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關於Map/Reduce part. 2
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T
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Dec 3, 2011, 1:11:42 AM
12/3/11
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請問 MR作業 part. 2,意思是直接用java寫一個照"出現次數"排序map/reduce後的結果的程式嗎?
謝謝
T
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Dec 3, 2011, 2:20:53 AM
12/3/11
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另外也想問一下part.1的mapper部份,except " " 是指?
周宗毅
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Dec 4, 2011, 12:14:02 AM
12/4/11
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Hi ,
1. 請問 MR作業 part. 2,意思是直接用java寫一個照"出現次數"排序map/
reduce後的結果的程式嗎?
這一題應該是要求你 "using the mapreduce programming model. "
而非在做完map/reduce之後再去排序
2.
except " "
這個就是指說請忽略
空白character
楊惠敏
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Dec 10, 2011, 5:42:10 AM
12/10/11
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藉標題詢問一下~
請問 map/reduce part2 的部份
如果 output 出來的每個 file 內部都是 sort 好的,但是 file 之間不連續,如下面的例子:
part-r-00000
a 20
e 15
c 9
part-r-00001
t 12
i 10
s 7
請問這樣有符合要求嗎?
周宗毅
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Dec 10, 2011, 6:59:23 AM
12/10/11
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Hi ,
你可以嘗試看將output的檔案變成只有一個~
並嘗試看看該結果:D
我想這是符合格式的~
楊惠敏
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Dec 10, 2011, 8:18:03 AM
12/10/11
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嗯嗯~ 我試過了,結果是對的
謝謝助教:)
Chien
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Dec 12, 2011, 8:27:40 AM
12/12/11
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想請問一下助教,此排序有限定輸出格式嗎?
還是只要有達到數字由小排到大,或是由大排到小就可以了呢?
謝謝:)
Yafang
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Dec 12, 2011, 8:30:46 AM
12/12/11
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沒有限定,
只要你有在報告或是readme中註明是小到大或是大到小就可以了
謝謝
周宗毅
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Dec 12, 2011, 8:30:56 AM
12/12/11
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Hi ,
並沒有設限~
不過請在readme中註明你使用的方式以及排序的依據:)
謝謝!
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