Flowbean
Web1.编程规范(1)用户编写的程序分成三个部分:Mapper,Reducer,Driver(提交运行mr程序的客户端)(2)Mapper的输入数据是KV对的形式(KV的类型可自定义)(3)Mapper的输出数据是KV对的形式(KV的类型可自定义)(4)Mapper中的业务逻辑写在map()方法中(5)map()方法(maptask进程)对每一个调用一次(6 ... Web两个方法:. 1.write: 进行序列化. 2.readFields:进行反序列化. (1) 反序列化时,需要反射调用空参构造函数,所以必须有空参构造. public FlowBean() { super(); } (2) 重写接口中的两个方法*** (注意:反序列化的顺序和序列化的顺序完全一致) 如数据结构中的队列一样先进先出 ...
Flowbean
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WebIn the following view, the managed bean named FlowBean is accessed to invoke a method, which will return an implicit navigational string directing the application to the next view in … Web[Hadoop Learning Project] 6. Use PARTITION customized partition processing data, Programmer Sought, the best programmer technical posts sharing site.
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