Eclipse导入Hadoop 源码

1.准备工作
 
    jdk：
    eclipse：
    Maven：
    libprotoc ：https://developers.google.com/protocol-buffers/
    hadoop:http://www.apache.org/dyn/closer.cgi/hadoop/common/
 
添加开源中国maven库：http://maven.oschina.net/home.html
maven\conf\settings.xml
<localRepository>path</localRepository>
<mirrors>
    <mirror>
        <id>nexus-osc</id>
        <mirrorOf>*</mirrorOf>
        <name>Nexus osc</name>
        <url>http://maven.oschina.net/content/groups/public/</url>
    </mirror>
</mirrors>
 
2.导入
    将hadoop源码解压到一个目录，注意目录层次不要太深，否则可能无法解压。
    进入hadoop-maven-plugins文件夹，执行 mvn install
    返回源码根目录，执行 mvn eclipse:eclipse –DskipTests
    eclipse在任意目录创建新的WorkSpace
    eclipse设置Maven：window->preference->maven->{Installations...;user Settings：maven\conf\settings.xml}
eclipse：File->inport->Existing Projects into WorkSpace->Hadoop源码根目录
 
3.错误处理

1. maven下载pom失败->重新操作

2. hadoop-streaming中build path错误->Java Build Path->Source:

   1. 删除...hadoop-yarn-server-resourcemanager/conf

   2. Link Source:源码根目录/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop- yarn-server-resourcemanager/conf，再随便起个名字；inclusion patterns：capacity-scheduler.xml；exclusion patters：**/*.java

3. org.apache.hadoop.io.serializer.avro.TestAvroSerialization

4. 下载avro-tools-1.7.4.jar：http://archive.apache.org/dist/avro/avro-1.7.4/java/

5. 进入目录：源码根目录\hadoop-common-project\hadoop-common\src\test\avro

6. java -jar path/to/avro-tools-1.7.4.jar compile schema avroRecord.avsc ..\java

7. eclipse 刷新

8. 进入目录：源码根目录\hadoop-common-project\hadoop-common\src\test\proto

9. protoc --java_out=../java *.proto

10. eclipse 刷新

11. org.apache.hadoop.ipc.protobuf.TestProtos

12. project->clean..->clean all projects & Build the entire workspace