hadoop1.2.1下编译及安装eclipse4.2插件

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15. –>
29. encoding=”${build.encoding}”
30. srcdir=”${src.dir}”
31. includes=”**/*.java”
32. destdir=”${build.classes}”
33. debug=”${javac.debug}”
34. deprecation=”${javac.deprecation}”>
42. –>
51. jarfile=”${build.dir}/hadoop-${name}-${version}.jar”
52. manifest=”${root}/META-INF/MANIFEST.MF”>

5，修改build-contrib.xml文件

添加如下路径

6，修改META-INF/MANIFEST.MF文件

最终文件为：

1. Manifest-Version: 1.0
2. Bundle-ManifestVersion: 2
3. Bundle-Name: MapReduce Tools for Eclipse
4. Bundle-SymbolicName: org.apache.hadoop.eclipse;singleton:=true
5. Bundle-Version: 0.18
6. Bundle-Activator: org.apache.hadoop.eclipse.Activator
7. Bundle-Localization: plugin
8. Require-Bundle: org.eclipse.ui,
9. org.eclipse.core.runtime,
10. org.eclipse.jdt.launching,
11. org.eclipse.debug.core,
12. org.eclipse.jdt,
13. org.eclipse.jdt.core,
14. org.eclipse.core.resources,
15. org.eclipse.ui.ide,
16. org.eclipse.jdt.ui,
17. org.eclipse.debug.ui,
18. org.eclipse.jdt.debug.ui,
19. org.eclipse.core.expressions,
20. org.eclipse.ui.cheatsheets,
21. org.eclipse.ui.console,
22. org.eclipse.ui.navigator,
23. org.eclipse.core.filesystem,
24. org.apache.commons.logging
25. Eclipse-LazyStart: true
26. Bundle-ClassPath: classes/,lib/hadoop-core.jar,lib/jackson-core-asl-1.8.8.jar ,lib/jackson-mapper-asl-1.8.8.jar, lib/commons-configuration-1.6.jar,lib/commons-lang-2.4.jar, lib/commons-httpclient-3.0.1.jar,lib/commons-cli-1.2.jar
27. Bundle-Vendor: Apache Hadoop

7，保存完毕后，开始编译我们自己的插件。右击MapReduceTools工程，选择Properties，选择Builders，点击右侧的New，命名为Plugin_Builder，选择Ant Builder，BuildFile选择MapReduceTools里的build.xml文件，然后点击确定。

8，开始编译。点击eclipse的Project选项，选择Build Project，然后编译成功。编译后的jar文件放在hadoop安装目录下的build文件夹里，contrib下，有个hadoop-eclipse-1.2.1.jar文件，将其赋值到eclipse下的plugin里。

Ps.我在这里遇到了一个问题，有一个警告，说是无法复制hadoop目录下的hadoop-core-${version}.jar文件，我暂时没解决，但是好像没什么影响，只是生成的jar文件是hadoop-eclipse-${version}.jar文件，如果有其他人遇到并且解决了，麻烦告诉我一下，我的解决方法是将名字改正确然后复制过去的，发现也可以用。

9.打开eclipse，打开Window——Preferences，选择左侧的Hadoop Map/Reduce，然后指定自己安装的hadoop目录，点击确定。再打开Window——Open Perspective——other，选择MapReduce蓝色的小象，此时下方出现MapReduce Location，右键单击New Hadoop Location，开始配置hadoop变量。

10，进入New Hadoop location后，定义你的location name，然后选择和你的hadoop目录下core-site.xml文件一致的主机名和端口，并在Advanced parameters里找到两个重要的参数，

修改 hadoop.tmp.dir 为你 hadoop 集群中设置的目录
修改 dfs.replication 为你 hdfs-site.xml 文件中配置的值

然后确定。此时确保你的hadoop服务已经开启，接下来就可以在左侧的DFS Location下找到你hadoop环境下的目录，以后如果编译程序也会很方便。

至此，hadoop-eclipse-1.2.1.jar安装完成。