Something to check (just in case): Are you getting identical results each time?
On Wed, Nov 4, 2015 at 8:54 AM, gen tang <gen.tan...@gmail.com> wrote: > Hi sparkers, > > I am using dataframe to do some large ETL jobs. > More precisely, I create dataframe from HIVE table and do some operations. > And then I save it as json. > > When I used spark-1.4.1, the whole process is quite fast, about 1 mins. > However, when I use the same code with spark-1.5.1(with tungsten turn on), > it takes a about 2 hours to finish the same job. > > I checked the detail of tasks, almost all the time is consumed by > computation. > > Any idea about why this happens? > > Thanks a lot in advance for your help. > > Cheers > Gen > >
