Results will be sorted by key so make A the key and put the rest in the value Chris On Jan 11, 2014 10:11 AM, "unmesha sreeveni" <[email protected]> wrote:
> What about sorting . > Acutually it is done by MapReduce itself. > But if we are giving a csv file as input and trying to sort one/multiple > column...Whether the corresponting columns also get reflectted?? > > eg: foo.csv > B,2,3 > A,4,6 > > When we apply sorting to first column:whether the resultent will be > A,4,6 > B,2,3 > A will be mapped to its correct values right? > If so what will be context.write() of mapper? > > > On Wed, Jan 8, 2014 at 8:18 PM, Chris Mawata <[email protected]>wrote: > >> Yes. >> Check out, for example, >> http://packtlib.packtpub.com/library/hadoop-mapreduce-cookbook/ch06lvl1sec66# >> >> >> >> On 1/8/2014 2:41 AM, unmesha sreeveni wrote: >> >> Can we do aggregation with in Hadoop MR >> like find min,max,sum,avg of a column in a csv file. >> >> -- >> *Thanks & Regards* >> >> Unmesha Sreeveni U.B >> Junior Developer >> >> http://www.unmeshasreeveni.blogspot.in/ >> >> >> >> > > > -- > *Thanks & Regards* > > Unmesha Sreeveni U.B > Junior Developer > > http://www.unmeshasreeveni.blogspot.in/ > > >
