Hadoop2.4.0 Eclipse外掛製作

Mr_Chenph發表於2014-04-16
HadoopEclipse

        跌跌撞撞兩天裝Hadoop2.4.0的環境，今天終於可以嘗試寫點程式了，想了一想，不得其法，但有一點是肯定的，那就是需要用eclipse，查了一上午的資料，怎麼講的都有，最後鎖定了這個帖子，hadoop2x-eclipse-plugin。想用Github下載，但是最後下載失敗，頁面右側有個Download ZIP，用這個下載成功。下邊來說說我的整個製作過程吧：

  • 想匯入到eclipse中製作，但是匯入進去之後覺得麻煩就算了，直接在win7 64位、JDK1.6、ANT1.8的環境下以命令列執行
  • 依葫蘆畫瓢，設定eclipse的目錄和hadoop的目錄，在沒有修改任何檔案的情況下直接執行
D:\SDK\hadoop2x-eclipse-plugin-master\src\contrib\eclipse-plugin>ant jar -Dversion=2.4.0 -Declipse.home=D:\WorkTools\MyEclipse10\Common -Dhadoop.home=D:\SDK\hadoop-2.4.0
  • 在ivy-resolve-common處卡了大概138分鐘，最後build失敗，檢視原因有兩個，一個是找不到4個依賴包，一個是找不到1個核心包
  • 依賴包分別是這些，可能是換路徑了吧：
https://oss.sonatype.org/content/groups/public/com/google/google/1/google-1.jar
https://oss.sonatype.org/content/groups/public/net/java/jvnet-parent/1/jvnet-parent-1.jar
https://oss.sonatype.org/content/groups/public/com/sun/jersey/contribs/jersey-contribs/1.9/jersey-contribs-1.9.jar
https://oss.sonatype.org/content/groups/public/org/eclipse/jetty/jetty-parent/14/jetty-parent-14.jar
  • 核心包是commons-lang-2.5.jar
  • 想了一下，覺得那四個依賴包似乎沒什麼用，便想跳過那個步驟，想直接進行編譯外掛的步驟，便修改了“hadoop2x-eclipse-plugin-master\src\contrib\eclipse-plugin\build.xml”檔案
<target name="compile" depends="init, ivy-retrieve-common" unless="skip.contrib">     去掉depends
  • 核心包去hadoop2.4目錄找，發現hadoop2.4用的commons-lang-2.6.jar，便在build.xml中找到相應位置改為2.6，這個需要說的是作者可能偷懶，在拷貝檔案中使用的是變數，在配置資訊中直接使用了2.5，不統一，變數配置資訊在“hadoop2x-eclipse-plugin-master\ivy\libraries.properties”檔案中，搜尋“commons-lang.version”將對應的版本改為2.6，好了，在命令列下執行ant，成功在“hadoop2x-eclipse-plugin-master\build\contrib\eclipse-plugin”下生成外掛
  • 興奮的拿著外掛跟myeclipse10裡試，失敗（外掛壓根不出現），跟eclipse3.7裡試，失敗（外掛能出現，但是無法正常使用，新增不了location）
  • 拿著現成的2.2的外掛均可以正常使用
  • 後來經過排查原因myeclipse10裡是因為外掛放的位置不對，不能直接放到plugin裡；eclipse3.7裡失敗是因為外掛還缺少包
  • 如何排查的呢？看eclipse的啟動日誌，這個日誌在workplace中的.metadata檔案下的.log檔案，在eclipse3.7裡報的錯誤是無法初始化hadoop，很鬱悶，沒太大幫助，於是就上eclilpse的官網下載了最新版的eclipse4.3.2，將ant語句改為
D:\SDK\hadoop2x-eclipse-plugin-master\src\contrib\eclipse-plugin>ant jar -Dversion=2.4.0 -Declipse.home=D:\WorkTools\eclipse4.3.2 -Dhadoop.home=D:\SDK\hadoop-2.4.0
  • 對，改為以eclipse4.3.2為eclipse目錄(這個配置主要就是為生成eclipse外掛提供jar包支援)，生成外掛後放到eclipse4.3.2的plugins裡，啟動eclipse並觀察日誌，丟擲異常
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/UnmodifiableMap
  • yes~ 折騰了又兩個多小時，終於讓我抓住了，找到這個包，在build.xml中新增上，別忘了在配置資訊中也要新增，就是檔案最下邊的attribute，如果想以後方便，版本號也可以通過變數形式在libraries.properties中維護，搞定後，重新執行ant
  • 終於行了，在myeclipse10下也可正常使用了（這麼建立資料夾MyEclipse 10\dropins\hadoop\eclipse\plugins，把外掛扔這個資料夾下邊就行了）
------------------------------------------------最終的build.xml檔案，修改的地方有註釋---------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project default="jar" name="eclipse-plugin">
  <import file="../build-contrib.xml"/>
  <path id="eclipse-sdk-jars">
    <fileset dir="${eclipse.home}/plugins/">
      <include name="org.eclipse.ui*.jar"/>
      <include name="org.eclipse.jdt*.jar"/>
      <include name="org.eclipse.core*.jar"/>
      <include name="org.eclipse.equinox*.jar"/>
      <include name="org.eclipse.debug*.jar"/>
      <include name="org.eclipse.osgi*.jar"/>
      <include name="org.eclipse.swt*.jar"/>
      <include name="org.eclipse.jface*.jar"/>
      <include name="org.eclipse.team.cvs.ssh2*.jar"/>
      <include name="com.jcraft.jsch*.jar"/>
    </fileset> 
  </path>
  <path id="hadoop-sdk-jars">
    <fileset dir="${hadoop.home}/share/hadoop/mapreduce">
      <include name="hadoop*.jar"/>
    </fileset> 
    <fileset dir="${hadoop.home}/share/hadoop/hdfs">
      <include name="hadoop*.jar"/>
    </fileset> 
    <fileset dir="${hadoop.home}/share/hadoop/common">
      <include name="hadoop*.jar"/>
    </fileset> 
  </path>
  <path id="classpath">
    <pathelement location="${build.classes}"/>
    <path refid="eclipse-sdk-jars"/>
    <path refid="hadoop-sdk-jars"/>
  </path>
  <target name="check-contrib" unless="eclipse.home">
    <property name="skip.contrib" value="yes"/>
    <echo message="eclipse.home unset: skipping eclipse plugin"/>
  </target>
	<!-- 這裡我最後刪除了depends="init, ivy-retrieve-common" -->
 <target name="compile" depends="init, ivy-retrieve-common" unless="skip.contrib">
    <echo message="contrib: ${name}"/>
    <javac
     encoding="${build.encoding}"
     srcdir="${src.dir}"
     includes="**/*.java"
     destdir="${build.classes}"
     debug="${javac.debug}"
     deprecation="${javac.deprecation}">
     <classpath refid="classpath"/>
    </javac>
  </target>
  <target name="jar" depends="compile" unless="skip.contrib">
    <mkdir dir="${build.dir}/lib"/>
    <copy  todir="${build.dir}/lib/" verbose="true">
          <fileset dir="${hadoop.home}/share/hadoop/mapreduce">
           <include name="hadoop*.jar"/>
          </fileset>
    </copy>
    <copy  todir="${build.dir}/lib/" verbose="true">
          <fileset dir="${hadoop.home}/share/hadoop/common">
           <include name="hadoop*.jar"/>
          </fileset>
    </copy>
    <copy  todir="${build.dir}/lib/" verbose="true">
          <fileset dir="${hadoop.home}/share/hadoop/hdfs">
           <include name="hadoop*.jar"/>
          </fileset>
    </copy>
    <copy  todir="${build.dir}/lib/" verbose="true">
          <fileset dir="${hadoop.home}/share/hadoop/yarn">
           <include name="hadoop*.jar"/>
          </fileset>
    </copy>

    <copy  todir="${build.dir}/classes" verbose="true">
          <fileset dir="${root}/src/java">
           <include name="*.xml"/>
          </fileset>
    </copy>
    <copy file="${hadoop.home}/share/hadoop/common/lib/protobuf-java-${protobuf.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/log4j-${log4j.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/commons-configuration-${commons-configuration.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/commons-lang-${commons-lang.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <!-- 下邊這行是新增的，原來沒有 -->
    <copy file="${hadoop.home}/share/hadoop/common/lib/commons-collections-${commons-collections.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/jackson-core-asl-${jackson.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/jackson-mapper-asl-${jackson.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/slf4j-log4j12-${slf4j-log4j12.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/slf4j-api-${slf4j-api.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/guava-${guava.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/hadoop-auth-${hadoop.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <copy file="${hadoop.home}/share/hadoop/common/lib/netty-${netty.version}.jar"  todir="${build.dir}/lib" verbose="true"/>
    <jar
      jarfile="${build.dir}/hadoop-${name}-${version}.jar"
      manifest="${root}/META-INF/MANIFEST.MF">
      <manifest>
	 <attribute name="Bundle-ClassPath" 
		value="classes/, 
 lib/hadoop-mapreduce-client-core-${hadoop.version}.jar,
 lib/hadoop-mapreduce-client-common-${hadoop.version}.jar,
 lib/hadoop-mapreduce-client-jobclient-${hadoop.version}.jar,
 lib/hadoop-auth-${hadoop.version}.jar,
 lib/hadoop-common-${hadoop.version}.jar,
 lib/hadoop-hdfs-${hadoop.version}.jar,
 lib/protobuf-java-${protobuf.version}.jar,
 lib/log4j-${log4j.version}.jar,
 lib/commons-cli-1.2.jar,
 lib/commons-configuration-1.6.jar,
 lib/commons-httpclient-3.1.jar,
 <!-- 下邊這行原來寫的是commons-lang-2.5 -->
 lib/commons-lang-${commons-lang.version}.jar,
 <!-- 下邊這行是新增的，原來沒有 -->
 lib/commons-collections-${commons-collections.version}.jar,
 lib/jackson-core-asl-1.8.8.jar,
 lib/jackson-mapper-asl-1.8.8.jar,
 lib/slf4j-log4j12-1.7.5.jar,
 lib/slf4j-api-1.7.5.jar,
 lib/guava-${guava.version}.jar,
 lib/netty-${netty.version}.jar"/>
	 </manifest>
      <fileset dir="${build.dir}" includes="classes/ lib/"/>
      <fileset dir="${root}" includes="resources/ plugin.xml"/>
    </jar>
  </target>
</project>






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