eclipse导入hadoop 2.4

使用以下命令安装Elicpse插件hadoop-maven-plugins：
$ cd ${HADOOP_HOME}/hadoop-maven-plugins
$ mvn install
然后生成Eclipse工程文件：
$ cd ${HADOOP_HOME}
$ mvn eclipse:eclipse -DskipTests
最后在Eclipse中按照以下流程导入源代码：“File” → “Import”→ “Existing Projects into Workspace”。

这里可以参考:http://www.aboutyun.com/thread-8211-1-1.html

下面是某个博客写的错误，其中我只遇到了几个，我在最后贴出我遇到的错误

Error#1. hadoop-streaming里面的build path有问题，显示/root/workspace/hadoop-2.2.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/conf(missing)

解决办法，remove掉引用就好。

Error#2. hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientFailover.java中报sun.net.spi.nameservice.NameService错误，这是一个需要import的包，存在于openjdk中，在Oracle Jdk中没找到，需要下载一个。NameService是一个接口，在网上找一个NameService放到该包中就好。http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7u40-b43/sun/net/spi/nameservice/NameService.java#NameService

Error#3. /hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/XmlEditsVisitor.java里面显示 
import com.sun.org.apache.xml.internal.serialize.OutputFormat; 
import com.sun.org.apache.xml.internal.serialize.XMLSerializer; 
失败，这是由于Eclipse的强检查原则，打开Java -> Compiler -> Errors/Warnings and under "Deprecated and restricted API" change the setting of "Forbidden reference (access rules)" 将error级别调整到warning级别就好。

Error#4. /hadoop-common/src/test/java/org/apache/hadoop/io/serializer/avro/TestAvroSerialization.java显示没有AvroRecord类，在网上搜索到AvroRecord类放入到同级包中就行了。  http://grepcode.com/file/repo1.maven.org/maven2/org.apache.hadoop/hadoop-common/2.2.0/org/apache/hadoop/io/serializer/avro/AvroRecord.java#AvroRecord

Error#5. org.apache.hadoop.ipc.protobuf包是空的，需要在/hadoop-common/target/generated-sources/java中找到profobuf拷贝到/hadoop-common/src/test/java中就好了. 同时包里面还缺少了以下三个引用，在GrepCode上找一下，把hadoop-common2.2.0的相应文件下下来导入。

org.apache.hadoop.ipc.protobuf.TestProtos.EchoRequestProto;
org.apache.hadoop.ipc.protobuf.TestProtos.EchoResponseProto;
org.apache.hadoop.ipc.protobuf.TestRpcServiceProtos.TestProtobufRpcProto;

Error#6. /hadoop-auth/org/apache/hadoop/security/authentication/client/AuthenricatorTestCase.java中显示server.start()和server.stop()错误，还没找到原因所在，待检查~~~

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我遇到的错误提示56个，其实主要就3个问题

1. 同上Error#1. hadoop-streaming里面的build path有问题，显示/root/workspace/hadoop-2.2.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/conf(missing)

   解决办法，remove掉引用就好，具体右键右边出错项目->properties->左边Java Build Path->Source->选定错误项->右边Remove

2. 同上Error#4，解决方法同上

3. 同上Error#5，解决方法同上

然后应该就没错了

参考：

http://zhidao.baidu.com/link?url=HC-qIB_XxZ4ZdJtD-gPGI0mmWgE7fGpJC222Ri9hA-ju3iflCEr4IVt7ZogVOU7jYR4Fwew8YUp0opwo_9tdLZ4U-VD5DErkQn8OIhzZQfW

eclipse导入hadoop 2.4,古老的榕树,5-wow.com