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                            使用Tez引擎代替MapReduce引擎。
Tez 是一個開源的支持DAG作業的計算框架，它來源于MapReduce框架。
```sql
-- 使用Tez代替MapReduce
set hive.execution.engine=tez;

-- Hive2.1.0的版本有一個BUG HIVE-14121
-- 使用Tez的時候需要設置如下參數值
set hive.mapjoin.hybridgrace.hashtable=false
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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