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windows下使用Eclipse编译运行MapReduce程序 Hadoop2.6.0/Ubuntu(二)

2021-03-28 Windows程序

标签:eclipse编写hadoop程序   hadoop   

在上篇文章中eclipse已经能访问HDFS目录,但并不能进行Mapreduce编程,,在这里小编将常见错误和处理办法进行总结,希望对大家有所帮助

错误1ERROR [main] util.Shell (Shell.java:getWinUtilsPath(303)) - Failed to locate the winutils binary in the hadoop binary path  
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

解决办法:

eg:我解压的目录是D:\hadoop-2.6.0

在系统的环境变量界面添加HADOOP_HOME,并在系统变量PATH中添加如图:

技术分享

技术分享

然后eclipse中选择Windows->Prefenences设置如图:

技术分享

错误2:Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

错误3:Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.access0(Ljava/lang/String;I)Z

上面两个问题是缺少组件,解决办法:

下载hadoop-common-2.2.0-bin-master

将里边bin 目录替换 本地hadoop里边的bin目录


错误:4:

15/08/03 10:15:43 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
15/08/03 10:15:43 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
15/08/03 10:15:55 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
15/08/03 10:15:57 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
15/08/03 10:15:59 INFO ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8032. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

解决办法:

将集群配置文件中core-site.xml  localhost改为你主节点IP

然后加入在yarn-site.xml中加入

<property> <name>yarn.resourcemanager.address</name> <value>127.0.0.1:8032</value> </property> <property> <name>yarn.resourcemanager.scheduler.address</name> <value>127.0.0.1:8030</value> </property> <property> <name>yarn.resourcemanager.resource-tracker.address</name> <value>127.0.0.1:8031</value> </property> <property> <name>yarn.resourcemanager.hostname</name> <value>127.0.0.1</value> </property> 注意127.0.0.1改为你的ip

特别注意的是,修改后,集群要重新启动,且把里边的修改的文件重新copy一份到程序的src目录下,在eclipse中刷新

错误5:

Exit code: 1
Exception message: /bin/bash: 第 0 行: fg: 无任务控制

Stack trace: ExitCodeException exitCode=1: /bin/bash: 第 0 行: fg: 无任务控制

解决办法参考网上给的教程: 并未解决

真正的办法是:


在客户端配置文件中添加如下属性:

<property> <name>mapreduce.app-submission.cross-platform</name> <value>true</value> </property>

注意:必须添加到Hadoop程序读取的客户端本地配置文件中,添加到客户端Hadoop安装路径中的“core-site.xml”,“mapred-site.xml”等文件中不起作用



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