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- Timestamp:
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Jul 15, 2009, 5:29:03 PM (17 years ago)
- Author:
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waue
- Comment:
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| 1 | | = hadoop programming 0715 = |
| 2 | | * 整理出hadoop programming 的完全公式 |
| | 1 | = hadoop programming 完全公式 = |
| 3 | 2 | |
| 4 | 3 | || || || 輸入 key || || 輸入 value|| || 輸出 Key || || 輸出 Value|| || |
| … |
… |
|
| 10 | 9 | || output|| . || collect || ( || e || , || f || ) || || |
| 11 | 10 | |
| 12 | | |
| | 11 | * A, B, C, D ,E, F 分別代表可以用的類別;c, d, e, f 代表由C,D,E,F所產生的物件 |
| | 12 | * 有了這張表,我們規劃要寫M/R程式的時候: |
| | 13 | * 先把Map的輸入<key,value> 應該屬於哪種類別的,則A,B定好 |
| | 14 | * Map的輸出<key,value>定好,則 C,D也ok了 |
| | 15 | * 接下來想最終輸出的<key,value>該為何類別,則 E,F 決定好 |
| | 16 | * 分別填入 ABCDEF之後,整個程式的架構就出來了,接下來就看你的程式如何實做 |
| 13 | 17 | |
| 14 | 18 | {{{ |