oh ... sorry you say you already tried that.
On Mon, Jan 24, 2011 at 1:54 PM, Ajo Fod <ajo....@gmail.com> wrote: > you could try to set the number of reducers e.g: > set mapred.reduce.tasks=4; > > set this before doing the select. > > -Ajo > > On Mon, Jan 24, 2011 at 1:13 PM, Jonathan Coveney <jcove...@gmail.com> wrote: >> I have a 10 node server or so, and have been mainly using pig on it, but >> would like to try out Hive. >> I am running this query, which doesn't take too long in Pig, but is taking >> quite a long time in Hive. >> >> hive -e "select count(1) as ct from my_table where v1='02' and v2 = >> 11112222;" > thecount >> One thing is that this job only uses 1 reducer, but it is taking most of its >> time in its reduce step. I tried manually setting more reducers, but I think >> that for a job without groups, it forces 1 reducer? >> Either way, would love to know why this is dragging? It's worth noting that >> my_table is not saved in the Hive format, but rather as a flat file. I >> realize that this can influence performance, but shouldn't it at least >> perform on par with pig? >> Thanks for your help >> Jon >
