從零教你如何獲取hadoop2.4源碼並使用eclipse關聯hadoop2.4源碼

時間  2019-12-10
標籤 如何 獲取 hadoop2.4 hadoop 源碼 並使 eclipse 關聯 欄目 Hadoop 简体版
原文   原文鏈接

從零教你如何獲取hadoop2.4源碼並使用eclipse關聯hadoop2.4源碼
http://www.aboutyun.com/thread-8211-1-1.html
(出處: about雲開發)php

 

問題導讀：
1.如何經過官網src包，獲取hadoop的所有代碼
2.經過什麼樣的操做，能夠查看hadoop某個函數或則類的實現？
3.maven的做用是什麼？






咱們若是想搞開發，研究源碼對咱們的幫助很大。不明白原理就如同黑盒子，遇到問題，咱們也摸不着思路。因此這裏交給你們
一.如何獲取源碼
二.如何關聯源碼

一.如何獲取源碼

1.下載hadoop的maven程序包

（1）官網下載
這裏咱們先從官網上下載maven包hadoop-2.4.0-src.tar.gz。
官網下載地址

對於不知道怎麼去官網下載，能夠查看：新手指導：hadoop官網介紹及如何下載hadoop（2.4）各個版本與查看hadoop API介紹

（2）網盤下載
也能夠從網盤下載：
http://pan.baidu.com/s/1kToPuGB

2.經過maven獲取源碼
獲取源碼的方式有兩種，一種是經過命令行的方式，一種是經過eclipse。這裏主要講經過命令的方式

經過命令的方式獲取源碼：
1.解壓包

 


解壓包的時候遇到了下面問題。不過不用管，咱們繼續往下走html

1        : 沒法建立文件：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$ApplicationHSClientProtocolHandler.class：
路徑和文件名總長度不能超過260個字符
系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
2        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-applicationhistoryservice\target\classes\org\apache\hadoop\yarn\server\applicationhistoryservice\timeline\LeveldbTimelineStore$LockMap$CountingReentrantLock.class：系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
3        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-applicationhistoryservice\target\test-classes\org\apache\hadoop\yarn\server\applicationhistoryservice\webapp\TestAHSWebApp$MockApplicationHistoryManagerImpl.class：系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
4        : 沒法建立文件：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$IsPreemptionRequestFor.class：
路徑和文件名總長度不能超過260個字符
系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
5        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-resourcemanager\target\test-classes\org\apache\hadoop\yarn\server\resourcemanager\recovery\TestFSRMStateStore$TestFSRMStateStoreTester$TestFileSystemRMStore.class：系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
6        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-resourcemanager\target\test-classes\org\apache\hadoop\yarn\server\resourcemanager\recovery\TestZKRMStateStore$TestZKRMStateStoreTester$TestZKRMStateStoreInternal.class：
路徑和文件名總長度不能超過260個字符
系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
7        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-resourcemanager\target\test-classes\org\apache\hadoop\yarn\server\resourcemanager\recovery\TestZKRMStateStoreZKClientConnections$TestZKClient$TestForwardingWatcher.class：
路徑和文件名總長度不能超過260個字符
系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
8        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-resourcemanager\target\test-classes\org\apache\hadoop\yarn\server\resourcemanager\recovery\TestZKRMStateStoreZKClientConnections$TestZKClient$TestZKRMStateStore.class：
路徑和文件名總長度不能超過260個字符
系統找不到指定的路徑。        D:\hadoop2\hadoop-2.4.0-src.zip
9        : 沒法建立文件：D:\hadoop2\hadoop-2.4.0-src\hadoop-yarn-project\hadoop-yarn\hadoop-yarn-server\hadoop-yarn-server-resourcemanager\target\test-classes\org\apache\hadoop\yarn\server\resourcemanager\rmapp\attempt\TestRMAppAttemptTransitions$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.zip



2.經過maven獲取源碼

這裏須要說明的是，在使用maven的時候，須要先安裝jdk，protoc ，若是沒有安裝能夠參考win7如何安裝maven、安裝protoc

（1）進入hadoop-2.4.0-src\hadoop-maven-plugins，運行mvn installjava

  1. D:\hadoop2\hadoop-2.4.0-src\hadoop-maven-plugins>mvn install
複製代碼



顯示以下信息node

  2. [INFO] Scanning for projects...
  3. [WARNING]
  4. [WARNING] Some problems were encountered while building the effective model for
  5. org.apache.hadoop:hadoop-maven-plugins:maven-plugin:2.4.0
  6. [WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found d
  7. uplicate declaration of plugin org.apache.maven.plugins:maven-enforcer-plugin @
  8. org.apache.hadoop:hadoop-project:2.4.0, D:\hadoop2\hadoop-2.4.0-src\hadoop-proje
  9. ct\pom.xml, line 1015, column 15
  10. [WARNING]
  11. [WARNING] It is highly recommended to fix these problems because they threaten t
  12. he stability of your build.
  13. [WARNING]
  14. [WARNING] For this reason, future Maven versions might no longer support buildin
  15. g such malformed projects.
  16. [WARNING]
  17. [INFO]
  18. [INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethrea
  19. ded.SingleThreadedBuilder with a thread count of 1
  20. [INFO]
  21. [INFO] ------------------------------------------------------------------------
  22. [INFO] Building Apache Hadoop Maven Plugins 2.4.0
  23. [INFO] ------------------------------------------------------------------------
  24. [INFO]
  25. [INFO] --- maven-antrun-plugin:1.7:run (create-testdirs) @ hadoop-maven-plugins
  26. ---
  27. [INFO] Executing tasks
  29. main:
  30. [INFO] Executed tasks
  31. [INFO]
  32. [INFO] --- maven-plugin-plugin:3.0:descriptor (default-descriptor) @ hadoop-mave
  33. n-plugins ---
  34. [INFO] Using 'UTF-8' encoding to read mojo metadata.
  35. [INFO] Applying mojo extractor for language: java-annotations
  36. [INFO] Mojo extractor for language: java-annotations found 2 mojo descriptors.
  37. [INFO] Applying mojo extractor for language: java
  38. [INFO] Mojo extractor for language: java found 0 mojo descriptors.
  39. [INFO] Applying mojo extractor for language: bsh
  40. [INFO] Mojo extractor for language: bsh found 0 mojo descriptors.
  41. [INFO]
  42. [INFO] --- maven-resources-plugin:2.2:resources (default-resources) @ hadoop-mav
  43. en-plugins ---
  44. [INFO] Using default encoding to copy filtered resources.
  45. [INFO]
  46. [INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ hadoop-maven-
  47. plugins ---
  48. [INFO] Nothing to compile - all classes are up to date
  49. [INFO]
  50. [INFO] --- maven-plugin-plugin:3.0:descriptor (mojo-descriptor) @ hadoop-maven-p
  51. lugins ---
  52. [INFO] Using 'UTF-8' encoding to read mojo metadata.
  53. [INFO] Applying mojo extractor for language: java-annotations
  54. [INFO] Mojo extractor for language: java-annotations found 2 mojo descriptors.
  55. [INFO] Applying mojo extractor for language: java
  56. [INFO] Mojo extractor for language: java found 0 mojo descriptors.
  57. [INFO] Applying mojo extractor for language: bsh
  58. [INFO] Mojo extractor for language: bsh found 0 mojo descriptors.
  59. [INFO]
  60. [INFO] --- maven-resources-plugin:2.2:testResources (default-testResources) @ ha
  61. doop-maven-plugins ---
  62. [INFO] Using default encoding to copy filtered resources.
  63. [INFO]
  64. [INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ hadoo
  65. p-maven-plugins ---
  66. [INFO] No sources to compile
  67. [INFO]
  68. [INFO] --- maven-surefire-plugin:2.16:test (default-test) @ hadoop-maven-plugins
  69. ---
  70. [INFO] No tests to run.
  71. [INFO]
  72. [INFO] --- maven-jar-plugin:2.3.1:jar (default-jar) @ hadoop-maven-plugins ---
  73. [INFO] Building jar: D:\hadoop2\hadoop-2.4.0-src\hadoop-maven-plugins\target\had
  74. oop-maven-plugins-2.4.0.jar
  75. [INFO]
  76. [INFO] --- maven-plugin-plugin:3.0:addPluginArtifactMetadata (default-addPluginA
  77. rtifactMetadata) @ hadoop-maven-plugins ---
  78. [INFO]
  79. [INFO] --- maven-site-plugin:3.3:attach-descriptor (attach-descriptor) @ hadoop-
  80. maven-plugins ---
  81. [INFO]
  82. [INFO] --- maven-install-plugin:2.3.1:install (default-install) @ hadoop-maven-p
  83. lugins ---
  84. [INFO] Installing D:\hadoop2\hadoop-2.4.0-src\hadoop-maven-plugins\target\hadoop
  85. -maven-plugins-2.4.0.jar to C:\Users\hyj\.m2\repository\org\apache\hadoop\hadoop
  86. -maven-plugins\2.4.0\hadoop-maven-plugins-2.4.0.jar
  87. [INFO] Installing D:\hadoop2\hadoop-2.4.0-src\hadoop-maven-plugins\pom.xml to C:
  88. \Users\hyj\.m2\repository\org\apache\hadoop\hadoop-maven-plugins\2.4.0\hadoop-ma
  89. ven-plugins-2.4.0.pom
  90. [INFO] ------------------------------------------------------------------------
  91. [INFO] BUILD SUCCESS
  92. [INFO] ------------------------------------------------------------------------
  93. [INFO] Total time: 4.891 s
  94. [INFO] Finished at: 2014-06-23T14:47:33+08:00
  95. [INFO] Final Memory: 21M/347M
  96. [INFO] ------------------------------------------------------------------------
複製代碼


部分截圖以下：

 


 



（2）運行

web

  1. mvn eclipse:eclipse -DskipTests
複製代碼

這時候注意，咱們進入的是hadoop_home,我這裏是D:\hadoop2\hadoop-2.4.0-src

部分信息以下shell

  1. [INFO]
  2. [INFO] ------------------------------------------------------------------------
  3. [INFO] Reactor Summary:
  4. [INFO]
  5. [INFO] Apache Hadoop Main ................................ SUCCESS [  0.684 s]
  6. [INFO] Apache Hadoop Project POM ......................... SUCCESS [  0.720 s]
  7. [INFO] Apache Hadoop Annotations ......................... SUCCESS [  0.276 s]
  8. [INFO] Apache Hadoop Project Dist POM .................... SUCCESS [  0.179 s]
  9. [INFO] Apache Hadoop Assemblies .......................... SUCCESS [  0.121 s]
  10. [INFO] Apache Hadoop Maven Plugins ....................... SUCCESS [  1.680 s]
  11. [INFO] Apache Hadoop MiniKDC ............................. SUCCESS [  1.802 s]
  12. [INFO] Apache Hadoop Auth ................................ SUCCESS [  1.024 s]
  13. [INFO] Apache Hadoop Auth Examples ....................... SUCCESS [  0.160 s]
  14. [INFO] Apache Hadoop Common .............................. SUCCESS [  1.061 s]
  15. [INFO] Apache Hadoop NFS ................................. SUCCESS [  0.489 s]
  16. [INFO] Apache Hadoop Common Project ...................... SUCCESS [  0.056 s]
  17. [INFO] Apache Hadoop HDFS ................................ SUCCESS [  2.770 s]
  18. [INFO] Apache Hadoop HttpFS .............................. SUCCESS [  0.965 s]
  19. [INFO] Apache Hadoop HDFS BookKeeper Journal ............. SUCCESS [  0.629 s]
  20. [INFO] Apache Hadoop HDFS-NFS ............................ SUCCESS [  0.284 s]
  21. [INFO] Apache Hadoop HDFS Project ........................ SUCCESS [  0.061 s]
  22. [INFO] hadoop-yarn ....................................... SUCCESS [  0.052 s]
  23. [INFO] hadoop-yarn-api ................................... SUCCESS [  0.842 s]
  24. [INFO] hadoop-yarn-common ................................ SUCCESS [  0.322 s]
  25. [INFO] hadoop-yarn-server ................................ SUCCESS [  0.065 s]
  26. [INFO] hadoop-yarn-server-common ......................... SUCCESS [  0.972 s]
  27. [INFO] hadoop-yarn-server-nodemanager .................... SUCCESS [  0.580 s]
  28. [INFO] hadoop-yarn-server-web-proxy ...................... SUCCESS [  0.379 s]
  29. [INFO] hadoop-yarn-server-applicationhistoryservice ...... SUCCESS [  0.281 s]
  30. [INFO] hadoop-yarn-server-resourcemanager ................ SUCCESS [  0.378 s]
  31. [INFO] hadoop-yarn-server-tests .......................... SUCCESS [  0.534 s]
  32. [INFO] hadoop-yarn-client ................................ SUCCESS [  0.307 s]
  33. [INFO] hadoop-yarn-applications .......................... SUCCESS [  0.050 s]
  34. [INFO] hadoop-yarn-applications-distributedshell ......... SUCCESS [  0.202 s]
  35. [INFO] hadoop-yarn-applications-unmanaged-am-launcher .... SUCCESS [  0.194 s]
  36. [INFO] hadoop-yarn-site .................................. SUCCESS [  0.057 s]
  37. [INFO] hadoop-yarn-project ............................... SUCCESS [  0.066 s]
  38. [INFO] hadoop-mapreduce-client ........................... SUCCESS [  0.091 s]
  39. [INFO] hadoop-mapreduce-client-core ...................... SUCCESS [  1.321 s]
  40. [INFO] hadoop-mapreduce-client-common .................... SUCCESS [  0.786 s]
  41. [INFO] hadoop-mapreduce-client-shuffle ................... SUCCESS [  0.456 s]
  42. [INFO] hadoop-mapreduce-client-app ....................... SUCCESS [  0.508 s]
  43. [INFO] hadoop-mapreduce-client-hs ........................ SUCCESS [  0.834 s]
  44. [INFO] hadoop-mapreduce-client-jobclient ................. SUCCESS [  0.541 s]
  45. [INFO] hadoop-mapreduce-client-hs-plugins ................ SUCCESS [  0.284 s]
  46. [INFO] Apache Hadoop MapReduce Examples .................. SUCCESS [  0.851 s]
  47. [INFO] hadoop-mapreduce .................................. SUCCESS [  0.099 s]
  48. [INFO] Apache Hadoop MapReduce Streaming ................. SUCCESS [  0.742 s]
  49. [INFO] Apache Hadoop Distributed Copy .................... SUCCESS [  0.335 s]
  50. [INFO] Apache Hadoop Archives ............................ SUCCESS [  0.397 s]
  51. [INFO] Apache Hadoop Rumen ............................... SUCCESS [  0.371 s]
  52. [INFO] Apache Hadoop Gridmix ............................. SUCCESS [  0.230 s]
  53. [INFO] Apache Hadoop Data Join ........................... SUCCESS [  0.184 s]
  54. [INFO] Apache Hadoop Extras .............................. SUCCESS [  0.217 s]
  55. [INFO] Apache Hadoop Pipes ............................... SUCCESS [  0.048 s]
  56. [INFO] Apache Hadoop OpenStack support ................... SUCCESS [  0.244 s]
  57. [INFO] Apache Hadoop Client .............................. SUCCESS [  0.590 s]
  58. [INFO] Apache Hadoop Mini-Cluster ........................ SUCCESS [  0.230 s]
  59. [INFO] Apache Hadoop Scheduler Load Simulator ............ SUCCESS [  0.650 s]
  60. [INFO] Apache Hadoop Tools Dist .......................... SUCCESS [  0.334 s]
  61. [INFO] Apache Hadoop Tools ............................... SUCCESS [  0.042 s]
  62. [INFO] Apache Hadoop Distribution ........................ SUCCESS [  0.144 s]
  63. [INFO] ------------------------------------------------------------------------
  64. [INFO] BUILD SUCCESS
  65. [INFO] ------------------------------------------------------------------------
  66. [INFO] Total time: 31.234 s
  67. [INFO] Finished at: 2014-06-23T14:55:08+08:00
  68. [INFO] Final Memory: 84M/759M
  69. [INFO] ------------------------------------------------------------------------
複製代碼

這時候，咱們已經把源碼給下載下來了。這時候，咱們會看到文件會明顯增大。


<ignore_js_op> 



3.關聯eclipse源碼

加入咱們如下程序
<ignore_js_op> hadoop2.2mapreduce例子.rar (1.14 MB, 下載次數: 7, 售價: 1 雲幣) 
以下圖示，對他們進行了打包
<ignore_js_op> 

這兩個文件， MaxTemperature.zip爲mapreduce例子，mockito-core-1.8.5.jar爲mapreduce例子所引用的包
（這裏須要說明的是，mapreduce爲2.2，可是不影響關聯源碼，只是交給你們該如何關聯源碼）
咱們解壓以後，導入eclipse
（對於導入項目不熟悉，參考零基礎教你如何導入eclipse項目）

<ignore_js_op> 


咱們導入以後，看到不少的紅線，這些其實都是沒有引用包，下面咱們開始解決這些語法問題。
1、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，這些文件的位置以下：

hadoop_home中share\hadoop文件夾下，具體我這的位置D:\hadoop2\hadoop-2.4.0\share\hadoop
找到裏面的jar包，舉例以下：lib文件中的jar包，以及下面的jar包都添加到buildpath中。
若是對於引用包，不知道該如何添加這些jar包，參考hadoop開發方式總結及操做指導。
（注意的是，咱們這裏是引入的是編譯包，編譯的下載hadoop--642.4.0.tar.gz
連接: http://pan.baidu.com/s/1c0vPjG0 密碼:xj6l）

更多包下載能夠參考hadoop家族、strom、spark、Linux、flume等jar包、安裝包彙總下載

apache



 


2、關聯源碼
1.咱們導入jar包以後，就沒有錯誤了，以下圖所示

 

2.找不到源碼

當咱們想看一個類或則函數怎麼實現的時候，經過Open Call Hierarchy，卻找不到源文件。

 



 


3.Attach Source

 

上面三處，咱們按照順序添加便可，咱們選定壓縮包以後，單擊肯定，ok了，咱們的工做已經完畢。

注意：對於hadoop-2.2.0-src.zip則是咱們上面經過maven下載的源碼，而後壓縮的文件，記得必定是壓縮文件zip的形式


4.驗證關聯後查看源碼

咱們再次執行上面操做，經過Open Call Hierarchy




看到下面內容



 


而後咱們雙擊上圖主類，即紅字部分，咱們看到下面內容：

> api

 




問題：
細心的同窗，這裏面咱們產生一個問題，由於咱們看到的是.class文件，而不是.java文件。那麼他會不會和咱們所看到的.java文件不同那。
實際上是同樣的，感興趣的同窗，能夠驗證一下。


下一篇：
如何經過eclipse查看、閱讀hadoop2.4源碼app

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