On Wed, Jun 9, 2010 at 3:04 AM, wd <[email protected]> wrote: > I've tried hive 0.5, the option not work too. > And find this page[ > http://markmail.org/message/k32nrcb2ncsq67ef?q=mapred.map.tasks+#query:mapred.map.tasks%20+page:1+mid:k32nrcb2ncsq67ef+state:results] > via google. > > 2010/6/9 wd <[email protected]> > > hi, >> >> I'm using hive svn rev946854. And try to set mapred.map.tasks=1 at hive >> cli, but seemes it doesn't work, total map tasks still over 300+. >> >> Is this a svn version problem? >> > > You answered your own question, look in the link
"You cannot force *mapred.map.tasks* but can specify mapred.reduce.tasks. " Map tasks is based on the number of input files and folders. Even though hive uses a CombinedInput format you still can get a number of mappers. Edward
