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
path
nexus-osc
*
Nexus osc
http://maven.oschina.net/content/groups/public/
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
[*] maven下载pom失败->重新操作
[*] hadoop-streaming中build path错误->Java Build Path->Source:
[*] 删除...hadoop-yarn-server-resourcemanager/conf
[*] 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
[*] org.apache.hadoop.io.serializer.avro.TestAvroSerialization
[*] 下载avro-tools-1.7.4.jar：http://archive.apache.org/dist/avro/avro-1.7.4/java/
[*] 进入目录：源码根目录\hadoop-common-project\hadoop-common\src\test\avro
[*] java -jar path/to/avro-tools-1.7.4.jar compile schema avroRecord.avsc ..\java
[*] eclipse 刷新
[*] 进入目录：源码根目录\hadoop-common-project\hadoop-common\src\test\proto
[*] protoc --java_out=../java *.proto
[*] eclipse 刷新
[*] org.apache.hadoop.ipc.protobuf.TestProtos
[*] project->clean..->clean all projects & Build the entire workspace
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