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技术 2022年11月23日
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使用Git下载Hadoop的到本地Eclipse开发环境

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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:

  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:

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

  1. $ mvn install -DskipTests -e

得到详细错误信息为:

  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:

  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} ${project.build.directory}/generated-sources/java”/>
  87. </exec>
  88. </target>
  89. </configuration>
  90. </execution>
  91. <execution>
  92. <id>generate-test-sources</id>
  93. <phase>generate-test-sources</phase>
  94. <goals>
  95. <goal>run</goal>
  96. </goals>
  97. <configuration>
  98. <target>
  99. <mkdir dir=”${project.build.directory}/generated-test-sources/java”/>
  100. <taskdef name=”recordcc” classname=”org.apache.hadoop.record.compiler.ant.RccTask”>
  101. <classpath refid=”maven.compile.classpath”/>
  102. </taskdef>
  103. <recordcc destdir=”${project.build.directory}/generated-test-sources/java”>
  104. <fileset dir=”${basedir}/src/test/ddl” includes=”**/*.jr”/>
  105. </recordcc>
  106. </target>
  107. </configuration>
  108. </execution>
  109. <execution>
  110. <id>create-log-dir</id>
  111. <phase>process-test-resources</phase>
  112. <goals>
  113. <goal>run</goal>
  114. </goals>
  115. <configuration>
  116. <target>
  117. <!–
  118. TODO: there are tests (TestLocalFileSystem#testCopy) that fail if data
  119. TODO: from a previous run is present
  120. –>
  121. <delete dir=”${test.build.data}”/>
  122. <mkdir dir=”${test.build.data}”/>
  123. <mkdir dir=”${hadoop.log.dir}”/>
  124. <copy toDir=”${project.build.directory}/test-classes”>
  125. <fileset dir=”${basedir}/src/main/conf”/>
  126. </copy>
  127. </target>
  128. </configuration>
  129. </execution>
  130. <execution>
  131. <phase>pre-site</phase>
  132. <goals>
  133. <goal>run</goal>
  134. </goals>
  135. <configuration>
  136. <tasks>
  137. <copy file=”src/main/resources/core-default.xml” todir=”src/site/resources”/>
  138. <copy file=”src/main/xsl/configuration.xsl” todir=”src/site/resources”/>
  139. </tasks>
  140. </configuration>
  141. </execution>
  142. </executions>
  143. </plugin>

上面是在Pom.xml文件中使用Maven下使用Ant插件,里面有一行:

  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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