That gets tricky if you have input data that is heavily filtered though. Perhaps play around with the scale factor on operations that may blow up data?
On Sun, Oct 16, 2016, 10:04 PM 陈竞 <[email protected]> wrote: > that's a solution, but, since user may not clearly know whic step will > produce tempoary table, i think setting reduce number automatically will > improve user experience. I think maybe we can set reduce number as 1/3 > mapper number before submitting jobs if one of the job inputs is temporary > table. > > 2016-10-14 18:59 GMT+08:00 David Ortiz <[email protected]>: > > You can manually set the reducer number using the conf object among other > things. > > On Fri, Oct 14, 2016, 5:43 AM 陈竞 <[email protected]> wrote: > > hi, i found that if the pipeline produce temporary table , the reduce > number of the temporary table whose input table is temporary table become > to small, since temporary table has no content . > > > > > -- > 陈竞，中科院计算技术研究所，高性能计算机中心 > Jing Chen HPCC.ICT.AC China >
