Hadoop学习之编译eclipse插件

   最近准备开始学习Hadoop1.2.1的源代码，感觉最好的方法还是可以在运行Hadoop及hadoop作业时跟踪调试代码的实际执行情况。由于选择的IDE为eclipse，所以准备编译一下hadoop的eclipse插件，下面就直接进入正题。Hadoop的eclipse插件源代码位于hadoop-1.2.1/src/contrib/eclipse-plugin/中，直接进入该目录，在不做任何修改的情况下，在命令行输入ant，执行效果如下：

[hadoop@hadoop eclipse-plugin]$ antBuildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xmlcheck-contrib:     [echo] eclipse.home unset: skipping eclipse plugininit:ivy-download:      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar      [get] Not modified - so not downloadedivy-probe-antlib:ivy-init-antlib:ivy-init:[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlivy-resolve-common:[ivy:resolve] [ivy:resolve] :: problems summary ::[ivy:resolve] :::: WARNINGS[ivy:resolve] module not found: commons-logging#commons-logging;1.0.4[ivy:resolve] ==== local: tried[ivy:resolve]   /home/hadoop/.ivy2/local/commons-logging/commons-logging/1.0.4/ivys/ivy.xml[ivy:resolve]   -- artifact commons-logging#commons-logging;1.0.4!commons-logging.jar:[ivy:resolve]   /home/hadoop/.ivy2/local/commons-logging/commons-logging/1.0.4/jars/commons-logging.jar[ivy:resolve] ==== maven2: tried[ivy:resolve]   http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom[ivy:resolve]   -- artifact commons-logging#commons-logging;1.0.4!commons-logging.jar:[ivy:resolve]   http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar[ivy:resolve] ==== oss-sonatype: tried[ivy:resolve]   https://oss.sonatype.org/content/groups/public/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom[ivy:resolve]   -- artifact commons-logging#commons-logging;1.0.4!commons-logging.jar:[ivy:resolve]   https://oss.sonatype.org/content/groups/public/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::[ivy:resolve] ::          UNRESOLVED DEPENDENCIES         ::[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::[ivy:resolve] :: commons-logging#commons-logging;1.0.4: not found[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::[ivy:resolve] :::: ERRORS[ivy:resolve] SERVER ERROR: Gateway Timeout url=http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom[ivy:resolve] SERVER ERROR: Gateway Timeout url=http://repo1.maven.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar[ivy:resolve] SERVER ERROR: Gateway Timeout url=http://repo1.maven.org/maven2/log4j/log4j/1.2.15/log4j-1.2.15.jar[ivy:resolve] [ivy:resolve] :: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILSBUILD FAILED/home/hadoop/hadoop-1.2.1/src/contrib/build-contrib.xml:492: impossible to resolve dependencies:resolve failed - see output for detailsTotal time: 2 minutes 25 seconds

根据错误信息，可以将错误的根源定位到hadoop-1.2.1/src/contrib/ eclipse-plugin/ ivy.xml中的29行rev="${commons-logging.version}"。该值可以在hadoop-1.2.1/ivy/libraries.properties中找到，其原值为1.0.4，改为commons-logging.version=1.1.1即可。同时该输出信息还提示了[echo] eclipse.homeunset: skipping eclipse plugin，此信息提示变量eclipse.home未设置，而该变量在编译插件时是必须的，所以在hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml中添加eclipse的安装目录，添加如下代码：<propertyname="eclipse.home" value="/home/hadoop/eclipse"/>，该变量的值根据eclipse的实际安装目录而定。修改完毕后，再次在命令行中输入ant命令，结果如下：

 [hadoop@hadoop eclipse-plugin]$ antBuildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xmlcheck-contrib:init:     [echo] contrib: eclipse-plugininit-contrib:ivy-download:      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar      [get] Not modified - so not downloadedivy-probe-antlib:ivy-init-antlib:ivy-init:[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlivy-resolve-common:ivy-retrieve-common:[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlcompile:     [echo] contrib: eclipse-plugin    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:61: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds    [javac] Compiling 45 source files to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/classes    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:28: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileStatus;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:29: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.Path;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:25: 软件包 org.apache.hadoop.hdfs 不存在    [javac] import org.apache.hadoop.hdfs.DistributedFileSystem;    [javac]                              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:29: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileSystem;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:30: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.Path;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:36: 软件包 org.apache.hadoop.conf 不存在    [javac] import org.apache.hadoop.conf.Configuration;    [javac]                              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:38: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileSystem;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:39: 软件包 org.apache.hadoop.io 不存在    [javac] import org.apache.hadoop.io.IOUtils;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:40: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobClient;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:41: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobConf;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:42: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobID;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:43: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobStatus;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:44: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.RunningJob;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:54: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]   private DFSFolder(DFSPath parent, Path path) {    [javac]                                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:43: 找不到符号    [javac] 符号： 类 DistributedFileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]   private DistributedFileSystem dfs = null;    [javac]           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:45: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]   protected final Path path;    [javac]                   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:76: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]   protected DFSPath(DFSPath parent, Path path) {    [javac]                                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:134: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]   public Path getPath() {    [javac]          ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:144: 找不到符号    [javac] 符号： 类 DistributedFileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]   DistributedFileSystem getDFS() throws IOException {    [javac]   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSLocationsRoot.java:28: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileSystem;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:199: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]   private Configuration conf;    [javac]           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:209: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]   private transient Map<JobID, HadoopJob> runningJobs =    [javac]                         ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:24: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileSystem;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:25: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileUtil;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:26: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.Path;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:27: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.Counters;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:28: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobConf;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:29: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobID;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:30: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobStatus;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:31: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.RunningJob;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:291: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]   public Configuration getConfiguration() {    [javac]          ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/ConfProp.java:24: 软件包 org.apache.hadoop.conf 不存在    [javac] import org.apache.hadoop.conf.Configuration;    [javac]                              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:468: 找不到符号    [javac] 符号： 类 FileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]   public FileSystem getDFS() throws IOException {    [javac]          ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:477: 找不到符号    [javac] 符号： 类 JobClient    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]   public JobClient getJobClient() throws IOException {    [javac]          ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:76: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   final JobID jobId;    [javac]         ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:82: 找不到符号    [javac] 符号： 类 RunningJob    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   RunningJob running;    [javac]   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:89: 找不到符号    [javac] 符号： 类 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   JobStatus status;    [javac]   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:94: 找不到符号    [javac] 符号： 类 Counters    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   Counters counters;    [javac]   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:99: 找不到符号    [javac] 符号： 类 JobConf    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   JobConf jobConf = null;    [javac]   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:127: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   public HadoopJob(HadoopServer location, JobID id, RunningJob running,    [javac]                                           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:127: 找不到符号    [javac] 符号： 类 RunningJob    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   public HadoopJob(HadoopServer location, JobID id, RunningJob running,    [javac]                                                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:128: 找不到符号    [javac] 符号： 类 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]       JobStatus status) {    [javac]       ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:215: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   public JobID getJobID() {    [javac]          ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:278: 找不到符号    [javac] 符号： 类 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]   void update(JobStatus status) {    [javac]               ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:88: 找不到符号    [javac] 符号： 类 JobClient    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]     JobClient client = null;    [javac]     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:181: 找不到符号    [javac] 符号： 类 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]     private void updateJob(final HadoopJob job, JobStatus status) {    [javac]                                                 ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/ConfProp.java:138: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.ConfProp    [javac]   String get(Configuration conf) {    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/ConfProp.java:142: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.ConfProp    [javac]   void set(Configuration conf, String value) {    [javac]            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:34: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.FileStatus;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:35: 软件包 org.apache.hadoop.fs 不存在    [javac] import org.apache.hadoop.fs.Path;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:63: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFile    [javac]   public DFSFile(DFSPath parent, Path path, File file,    [javac]                                  ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:70: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFile    [javac]   public DFSFile(DFSPath parent, Path path) {    [javac]                                  ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/HadoopLocationWizard.java:31: 软件包 org.apache.hadoop.conf 不存在    [javac] import org.apache.hadoop.conf.Configuration;    [javac]                              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/RunOnHadoopWizard.java:31: 软件包 org.apache.hadoop.io 不存在    [javac] import org.apache.hadoop.io.IOUtils;    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/RunOnHadoopWizard.java:32: 软件包 org.apache.hadoop.mapred 不存在    [javac] import org.apache.hadoop.mapred.JobConf;    [javac]                                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/servers/ServerRegistry.java:31: 软件包 org.apache.hadoop.conf 不存在    [javac] import org.apache.hadoop.conf.Configuration;    [javac]                              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:66: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]     this.path = new Path("/");    [javac]                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:146: 找不到符号    [javac] 符号： 类 FileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]       FileSystem fs = location.getDFS();    [javac]       ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:147: 找不到符号    [javac] 符号： 类 DistributedFileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]       if (!(fs instanceof DistributedFileSystem)) {    [javac]                           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSPath.java:153: 找不到符号    [javac] 符号： 类 DistributedFileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSPath    [javac]       this.dfs = (DistributedFileSystem) fs;    [javac]                   ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:61: 找不到符号    [javac] 符号： 类 FileStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]     for (FileStatus status : getDFS().listStatus(this.getPath())) {    [javac]          ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:82: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]       Path filePath = new Path(this.path, file.getName());    [javac]       ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:82: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]       Path filePath = new Path(this.path, file.getName());    [javac]                           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:93: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]       Path filePath = new Path(this.path, file.getName());    [javac]       ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:93: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]       Path filePath = new Path(this.path, file.getName());    [javac]                           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFolder.java:152: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFolder    [javac]       getDFS().mkdirs(new Path(this.path, folderName));    [javac]                           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:116: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]         Set<JobID> missingJobIds =    [javac]             ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:117: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]             new HashSet<JobID>(runningJobs.keySet());    [javac]                         ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:119: 找不到符号    [javac] 符号： 类 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]         JobStatus[] jstatus = client.jobsToComplete();    [javac]         ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:120: 找不到符号    [javac] 符号： 类 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]         for (JobStatus status : jstatus) {    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:122: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]           JobID jobId = status.getJobID();    [javac]           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:130: 找不到符号    [javac] 符号： 类 RunningJob    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]               RunningJob running = client.getJob(jobId);    [javac]               ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:142: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer.LocationStatusUpdater    [javac]         for (JobID jobId : missingJobIds) {    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:210: 找不到符号    [javac] 符号： 类 JobID    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]       Collections.synchronizedMap(new TreeMap<JobID, HadoopJob>());    [javac]                                               ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:224: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     this.conf = new Configuration();    [javac]                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:238: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     this.conf = new Configuration();    [javac]                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:338: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     this.conf = new Configuration(existing.conf);    [javac]                     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:354: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     Configuration newConf = new Configuration(this.conf);    [javac]     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:354: 找不到符号    [javac] 符号： 类 Configuration    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     Configuration newConf = new Configuration(this.conf);    [javac]                                 ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:429: 找不到符号    [javac] 符号： 变量 IOUtils    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]       IOUtils.closeStream(fos);    [javac]       ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:469: 找不到符号    [javac] 符号： 变量 FileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     return FileSystem.get(this.conf);    [javac]            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:478: 找不到符号    [javac] 符号： 类 JobConf    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     JobConf jconf = new JobConf(this.conf);    [javac]     ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:478: 找不到符号    [javac] 符号： 类 JobConf    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     JobConf jconf = new JobConf(this.conf);    [javac]                         ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopServer.java:479: 找不到符号    [javac] 符号： 类 JobClient    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopServer    [javac]     return new JobClient(jconf);    [javac]                ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSLocationsRoot.java:131: 找不到符号    [javac] 符号： 变量 FileSystem    [javac]           FileSystem.closeAll();    [javac]           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:43: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]     PREPARE(JobStatus.PREP), RUNNING(JobStatus.RUNNING), FAILED(    [javac]             ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:43: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]     PREPARE(JobStatus.PREP), RUNNING(JobStatus.RUNNING), FAILED(    [javac]                                      ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:44: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]         JobStatus.FAILED), SUCCEEDED(JobStatus.SUCCEEDED);    [javac]         ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:44: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]         JobStatus.FAILED), SUCCEEDED(JobStatus.SUCCEEDED);    [javac]                                      ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:54: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]         case JobStatus.PREP:    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:56: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]         case JobStatus.RUNNING:    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:58: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]         case JobStatus.FAILED:    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:60: 找不到符号    [javac] 符号： 变量 JobStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob.JobState    [javac]         case JobStatus.SUCCEEDED:    [javac]              ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:146: 找不到符号    [javac] 符号： 类 FileSystem    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]       FileSystem fs = location.getDFS();    [javac]       ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:148: 找不到符号    [javac] 符号： 类 Path    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]       if (FileUtil.copy(fs, new Path(jobFile), tmp, false, location    [javac]                                 ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:148: 找不到符号    [javac] 符号： 变量 FileUtil    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]       if (FileUtil.copy(fs, new Path(jobFile), tmp, false, location    [javac]           ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:150: 找不到符号    [javac] 符号： 类 JobConf    [javac] 位置： 类 org.apache.hadoop.eclipse.server.HadoopJob    [javac]         this.jobConf = new JobConf(tmp.toString());    [javac]                            ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:302: 软件包 Counters 不存在    [javac]       Counters.Group group = counters.getGroup(groupName);    [javac]               ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/server/HadoopJob.java:305: 软件包 Counters 不存在    [javac]       for (Counters.Counter counter : group) {    [javac]                    ^    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/src/java/org/apache/hadoop/eclipse/dfs/DFSFile.java:74: 找不到符号    [javac] 符号： 类 FileStatus    [javac] 位置： 类 org.apache.hadoop.eclipse.dfs.DFSFile    [javac]       FileStatus fs = getDFS().getFileStatus(path);    [javac]       ^    [javac] 注意：某些输入文件使用或覆盖了已过时的 API。    [javac] 注意：要了解详细信息，请使用 -Xlint:deprecation 重新编译。    [javac] 注意：某些输入文件使用了未经检查或不安全的操作。    [javac] 注意：要了解详细信息，请使用 -Xlint:unchecked 重新编译。    [javac] 100 错误BUILD FAILED/home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:61: Compile failed; see the compiler error output for details.Total time: 12 seconds

由错误信息可知，classpath中没有包含hadoop相应的jar包。解决方法为在hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml中添加下面的代码：

 <path>         <filesetdir="${hadoop.root}">           <include name="hadoop*.jar"/>         </fileset>    </path>

同时将hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml中的<copyfile="${hadoop.root}/build/hadoop-core-${version}.jar" tofile="${build.dir}/lib/hadoop-core.jar"verbose="true"/>为<copy file="${hadoop.root}/hadoop-core-${version}.jar"tofile="${build.dir}/lib/hadoop-core.jar"verbose="true"/>，做完这些修改后，再次执行ant命令：

[hadoop@hadoop eclipse-plugin]$ antBuildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xmlcheck-contrib:init:     [echo] contrib: eclipse-plugininit-contrib:ivy-download:      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar      [get] Not modified - so not downloadedivy-probe-antlib:ivy-init-antlib:ivy-init:[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlivy-resolve-common:ivy-retrieve-common:[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlcompile:     [echo] contrib: eclipse-plugin    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:66: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds    [javac] Compiling 45 source files to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/classes    [javac] 注意：某些输入文件使用或覆盖了已过时的 API。    [javac] 注意：要了解详细信息，请使用 -Xlint:deprecation 重新编译。    [javac] 注意：某些输入文件使用了未经检查或不安全的操作。    [javac] 注意：要了解详细信息，请使用 -Xlint:unchecked 重新编译。jar:    [mkdir] Created dir: /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/libBUILD FAILED/home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:74: Warning: Could not find file /home/hadoop/hadoop-1.2.1/hadoop-core-${version}.jar to copy.Total time: 8 seconds

这次编译失败的原因是找不到hadoop-core-${version}.jar，也就是变量${version}未定义，其实在/hadoop-1.2.1/ivy/libraries.properties中定义了hadoop.version=1.2.1而不是version变量，或者将version替换为hadoop.version，或者在build.xml添加变量version，此次编译过程中选择后者<property name="version" value="1.2.1"/>，再次执行ant：

 [hadoop@hadoop eclipse-plugin]$ antBuildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xmlcheck-contrib:init:     [echo] contrib: eclipse-plugininit-contrib:ivy-download:      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar      [get] Not modified - so not downloadedivy-probe-antlib:ivy-init-antlib:ivy-init:[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlivy-resolve-common:ivy-retrieve-common:[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlcompile:     [echo] contrib: eclipse-plugin    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:67: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable buildsjar:     [copy] Copying 1 file to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib     [copy] Copying /home/hadoop/hadoop-1.2.1/hadoop-core-1.2.1.jar to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib/hadoop-core.jarBUILD FAILED/home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:76: Warning: Could not find file /home/hadoop/hadoop-1.2.1/build/ivy/lib/Hadoop/common/commons-cli-1.2.jar to copy.Total time: 17 seconds

失败原因是找不到commons-cli-1.2.jar。修复方法是修改build.xml文件，将<copy file="${hadoop.root}/build/ivy/lib/Hadoop/common/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib"verbose="true"/>修改为<copyfile="${hadoop.root}/lib/commons-cli-${commons-cli.version}.jar"  todir="${build.dir}/lib"verbose="true"/>，再次执行ant：

[hadoop@hadoop eclipse-plugin]$ antBuildfile: /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/ build.xmlcheck-contrib:init:     [echo] contrib: eclipse-plugininit-contrib:ivy-download:      [get] Getting: http://repo2.maven.org/maven2/org/apache/ivy/ivy/2.1.0/ivy-2.1.0.jar      [get] To: /home/hadoop/hadoop-1.2.1/ivy/ivy-2.1.0.jar      [get] Not modified - so not downloadedivy-probe-antlib:ivy-init-antlib:ivy-init:[ivy:configure] :: Ivy 2.1.0 - 20090925235825 :: http://ant.apache.org/ivy/ ::[ivy:configure] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlivy-resolve-common:ivy-retrieve-common:[ivy:cachepath] DEPRECATED: 'ivy.conf.file' is deprecated, use 'ivy.settings.file' instead[ivy:cachepath] :: loading settings :: file = /home/hadoop/hadoop-1.2.1/ivy/ivysettings.xmlcompile:     [echo] contrib: eclipse-plugin    [javac] /home/hadoop/hadoop-1.2.1/src/contrib/eclipse-plugin/build.xml:67: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable buildsjar:     [copy] Copying 1 file to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib     [copy] Copying /home/hadoop/hadoop-1.2.1/lib/commons-cli-1.2.jar to /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/lib/commons-cli-1.2.jar      [jar] Building jar: /home/hadoop/hadoop-1.2.1/build/contrib/eclipse-plugin/hadoop-eclipse-plugin-1.2.1.jarBUILD SUCCESSFULTotal time: 10 seconds

至此编译hadoop的eclipse插件成功完成。接下来试试是否可以正常工作，将编译成功的hadoop-1.2.1/build/contrib/eclipse-plugin/hadoop-eclipse-plugin-1.2.1.jar文件拷贝到eclipse下的plugins目录中，然后启动eclipse，在File菜单下选择New子菜单下的Other，弹出下面的窗口。可以发现已经有了Map/Reduce，说明插件已经生效。