Thanks a lot for your reply, this really helps!
On 16 December 2010 18:08, Harsh J <[EMAIL PROTECTED]> wrote:
> On Thu, Dec 16, 2010 at 2:48 PM, Yu Li <[EMAIL PROTECTED]> wrote:
> > Hi all,
> > I'm a little confused about how to configure hadoop in a heterogeneous
> > cluster. For example, if I have one machine(m1) with a two-core
> > processor, another(m2) with a four-core processor, and I'd like to use
> > as tasktracker nodes in a hadoop cluster, how could I configure the
> > mapred.tasktracker.map/reduce.tasks.maximum? Could I set both parameters
> > 2 on m1, and set to 4 on m2?
> Yes you can do this just fine. Note that the configuration property
> name says "tasktracker" meaning it is a tasktracker specific setting
> and can vary for each. Has nothing to do with the JobTracker.
> > another word, among those massive of parameters in *-site.xml and
> > environtment variables in hadoop-env.sh, which ones could be set on each
> > DN/TT with different values and still take effect?
> *.tasktracker.* and *.datanode.* properties are TT and DN specific and
> can be set individually for each of them. This is due to a naming
> convention followed by Hadoop.
> Harsh J