使用Git下载Hadoop的到本地Eclipse开发环境

使用Git下载Hadoop的到本地Eclipse开发环境

博客分类：
hadoopgitmaveneclipsejava 
问题场景 
按照官网http://wiki.apache.org/hadoop/EclipseEnvironment指导，要把Hadoop下载到本地，并构建Eclipse开发环境，只需要三条指令： 
Java代码  收藏代码
  1. $ git clone git://git.apache.org/hadoop-common.git  
  2. $ mvn install -DskipTests  
  3. $ mvn eclipse:eclipse -DdownloadSources=true -DdownloadJavadocs=true  

即可，但当我在本地执行完第二条后，报出如下错误日志信息： 
Java代码  收藏代码
  1. [INFO]   
  2. [INFO] --- maven-antrun-plugin:1.6:run (compile-proto) @ hadoop-common ---  
  3. [INFO] Executing tasks  
  4.   
  5. main:  
  6.      [exec] target/compile-proto.sh: line 17: protoc: command not found  
  7.      [exec] target/compile-proto.sh: line 17: protoc: command not found  
  8. [INFO] ------------------------------------------------------------------------  
  9. [INFO] Reactor Summary:  
  10. [INFO]   
  11. [INFO] Apache Hadoop Main ................................ SUCCESS [2.389s]  
  12. [INFO] Apache Hadoop Project POM ......................... SUCCESS [0.698s]  
  13. [INFO] Apache Hadoop Annotations ......................... SUCCESS [1.761s]  
  14. [INFO] Apache Hadoop Project Dist POM .................... SUCCESS [0.729s]  
  15. [INFO] Apache Hadoop Assemblies .......................... SUCCESS [0.353s]  
  16. [INFO] Apache Hadoop Auth ................................ SUCCESS [1.998s]  
  17. [INFO] Apache Hadoop Auth Examples ....................... SUCCESS [1.227s]  
  18. [INFO] Apache Hadoop Common .............................. FAILURE [1.132s]  
  19. [INFO] Apache Hadoop Common Project ...................... SKIPPED  
  20. [INFO] Apache Hadoop HDFS ................................ SKIPPED  
  21. [INFO] Apache Hadoop HttpFS .............................. SKIPPED  
  22. [INFO] Apache Hadoop HDFS BookKeeper Journal ............. SKIPPED  
  23. [INFO] Apache Hadoop HDFS Project ........................ SKIPPED  
  24. [INFO] hadoop-yarn ....................................... SKIPPED  
  25. [INFO] hadoop-yarn-api ................................... SKIPPED  
  26. [INFO] hadoop-yarn-common ................................ SKIPPED  
  27. [INFO] hadoop-yarn-server ................................ SKIPPED  
  28. [INFO] hadoop-yarn-server-common ......................... SKIPPED  
  29. [INFO] hadoop-yarn-server-nodemanager .................... SKIPPED  
  30. [INFO] hadoop-yarn-server-web-proxy ...................... SKIPPED  
  31. [INFO] hadoop-yarn-server-resourcemanager ................ SKIPPED  
  32. [INFO] hadoop-yarn-server-tests .......................... SKIPPED  
  33. [INFO] hadoop-mapreduce-client ........................... SKIPPED  
  34. [INFO] hadoop-mapreduce-client-core ...................... SKIPPED  
  35. [INFO] hadoop-yarn-applications .......................... SKIPPED  
  36. [INFO] hadoop-yarn-applications-distributedshell ......... SKIPPED  
  37. [INFO] hadoop-yarn-site .................................. SKIPPED  
  38. [INFO] hadoop-mapreduce-client-common .................... SKIPPED  
  39. [INFO] hadoop-mapreduce-client-shuffle ................... SKIPPED  
  40. [INFO] hadoop-mapreduce-client-app ....................... SKIPPED  
  41. [INFO] hadoop-mapreduce-client-hs ........................ SKIPPED  
  42. [INFO] hadoop-mapreduce-client-jobclient ................. SKIPPED  
  43. [INFO] Apache Hadoop MapReduce Examples .................. SKIPPED  
  44. [INFO] hadoop-mapreduce .................................. SKIPPED  
  45. [INFO] Apache Hadoop MapReduce Streaming ................. SKIPPED  
  46. [INFO] Apache Hadoop Distributed Copy .................... SKIPPED  
  47. [INFO] Apache Hadoop Archives ............................ SKIPPED  
  48. [INFO] Apache Hadoop Rumen ............................... SKIPPED  
  49. [INFO] Apache Hadoop Extras .............................. SKIPPED  
  50. [INFO] Apache Hadoop Tools Dist .......................... SKIPPED  
  51. [INFO] Apache Hadoop Tools ............................... SKIPPED  
  52. [INFO] Apache Hadoop Distribution ........................ SKIPPED  
  53. [INFO] ------------------------------------------------------------------------  
  54. [INFO] BUILD FAILURE  
  55. [INFO] ------------------------------------------------------------------------  
  56. [INFO] Total time: 12.483s  
  57. [INFO] Finished at: Mon Jan 30 22:57:23 GMT+08:00 2012  
  58. [INFO] Final Memory: 24M/81M  
  59. [INFO] ------------------------------------------------------------------------  
  60. [ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.6:run (compile-proto) on project hadoop-common: An Ant BuildException has occured: exec returned: 127 -> [Help 1]  
  61. [ERROR]   
  62. [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.  
  63. [ERROR] Re-run Maven using the -X switch to enable full debug logging.  
  64. [ERROR]   
  65. [ERROR] For more information about the errors and possible solutions, please read the following articles:  
  66. [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException  
  67. [ERROR]   
  68. [ERROR] After correcting the problems, you can resume the build with the command  
  69. [ERROR]   mvn <goals> -rf :hadoop-common  


此问题我暂时还未分析具体原因和解决方案，暂时记录下。 
展开分析 
通过再此使用命令打出错误信息： 
Java代码  收藏代码
  1. $ mvn install -DskipTests -e  

得到详细错误信息为： 
Java代码  收藏代码
  1. [INFO] ------------------------------------------------------------------------  
  2. [INFO] BUILD FAILURE  
  3. [INFO] ------------------------------------------------------------------------  
  4. [INFO] Total time: 9.387s  
  5. [INFO] Finished at: Mon Jan 30 23:11:07 GMT+08:00 2012  
  6. [INFO] Final Memory: 19M/81M  
  7. [INFO] ------------------------------------------------------------------------  
  8. [ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.6:run (compile-proto) on project hadoop-common: An Ant BuildException has occured: exec returned: 127 -> [Help 1]  
  9. org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.6:run (compile-proto) on project hadoop-common: An Ant BuildException has occured: exec returned: 127  
  10.     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)  
  11.     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)  
  12.     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)  
  13.     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)  
  14.     at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)  
  15.     at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)  
  16.     at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)  
  17.     at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)  
  18.     at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)  
  19.     at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)  
  20.     at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)  
  21.     at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)  
  22.     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
  23.     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)  
  24.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)  
  25.     at java.lang.reflect.Method.invoke(Method.java:597)  
  26.     at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)  
  27.     at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)  
  28.     at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)  
  29.     at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)  
  30. Caused by: org.apache.maven.plugin.MojoExecutionException: An Ant BuildException has occured: exec returned: 127  
  31.     at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:283)  
  32.     at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)  
  33.     at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)  
  34.     ... 19 more  
  35. Caused by: /Users/apple/Documents/Hadoop-common-dev/hadoop-common/hadoop-common-project/hadoop-common/target/antrun/build-main.xml:23: exec returned: 127  
  36.     at org.apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:650)  
  37.     at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:676)  
  38.     at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:502)  
  39.     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)  
  40.     at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)  
  41.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)  
  42.     at java.lang.reflect.Method.invoke(Method.java:597)  
  43.     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)  
  44.     at org.apache.tools.ant.Task.perform(Task.java:348)  
  45.     at org.apache.tools.ant.Target.execute(Target.java:390)  
  46.     at org.apache.tools.ant.Target.performTasks(Target.java:411)  
  47.     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)  
  48.     at org.apache.tools.ant.Project.executeTarget(Project.java:1366)  
  49.     at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:270)  
  50.     ... 21 more  
  51. [ERROR]   
  52. [ERROR] Re-run Maven using the -X switch to enable full debug logging.  
  53. [ERROR]   
  54. [ERROR] For more information about the errors and possible solutions, please read the following articles:  
  55. [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException  
  56. [ERROR]   

通过上面错误信息，真方便找到解决方案。 

根据上面的提示，访问https://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException 
得到如下提示信息： 
        Unlike many other errors, this exception is not generated by the Maven core itself but by a plugin. As a rule of thumb, plugins use this error to signal a problem in their configuration or the information they retrieved from the POM. 
        这里说的意思是： 
        这个错误不是Maven本身的错误，根据经验，可能是Maven使用的插件通过这个异常来标识它们没有从POM中获得相关的配置信息。 

接下来进一步分析，通过Maven构建Hadoop过程中是否使用了插件。 
        从错误日志分析，编译过程使用了插件：maven-antrun-plugin。由于编译Hadoop-common过程中出错，所以进一步定位到hadoop-common工程下的POM.xml，可到看到下面信息： 
Xml代码  收藏代码
  1. <plugin>  
  2.         <groupId>org.apache.maven.plugins</groupId>  
  3.         <artifactId>maven-antrun-plugin</artifactId>  
  4.         <executions>  
  5.           <execution>  
  6.             <id>compile-proto</id>  
  7.             <phase>generate-sources</phase>  
  8.             <goals>  
  9.               <goal>run</goal>  
  10.             </goals>  
  11.             <configuration>  
  12.               <target>  
  13.                 <echo file="target/compile-proto.sh">  
  14.                     PROTO_DIR=src/main/proto  
  15.                     JAVA_DIR=target/generated-sources/java  
  16.                     which cygpath 2> /dev/null  
  17.                     if [ $? = 1 ]; then  
  18.                       IS_WIN=false  
  19.                     else  
  20.                       IS_WIN=true  
  21.                       WIN_PROTO_DIR=`cygpath --windows $PROTO_DIR`  
  22.                       WIN_JAVA_DIR=`cygpath --windows $JAVA_DIR`  
  23.                     fi  
  24.                     mkdir -p $JAVA_DIR 2> /dev/null  
  25.                     for PROTO_FILE in `ls $PROTO_DIR/*.proto 2> /dev/null`  
  26.                     do  
  27.                         if [ "$IS_WIN" = "true" ]; then  
  28.                           protoc -I$WIN_PROTO_DIR --java_out=$WIN_JAVA_DIR $PROTO_FILE  
  29.                         else  
  30.                           protoc -I$PROTO_DIR --java_out=$JAVA_DIR $PROTO_FILE  
  31.                         fi  
  32.                     done  
  33.                 </echo>  
  34.                 <exec executable="sh" dir="${basedir}" failonerror="true">  
  35.                   <arg line="target/compile-proto.sh"/>  
  36.                 </exec>  
  37.               </target>  
  38.             </configuration>  
  39.           </execution>  
  40.           <execution>  
  41.             <id>compile-test-proto</id>  
  42.             <phase>generate-test-sources</phase>  
  43.             <goals>  
  44.               <goal>run</goal>  
  45.             </goals>  
  46.             <configuration>  
  47.               <target>  
  48.                 <echo file="target/compile-test-proto.sh">  
  49.                     PROTO_DIR=src/test/proto  
  50.                     JAVA_DIR=target/generated-test-sources/java  
  51.                     which cygpath 2> /dev/null  
  52.                     if [ $? = 1 ]; then  
  53.                       IS_WIN=false  
  54.                     else  
  55.                       IS_WIN=true  
  56.                       WIN_PROTO_DIR=`cygpath --windows $PROTO_DIR`  
  57.                       WIN_JAVA_DIR=`cygpath --windows $JAVA_DIR`  
  58.                     fi  
  59.                     mkdir -p $JAVA_DIR 2> /dev/null  
  60.                     for PROTO_FILE in `ls $PROTO_DIR/*.proto 2> /dev/null`  
  61.                     do  
  62.                         if [ "$IS_WIN" = "true" ]; then  
  63.                           protoc -I$WIN_PROTO_DIR --java_out=$WIN_JAVA_DIR $PROTO_FILE  
  64.                         else  
  65.                           protoc -I$PROTO_DIR --java_out=$JAVA_DIR $PROTO_FILE  
  66.                         fi  
  67.                     done  
  68.                 </echo>  
  69.                 <exec executable="sh" dir="${basedir}" failonerror="true">  
  70.                   <arg line="target/compile-test-proto.sh"/>  
  71.                 </exec>  
  72.               </target>  
  73.             </configuration>  
  74.           </execution>  
  75.           <execution>  
  76.             <id>save-version</id>  
  77.             <phase>generate-sources</phase>  
  78.             <goals>  
  79.               <goal>run</goal>  
  80.             </goals>  
  81.             <configuration>  
  82.               <target>  
  83.                 <mkdir dir="${project.build.directory}/generated-sources/java"/>  
  84.                 <exec executable="sh">  
  85.                   <arg  
  86.                       line="${basedir}/dev-support/saveVersion.sh ${project.version} ${project.build.directory}/generated-sources/java"/>  
  87.                 </exec>  
  88.               </target>  
  89.             </configuration>  
  90.           </execution>  
  91.           <execution>  
  92.             <id>generate-test-sources</id>  
  93.             <phase>generate-test-sources</phase>  
  94.             <goals>  
  95.               <goal>run</goal>  
  96.             </goals>  
  97.             <configuration>  
  98.               <target>  
  99.   
  100.                 <mkdir dir="${project.build.directory}/generated-test-sources/java"/>  
  101.   
  102.                 <taskdef name="recordcc" classname="org.apache.hadoop.record.compiler.ant.RccTask">  
  103.                   <classpath refid="maven.compile.classpath"/>  
  104.                 </taskdef>  
  105.                 <recordcc destdir="${project.build.directory}/generated-test-sources/java">  
  106.                   <fileset dir="${basedir}/src/test/ddl" includes="**/*.jr"/>  
  107.                 </recordcc>  
  108.               </target>  
  109.             </configuration>  
  110.           </execution>  
  111.           <execution>  
  112.             <id>create-log-dir</id>  
  113.             <phase>process-test-resources</phase>  
  114.             <goals>  
  115.               <goal>run</goal>  
  116.             </goals>  
  117.             <configuration>  
  118.               <target>  
  119.                 <!--  
  120.                 TODO: there are tests (TestLocalFileSystem#testCopy) that fail if data  
  121.                 TODO: from a previous run is present  
  122.                 -->  
  123.                 <delete dir="${test.build.data}"/>  
  124.                 <mkdir dir="${test.build.data}"/>  
  125.                 <mkdir dir="${hadoop.log.dir}"/>  
  126.   
  127.                 <copy toDir="${project.build.directory}/test-classes">  
  128.                   <fileset dir="${basedir}/src/main/conf"/>  
  129.                 </copy>  
  130.               </target>  
  131.             </configuration>  
  132.           </execution>  
  133.           <execution>  
  134.             <phase>pre-site</phase>  
  135.             <goals>  
  136.               <goal>run</goal>  
  137.             </goals>  
  138.             <configuration>  
  139.               <tasks>  
  140.                 <copy file="src/main/resources/core-default.xml" todir="src/site/resources"/>  
  141.                 <copy file="src/main/xsl/configuration.xsl" todir="src/site/resources"/>  
  142.               </tasks>  
  143.             </configuration>  
  144.           </execution>  
  145.         </executions>  
  146.       </plugin>  

上面是在Pom.xml文件中使用Maven下使用Ant插件，里面有一行： 
Xml代码  收藏代码
  1. <echo file="target/compile-proto.sh">  

看着让人不解，联系到HowToContribueToHadoop的文章http://wiki.apache.org/hadoop/HowToContribute可以推知，有可能由于本地没有安装ProtocolBuffers引起的，因为文章内部特别说明了：
引用
Hadoop 0.23+ must have Google's ProtocolBuffers for compilation to work.
接下来打算在本地重新安装ProtocolBuffers后再编译部署。 


如预期，在本地安装好了Protoc Buffer后，后面两条指令顺利执行完整，剩下的就依据官网把目录下的工程导入Eclipse后，就可以在Eclipse下学习调试源码。
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原文地址：https://www.cnblogs.com/adolfmc/p/3280307.html