Hi Lin The default value for number of reducers is 1
<name>mapred.reduce.tasks</name> <value>1</value> It is not determined by data volume. You need to specify the number of reducers for your mapreduce jobs as per your data volume. Regards Bejoy KS On Tue, Sep 11, 2012 at 4:53 PM, Jason Yang <[email protected]>wrote: > Hi, all > > I was wondering what's the default number of reducer if I don't set it in > configuration? > > Will it change dynamically according to the output volume of Mapper? > > -- > YANG, Lin > >
