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                            ## 在線練習

[http://cloudcomputing.ruc.edu.cn](http://cloudcomputing.ruc.edu.cn)

## 處理

1. select：直接分析輸入數據，取出需要的字段數據即可
1. where: 也是對輸入數據處理的過程中進行處理，判斷是否需要該數據
1. aggregation:min, max, sum
1. group by: 通過Reducer實現
1. sort
1. join: map join, reduce join

## Third-Party Libraries

export LIBJARS=$MYLIB/commons-lang-2.3.jar, hadoop jar prohadoop-0.0.1-SNAPSHOT.jar org.aspress.prohadoop.c3. WordCountUsingToolRunner -libjars $LIBJARS

hadoop jar prohadoop-0.0.1-SNAPSHOT-jar-with-dependencies.jar org.aspress.prohadoop.c3. WordCountUsingToolRunner The dependent libraries are now included inside the application JAR file

一般還是上面的好，指定依賴可以利用Public Cache，如果是包含依賴，則每次都需要拷貝

## 參考書籍

[MapReduce Design Patterns](http://book.douban.com/subject/11229683/)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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