使用Git下载Hadoop的到本地Eclipse开发环境

于 2012-01-30 23:08:14 发布
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分类专栏： Hadoop *n*x MacBook Air 文章标签： hadoop git maven eclipse java
本文记录了在遵循官方指南构建Hadoop Eclipse开发环境时遇到的问题及解决过程。主要问题是由于本地未安装Protocol Buffers导致编译失败，通过安装Protocol Buffers后成功解决了该问题。

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[b][size=x-large]问题场景[/size][/b]
按照官网[url]http://wiki.apache.org/hadoop/EclipseEnvironment[/url]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： 

$ git clone git://git.apache.org/hadoop-common.git
$ mvn install -DskipTests
$ 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： 

[INFO] 
[INFO] --- maven-antrun-plugin:1.6:run (compile-proto) @ hadoop-common ---
[INFO] Executing tasks

main:
     [exec] target/compile-proto.sh: line 17: protoc: command not found
     [exec] target/compile-proto.sh: line 17: protoc: command not found
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Apache Hadoop Main ................................ SUCCESS [2.389s]
[INFO] Apache Hadoop Project POM ......................... SUCCESS [0.698s]
[INFO] Apache Hadoop Annotations ......................... SUCCESS [1.761s]
[INFO] Apache Hadoop Project Dist POM .................... SUCCESS [0.729s]
[INFO] Apache Hadoop Assemblies .......................... SUCCESS [0.353s]
[INFO] Apache Hadoop Auth ................................ SUCCESS [1.998s]
[INFO] Apache Hadoop Auth Examples ....................... SUCCESS [1.227s]
[INFO] Apache Hadoop Common .............................. FAILURE [1.132s]
[INFO] Apache Hadoop Common Project ...................... SKIPPED
[INFO] Apache Hadoop HDFS ................................ SKIPPED
[INFO] Apache Hadoop HttpFS .............................. SKIPPED
[INFO] Apache Hadoop HDFS BookKeeper Journal ............. SKIPPED
[INFO] Apache Hadoop HDFS Project ........................ SKIPPED
[INFO] hadoop-yarn ....................................... SKIPPED
[INFO] hadoop-yarn-api ................................... SKIPPED
[INFO] hadoop-yarn-common ................................ SKIPPED
[INFO] hadoop-yarn-server ................................ SKIPPED
[INFO] hadoop-yarn-server-common ......................... SKIPPED
[INFO] hadoop-yarn-server-nodemanager .................... SKIPPED
[INFO] hadoop-yarn-server-web-proxy ...................... SKIPPED
[INFO] hadoop-yarn-server-resourcemanager ................ SKIPPED
[INFO] hadoop-yarn-server-tests .......................... SKIPPED
[INFO] hadoop-mapreduce-client ........................... SKIPPED
[INFO] hadoop-mapreduce-client-core ...................... SKIPPED
[INFO] hadoop-yarn-applications .......................... SKIPPED
[INFO] hadoop-yarn-applications-distributedshell ......... SKIPPED
[INFO] hadoop-yarn-site .................................. SKIPPED
[INFO] hadoop-mapreduce-client-common .................... SKIPPED
[INFO] hadoop-mapreduce-client-shuffle ................... SKIPPED
[INFO] hadoop-mapreduce-client-app ....................... SKIPPED
[INFO] hadoop-mapreduce-client-hs ........................ SKIPPED
[INFO] hadoop-mapreduce-client-jobclient ................. SKIPPED
[INFO] Apache Hadoop MapReduce Examples .................. SKIPPED
[INFO] hadoop-mapreduce .................................. SKIPPED
[INFO] Apache Hadoop MapReduce Streaming ................. SKIPPED
[INFO] Apache Hadoop Distributed Copy .................... SKIPPED
[INFO] Apache Hadoop Archives ............................ SKIPPED
[INFO] Apache Hadoop Rumen ............................... SKIPPED
[INFO] Apache Hadoop Extras .............................. SKIPPED
[INFO] Apache Hadoop Tools Dist .......................... SKIPPED
[INFO] Apache Hadoop Tools ............................... SKIPPED
[INFO] Apache Hadoop Distribution ........................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12.483s
[INFO] Finished at: Mon Jan 30 22:57:23 GMT+08:00 2012
[INFO] Final Memory: 24M/81M
[INFO] ------------------------------------------------------------------------
[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]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[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。
[b][size=x-large]展开分析[/size][/b]
通过再此使用命令打出错误信息： 
$ mvn install -DskipTests -e

得到详细错误信息为： 

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.387s
[INFO] Finished at: Mon Jan 30 23:11:07 GMT+08:00 2012
[INFO] Final Memory: 19M/81M
[INFO] ------------------------------------------------------------------------
[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]
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
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: An Ant BuildException has occured: exec returned: 127
	at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:283)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: /Users/apple/Documents/Hadoop-common-dev/hadoop-common/hadoop-common-project/hadoop-common/target/antrun/build-main.xml:23: exec returned: 127
	at org.apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:650)
	at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:676)
	at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:502)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
	at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	at org.apache.tools.ant.Task.perform(Task.java:348)
	at org.apache.tools.ant.Target.execute(Target.java:390)
	at org.apache.tools.ant.Target.performTasks(Target.java:411)
	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
	at org.apache.tools.ant.Project.executeTarget(Project.java:1366)
	at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:270)
	... 21 more
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[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[url]https://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException[/url]
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： 

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-antrun-plugin</artifactId>
        <executions>
          <execution>
            <id>compile-proto</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <target>
                <echo file="target/compile-proto.sh">
                    PROTO_DIR=src/main/proto
                    JAVA_DIR=target/generated-sources/java
                    which cygpath 2> /dev/null
                    if [ $? = 1 ]; then
                      IS_WIN=false
                    else
                      IS_WIN=true
                      WIN_PROTO_DIR=`cygpath --windows $PROTO_DIR`
                      WIN_JAVA_DIR=`cygpath --windows $JAVA_DIR`
                    fi
                    mkdir -p $JAVA_DIR 2> /dev/null
                    for PROTO_FILE in `ls $PROTO_DIR/*.proto 2> /dev/null`
                    do
                        if [ "$IS_WIN" = "true" ]; then
                          protoc -I$WIN_PROTO_DIR --java_out=$WIN_JAVA_DIR $PROTO_FILE
                        else
                          protoc -I$PROTO_DIR --java_out=$JAVA_DIR $PROTO_FILE
                        fi
                    done
                </echo>
                <exec executable="sh" dir="${basedir}" failonerror="true">
                  <arg line="target/compile-proto.sh"/>
                </exec>
              </target>
            </configuration>
          </execution>
          <execution>
            <id>compile-test-proto</id>
            <phase>generate-test-sources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <target>
                <echo file="target/compile-test-proto.sh">
                    PROTO_DIR=src/test/proto
                    JAVA_DIR=target/generated-test-sources/java
                    which cygpath 2> /dev/null
                    if [ $? = 1 ]; then
                      IS_WIN=false
                    else
                      IS_WIN=true
                      WIN_PROTO_DIR=`cygpath --windows $PROTO_DIR`
                      WIN_JAVA_DIR=`cygpath --windows $JAVA_DIR`
                    fi
                    mkdir -p $JAVA_DIR 2> /dev/null
                    for PROTO_FILE in `ls $PROTO_DIR/*.proto 2> /dev/null`
                    do
                        if [ "$IS_WIN" = "true" ]; then
                          protoc -I$WIN_PROTO_DIR --java_out=$WIN_JAVA_DIR $PROTO_FILE
                        else
                          protoc -I$PROTO_DIR --java_out=$JAVA_DIR $PROTO_FILE
                        fi
                    done
                </echo>
                <exec executable="sh" dir="${basedir}" failonerror="true">
                  <arg line="target/compile-test-proto.sh"/>
                </exec>
              </target>
            </configuration>
          </execution>
          <execution>
            <id>save-version</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <target>
                <mkdir dir="${project.build.directory}/generated-sources/java"/>
                <exec executable="sh">
                  <arg
                      line="${basedir}/dev-support/saveVersion.sh ${project.version} ${project.build.directory}/generated-sources/java"/>
                </exec>
              </target>
            </configuration>
          </execution>
          <execution>
            <id>generate-test-sources</id>
            <phase>generate-test-sources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <target>

                <mkdir dir="${project.build.directory}/generated-test-sources/java"/>

                <taskdef name="recordcc" classname="org.apache.hadoop.record.compiler.ant.RccTask">
                  <classpath refid="maven.compile.classpath"/>
                </taskdef>
                <recordcc destdir="${project.build.directory}/generated-test-sources/java">
                  <fileset dir="${basedir}/src/test/ddl" includes="**/*.jr"/>
                </recordcc>
              </target>
            </configuration>
          </execution>
          <execution>
            <id>create-log-dir</id>
            <phase>process-test-resources</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <target>
                <!--
                TODO: there are tests (TestLocalFileSystem#testCopy) that fail if data
                TODO: from a previous run is present
                -->
                <delete dir="${test.build.data}"/>
                <mkdir dir="${test.build.data}"/>
                <mkdir dir="${hadoop.log.dir}"/>

                <copy toDir="${project.build.directory}/test-classes">
                  <fileset dir="${basedir}/src/main/conf"/>
                </copy>
              </target>
            </configuration>
          </execution>
          <execution>
            <phase>pre-site</phase>
            <goals>
              <goal>run</goal>
            </goals>
            <configuration>
              <tasks>
                <copy file="src/main/resources/core-default.xml" todir="src/site/resources"/>
                <copy file="src/main/xsl/configuration.xsl" todir="src/site/resources"/>
              </tasks>
            </configuration>
          </execution>
        </executions>
      </plugin>

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

看着让人不解，联系到HowToContribueToHadoop的文章[url]http://wiki.apache.org/hadoop/HowToContribute[/url]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：[quote]Hadoop 0.23+ must have Google's ProtocolBuffers for compilation to work.[/quote]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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