The real reduce logic is actually started when all map tasks are finished. Is it still unexpected?
On 7/28/08, 晋光峰 <[EMAIL PROTECTED]> wrote: > > Dear All, > > When i using Hadoop, I noticed that the reducer step is started immediately > when the mappers are still running. According to my project requirement, > the > reducer step should not start until all the mappers finish their execution. > Anybody knows how to use some Hadoop API to achieve this? When all the > mappers finish their process, then the reducer is started. > > Thanks > -- > Guangfeng Jin > -- 朱盛凯 Jash Zhu 复旦大学软件学院 Software School, Fudan University
