x-eclipse-mapreduce-demo/安装配置好Eclipse后,运行WordCount程序报错: log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j…

报错信息 17/07/06 17:00:27 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.17/07/06 17:00:27 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf…

1.报HDFS权限不够:org.apache.hadoop.security.AccessControlException: Permission denied:user=ouqiping, access=WRITE, inode="/user/Administrator/DatingRecommender/ratings.dat":root:supergroup:drwxr-xr-x 解决办法: 到服务器上修改hadoop的配置文件:conf/hdfs-core.xml, 找到 df…