Hi Lin The default values for all the properties are in core-default.xml hdfs-default.xml and mapred-default.xml
Regards Bejoy KS On Tue, Sep 11, 2012 at 5:06 PM, Jason Yang <[email protected]>wrote: > Hi, Bejoy > > Thanks for you reply. > > where could I find the default value of mapred.reduce.tasks ? I have > checked the core-site.xml, hdfs-site.xml and mapred-site.xml, but I haven't > found it. > > > 2012/9/11 Bejoy Ks <[email protected]> > >> 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 >>> >>> >> > > > -- > YANG, Lin > >
