number of mappers depend on the number of dfs blocks you file spans across , considering standard file input formatter. unlike reducers , where you configure as how many reducers you want for your job.
thanks, Rahul On Tue, Nov 12, 2013 at 9:00 PM, unmesha sreeveni <[email protected]>wrote: > For my 5000 recorded file .. How many mappers will be running? > > And is there a way to know how my files are splited? > > > On Wed, Nov 13, 2013 at 9:51 AM, unmesha sreeveni > <[email protected]>wrote: > >> How to set the no of mappers? >> >> I am running a job with input file of 5000 records.but actually it is a >> small file for hadoop..but i need to know whether it can be exceuted faster. >> >> when i tried to run my job it took nearly 30 min to complete my job... >> why so? >> >> If i set my mappers to a lower count whether any reflection happens to my >> job performance? >> >> -- >> *Thanks & Regards* >> >> Unmesha Sreeveni U.B >> >> *Junior Developer* >> >> >> > > > -- > *Thanks & Regards* > > Unmesha Sreeveni U.B > > *Junior Developer* > > >
