轉載自：http://blog.csdn.net/jiutianhe/article/details/39233609

1        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-PRoject/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/target/classes/org/apache/hadoop/yarn/server/applicationhistoryservice/ApplicationHistoryClientService$ApplicationHSClientProtocolHandler.class：路徑和文件名總長度不能超過260個字符系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip2        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/target/classes/org/apache/hadoop/yarn/server/applicationhistoryservice/timeline/LeveldbTimelineStore$LockMap$CountingReentrantLock.class：系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip3        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/target/test-classes/org/apache/hadoop/yarn/server/applicationhistoryservice/webapp/TestAHSWebApp$MockApplicationHistoryManagerImpl.class：系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip4        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/target/test-classes/org/apache/hadoop/yarn/server/resourcemanager/monitor/capacity/TestProportionalCapacityPreemptionPolicy$IsPreemptionRequestFor.class：路徑和文件名總長度不能超過260個字符系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip5        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/target/test-classes/org/apache/hadoop/yarn/server/resourcemanager/recovery/TestFSRMStateStore$TestFSRMStateStoreTester$TestFileSystemRMStore.class：系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip6        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/target/test-classes/org/apache/hadoop/yarn/server/resourcemanager/recovery/TestZKRMStateStore$TestZKRMStateStoreTester$TestZKRMStateStoreInternal.class：路徑和文件名總長度不能超過260個字符系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip7        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/target/test-classes/org/apache/hadoop/yarn/server/resourcemanager/recovery/TestZKRMStateStoreZKClientConnections$TestZKClient$TestForwardingWatcher.class：路徑和文件名總長度不能超過260個字符系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip8        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/target/test-classes/org/apache/hadoop/yarn/server/resourcemanager/recovery/TestZKRMStateStoreZKClientConnections$TestZKClient$TestZKRMStateStore.class：路徑和文件名總長度不能超過260個字符系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip9        : 無法創建文件：D:/hadoop2/hadoop-2.4.0-src/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/target/test-classes/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestRMAppAttemptTransitions$TestApplicationAttemptEventDispatcher.class：路徑和文件名總長度不能超過260個字符系統找不到指定的路徑。        D:/hadoop2/hadoop-2.4.0-src.zip2.通過maven獲取源碼這里需要說明的是，在使用maven的時候，需要先安裝jdk，protoc ，如果沒有安裝可以參考Win7如何安裝maven、安裝protoc（1）進入hadoop-2.4.0-src/hadoop-maven-plugins，運行mvn installD:/hadoop2/hadoop-2.4.0-src/hadoop-maven-plugins>mvn install復制代碼顯示如下信息[INFO] Scanning for projects...[WARNING][WARNING] Some problems were encountered while building the effective model fororg.apache.hadoop:hadoop-maven-plugins:maven-plugin:2.4.0[WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-enforcer-plugin @org.apache.hadoop:hadoop-project:2.4.0, D:/hadoop2/hadoop-2.4.0-src/hadoop-project/pom.xml, line 1015, column 15[WARNING][WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.[WARNING][WARNING] For this reason, future Maven versions might no longer support building such malformed projects.[WARNING][INFO][INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1[INFO][INFO] ------------------------------------------------------------------------[INFO] Building Apache Hadoop Maven Plugins 2.4.0[INFO] ------------------------------------------------------------------------[INFO][INFO] --- maven-antrun-plugin:1.7:run (create-testdirs) @ hadoop-maven-plugins---[INFO] Executing tasksmain:[INFO] Executed tasks[INFO][INFO] --- maven-plugin-plugin:3.0:descriptor (default-descriptor) @ hadoop-maven-plugins ---[INFO] Using 'UTF-8' encoding to read mojo metadata.[INFO] Applying mojo extractor for language: java-annotations[INFO] Mojo extractor for language: java-annotations found 2 mojo descriptors.[INFO] Applying mojo extractor for language: java[INFO] Mojo extractor for language: java found 0 mojo descriptors.[INFO] Applying mojo extractor for language: bsh[INFO] Mojo extractor for language: bsh found 0 mojo descriptors.[INFO][INFO] --- maven-resources-plugin:2.2:resources (default-resources) @ hadoop-maven-plugins ---[INFO] Using default encoding to copy filtered resources.[INFO][INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ hadoop-maven-plugins ---[INFO] Nothing to compile - all classes are up to date[INFO][INFO] --- maven-plugin-plugin:3.0:descriptor (mojo-descriptor) @ hadoop-maven-plugins ---[INFO] Using 'UTF-8' encoding to read mojo metadata.[INFO] Applying mojo extractor for language: java-annotations[INFO] Mojo extractor for language: java-annotations found 2 mojo descriptors.[INFO] Applying mojo extractor for language: java[INFO] Mojo extractor for language: java found 0 mojo descriptors.[INFO] Applying mojo extractor for language: bsh[INFO] Mojo extractor for language: bsh found 0 mojo descriptors.[INFO][INFO] --- maven-resources-plugin:2.2:testResources (default-testResources) @ hadoop-maven-plugins ---[INFO] Using default encoding to copy filtered resources.[INFO][INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ hadoop-maven-plugins ---[INFO] No sources to compile[INFO][INFO] --- maven-surefire-plugin:2.16:test (default-test) @ hadoop-maven-plugins---[INFO] No tests to run.[INFO][INFO] --- maven-jar-plugin:2.3.1:jar (default-jar) @ hadoop-maven-plugins ---[INFO] Building jar: D:/hadoop2/hadoop-2.4.0-src/hadoop-maven-plugins/target/hadoop-maven-plugins-2.4.0.jar[INFO][INFO] --- maven-plugin-plugin:3.0:addPluginArtifactMetadata (default-addPluginArtifactMetadata) @ hadoop-maven-plugins ---[INFO][INFO] --- maven-site-plugin:3.3:attach-descriptor (attach-descriptor) @ hadoop-maven-plugins ---[INFO][INFO] --- maven-install-plugin:2.3.1:install (default-install) @ hadoop-maven-plugins ---[INFO] Installing D:/hadoop2/hadoop-2.4.0-src/hadoop-maven-plugins/target/hadoop-maven-plugins-2.4.0.jar to C:/Users/hyj/.m2/repository/org/apache/hadoop/hadoop-maven-plugins/2.4.0/hadoop-maven-plugins-2.4.0.jar[INFO] Installing D:/hadoop2/hadoop-2.4.0-src/hadoop-maven-plugins/pom.xml to C:/Users/hyj/.m2/repository/org/apache/hadoop/hadoop-maven-plugins/2.4.0/hadoop-maven-plugins-2.4.0.pom[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 4.891 s[INFO] Finished at: 2014-06-23T14:47:33+08:00[INFO] Final Memory: 21M/347M[INFO] ------------------------------------------------------------------------復制代碼部分截圖如下：  （2）運行mvn eclipse:eclipse -DskipTests復制代碼這時候注意，我們進入的是hadoop_home,我這里是D:/hadoop2/hadoop-2.4.0-src部分信息如下[INFO][INFO] ------------------------------------------------------------------------[INFO] Reactor Summary:[INFO][INFO] Apache Hadoop Main ................................ SUCCESS [  0.684 s][INFO] Apache Hadoop Project POM ......................... SUCCESS [  0.720 s][INFO] Apache Hadoop Annotations ......................... SUCCESS [  0.276 s][INFO] Apache Hadoop Project Dist POM .................... SUCCESS [  0.179 s][INFO] Apache Hadoop Assemblies .......................... SUCCESS [  0.121 s][INFO] Apache Hadoop Maven Plugins ....................... SUCCESS [  1.680 s][INFO] Apache Hadoop MiniKDC ............................. SUCCESS [  1.802 s][INFO] Apache Hadoop Auth ................................ SUCCESS [  1.024 s][INFO] Apache Hadoop Auth Examples ....................... SUCCESS [  0.160 s][INFO] Apache Hadoop Common .............................. SUCCESS [  1.061 s][INFO] Apache Hadoop NFS ................................. SUCCESS [  0.489 s][INFO] Apache Hadoop Common Project ...................... SUCCESS [  0.056 s][INFO] Apache Hadoop HDFS ................................ SUCCESS [  2.770 s][INFO] Apache Hadoop HttpFS .............................. SUCCESS [  0.965 s][INFO] Apache Hadoop HDFS BookKeeper Journal ............. SUCCESS [  0.629 s][INFO] Apache Hadoop HDFS-NFS ............................ SUCCESS [  0.284 s][INFO] Apache Hadoop HDFS Project ........................ SUCCESS [  0.061 s][INFO] hadoop-yarn ....................................... SUCCESS [  0.052 s][INFO] hadoop-yarn-api ................................... SUCCESS [  0.842 s][INFO] hadoop-yarn-common ................................ SUCCESS [  0.322 s][INFO] hadoop-yarn-server ................................ SUCCESS [  0.065 s][INFO] hadoop-yarn-server-common ......................... SUCCESS [  0.972 s][INFO] hadoop-yarn-server-nodemanager .................... SUCCESS [  0.580 s][INFO] hadoop-yarn-server-web-proxy ...................... SUCCESS [  0.379 s][INFO] hadoop-yarn-server-applicationhistoryservice ...... SUCCESS [  0.281 s][INFO] hadoop-yarn-server-resourcemanager ................ SUCCESS [  0.378 s][INFO] hadoop-yarn-server-tests .......................... SUCCESS [  0.534 s][INFO] hadoop-yarn-client ................................ SUCCESS [  0.307 s][INFO] hadoop-yarn-applications .......................... SUCCESS [  0.050 s][INFO] hadoop-yarn-applications-distributedshell ......... SUCCESS [  0.202 s][INFO] hadoop-yarn-applications-unmanaged-am-launcher .... SUCCESS [  0.194 s][INFO] hadoop-yarn-site .................................. SUCCESS [  0.057 s][INFO] hadoop-yarn-project ............................... SUCCESS [  0.066 s][INFO] hadoop-mapreduce-client ........................... SUCCESS [  0.091 s][INFO] hadoop-mapreduce-client-core ...................... SUCCESS [  1.321 s][INFO] hadoop-mapreduce-client-common .................... SUCCESS [  0.786 s][INFO] hadoop-mapreduce-client-shuffle ................... SUCCESS [  0.456 s][INFO] hadoop-mapreduce-client-app ....................... SUCCESS [  0.508 s][INFO] hadoop-mapreduce-client-hs ........................ SUCCESS [  0.834 s][INFO] hadoop-mapreduce-client-jobclient ................. SUCCESS [  0.541 s][INFO] hadoop-mapreduce-client-hs-plugins ................ SUCCESS [  0.284 s][INFO] Apache Hadoop MapReduce Examples .................. SUCCESS [  0.851 s][INFO] hadoop-mapreduce .................................. SUCCESS [  0.099 s][INFO] Apache Hadoop MapReduce Streaming ................. SUCCESS [  0.742 s][INFO] Apache Hadoop Distributed Copy .................... SUCCESS [  0.335 s][INFO] Apache Hadoop Archives ............................ SUCCESS [  0.397 s][INFO] Apache Hadoop Rumen ............................... SUCCESS [  0.371 s][INFO] Apache Hadoop Gridmix ............................. SUCCESS [  0.230 s][INFO] Apache Hadoop Data Join ........................... SUCCESS [  0.184 s][INFO] Apache Hadoop Extras .............................. SUCCESS [  0.217 s][INFO] Apache Hadoop Pipes ............................... SUCCESS [  0.048 s][INFO] Apache Hadoop OpenStack support ................... SUCCESS [  0.244 s][INFO] Apache Hadoop Client .............................. SUCCESS [  0.590 s][INFO] Apache Hadoop Mini-Cluster ........................ SUCCESS [  0.230 s][INFO] Apache Hadoop Scheduler Load Simulator ............ SUCCESS [  0.650 s][INFO] Apache Hadoop Tools Dist .......................... SUCCESS [  0.334 s][INFO] Apache Hadoop Tools ............................... SUCCESS [  0.042 s][INFO] Apache Hadoop Distribution ........................ SUCCESS [  0.144 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 31.234 s[INFO] Finished at: 2014-06-23T14:55:08+08:00[INFO] Final Memory: 84M/759M[INFO] ------------------------------------------------------------------------復制代碼這時候，我們已經把源碼給下載下來了。這時候，我們會看到文件會明顯增大。 3.關聯eclipse源碼加入我們以下程序 hadoop2.2mapreduce例子.rar (1.14 MB, 下載次數: 68, 售價: 1 云幣) 如下圖示，對他們進行了打包 這兩個文件， MaxTemperature.zip為mapreduce例子，mockito-core-1.8.5.jar為mapreduce例子所引用的包（這里需要說明的是，mapreduce為2.2，但是不影響關聯源碼，只是交給大家該如何關聯源碼）我們解壓之后，導入eclipse（對于導入項目不熟悉，參考零基礎教你如何導入eclipse項目） 我們導入之后，看到很多的紅線，這些其實都是沒有引用包，下面我們開始解決這些語法問題。一、解決導入jar包（1）引入mockito-core-1.8.5.jar（2）hadoop2.4編譯包中的jar文件，這些文件的位置如下：hadoop_home中share/hadoop文件夾下，具體我這的位置D:/hadoop2/hadoop-2.4.0/share/hadoop找到里面的jar包，舉例如下：lib文件中的jar包，以及下面的jar包都添加到buildpath中。如果對于引用包，不知道該如何添加這些jar包，參考hadoop開發方式總結及操作指導。（注意的是，我們這里是引入的是編譯包，編譯的下載hadoop--642.4.0.tar.gz鏈接: http://pan.baidu.com/s/1c0vPjG0 密碼:xj6l）更多包下載可以參考hadoop家族、strom、spark、linux、flume等jar包、安裝包匯總下載  二、關聯源碼1.我們導入jar包之后，就沒有錯誤了，如下圖所示 2.找不到源碼當我們想看一個類或則函數怎么實現的時候，通過Open Call Hierarchy，卻找不到源文件。  3.Attach Source 上面三處，我們按照順序添加即可，我們選定壓縮包之后，單擊確定，ok了，我們的工作已經完畢。注意：對于hadoop-2.2.0-src.zip則是我們上面通過maven下載的源碼，然后壓縮的文件，記得一定是壓縮文件zip的形式4.驗證關聯后查看源碼我們再次執行上面操作，通過Open Call Hierarchy看到下面內容 然后我們雙擊上圖主類，即紅字部分，我們看到下面內容： 問題：細心的同學，這里面我們產生一個問題，因為我們看到的是.class文件，而不是.java文件。那么他會不會和我們所看到的.java文件不一樣那。其實是一樣的，感興趣的同學，可以驗證一下。