环境：Win 7 32bit
1、修改hadoop-1.0.3\src\contrib\build-contrib.xml，添加<property name="version" value="1.0.3"/>和<property name="eclipse.home" value="d:\\eclipse"/>
2、在hadoop-1.0.3目录下运行ant compile -logfile error.log，会出现错误：
compile-hdfs-classes:
[javac] D:\hadoop\hadoop-1.0.3\build.xml:576: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
[javac] Compiling 1 source file to D:\hadoop\hadoop-1.0.3\build\classes
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:5: 未结束的字符串字面值
[javac] user="jackdministrator
[javac] ^
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:6: 需要为 class、interface 或 enum
[javac] ", date="Sat Jul 7 21:00:12 2012", url="",
[javac] ^
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:6: 需要为 class、interface 或 enum
[javac] ", date="Sat Jul 7 21:00:12 2012", url="",
[javac] ^
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:6: 未结束的字符串字面值
[javac] ", date="Sat Jul 7 21:00:12 2012", url="",
[javac] ^
[javac] 4 错误
解决方法：修改D:\hadoop\hadoop-1.0.3\src、saveVersion.sh文件，把user=`whoami`改成user=`hadoop`
3、再次运行ant命令
D:\hadoop\hadoop-1.0.3\build.xml:618: Execute failed: java.io.IOException: Cannot run program "autoreconf" (in directory "D:\hadoop\hadoop-1.0.3\src\native"): CreateProcess error=2, ?????????
解决方法：在cygwin中安装autoconf automake libtool
在安装完软件后依旧报该错误，所以决定使用真实的linux环境进行编译。
环境：CentOS 5.6 x84_64
1、修改hadoop-1.0.3\src\contrib\build-contrib.xml，添加<property name="version" value="1.0.3"/>和<property name="eclipse.home" value="/download/eclipse"/>
2、在hadoop-1.0.3目录下运行ant compile -logfile error.log，会出现错误：
D:\hadoop\hadoop-1.0.3\build.xml:618: Execute failed: java.io.IOException: Cannot run program "autoreconf" (in directory "D:\hadoop\hadoop-1.0.3\src\native"): CreateProcess error=2, ?????????
解决方法：yum install autoconf automake libtool
3、再次编译，顺利通过。切换到hadoop-1.0.3\src\contrib\eclipse-plugin目录，执行ant compile -logfile error.log，顺利通过。
如果编译时遇到以下问题：
ivy-download:
[get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar
[get] To: /home/hdpusr/workspace/hadoop-1.0.1/ivy/ivy-2.1.0.jar
[get] Error getting http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar to /home/hdpusr/workspace/hadoop-1.0.1/ivy/ivy-2.1.0.jar
BUILD FAILED
java.net.ConnectException: Connection timed out
可以使用命令 ant compile -Doffline=true
ant jar前要把以下jar拷贝到相应位置，否则放入eclipse后会报以下异常：
An internal error occurred during: "Map/Reduce location status updater".
org/codehaus/jackson/map/JsonMappingException
[hadoop@jack lib]$ pwd
/data/soft/hadoop/build/contrib/eclipse-plugin/lib
[hadoop@jack lib]$ ls
commons-cli-1.2.jar commons-httpclient-3.0.1.jar hadoop-core.jar jackson-mapper-asl-1.8.8.jar
commons-configuration-1.6.jar commons-lang-2.4.jar jackson-core-asl-1.8.8.jar
Cannot connect to the Map/Reduce location: hadoop
java.io.IOException: Unknown protocol to DataNode: org.apache.hadoop.mapred.JobSubmissionProtocol
at org.apache.hadoop.hdfs.server.datanode.DataNode.getProtocolVersion(DataNode.java:1759)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)
4、把hadoop-1.0.3\hadoop-core-1.0.3.jar拷贝到hadoop-1.0.3\build目录下，在hadoop-1.0.3\src\contrib\eclipse-plugin目录中执行ant jar。
5、在hadoop-1.0.3\build\contrib\eclipse-plugin目录存放已经编译好的hadoop-eclipse-plugin-1.0.3.jar，详见附件
检查hadoop-eclipse-plugin-1.0.3.jar配置文件，必须包含之前拷贝的jar包
拷贝到eclilpse后，在eclipse的菜单栏
Windows-->Preferences-->Hadoop Map/Reduce中配置好hadoop的home目录
2、在hadoop-1.0.3目录下运行ant compile -logfile error.log，会出现错误：
compile-hdfs-classes:
[javac] D:\hadoop\hadoop-1.0.3\build.xml:576: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
[javac] Compiling 1 source file to D:\hadoop\hadoop-1.0.3\build\classes
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:5: 未结束的字符串字面值
[javac] user="jackdministrator
[javac] ^
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:6: 需要为 class、interface 或 enum
[javac] ", date="Sat Jul 7 21:00:12 2012", url="",
[javac] ^
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:6: 需要为 class、interface 或 enum
[javac] ", date="Sat Jul 7 21:00:12 2012", url="",
[javac] ^
[javac] D:\hadoop\hadoop-1.0.3\build\src\org\apache\hadoop\package-info.java:6: 未结束的字符串字面值
[javac] ", date="Sat Jul 7 21:00:12 2012", url="",
[javac] ^
[javac] 4 错误
解决方法：修改D:\hadoop\hadoop-1.0.3\src、saveVersion.sh文件，把user=`whoami`改成user=`hadoop`
3、再次运行ant命令
D:\hadoop\hadoop-1.0.3\build.xml:618: Execute failed: java.io.IOException: Cannot run program "autoreconf" (in directory "D:\hadoop\hadoop-1.0.3\src\native"): CreateProcess error=2, ?????????
解决方法：在cygwin中安装autoconf automake libtool
在安装完软件后依旧报该错误，所以决定使用真实的linux环境进行编译。
1、修改hadoop-1.0.3\src\contrib\build-contrib.xml，添加<property name="version" value="1.0.3"/>和<property name="eclipse.home" value="d:\\eclipse"/>