hadoop-mapreduce-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From li ping <li.j...@gmail.com>
Subject Re: Scheduler in Hadoop MR
Date Wed, 15 Dec 2010 01:25:56 GMT
sure, you can use multiple JTs. and also, you can deploy the every JT on
different machine.

On Wed, Dec 15, 2010 at 1:42 AM, Harsh J <qwertymaniac@gmail.com> wrote:

> On Thu, Dec 9, 2010 at 4:06 AM, Allen Wittenauer
> <awittenauer@linkedin.com> wrote:
> >
> > On Dec 7, 2010, at 6:47 PM, Harsh J wrote:
> >>> 1 - When we've two JobTrackers running simultaneously, each JobTracker
> is
> >>> running in a separate process?
> >>
> >> You can't run simultaneous JobTrackers for the same data-cluster
> >> AFAIK; only one JT process can exist. Did you mean jobs?
> >
> >        Sure you can.
> >
> >        Configure the task trackers to talk to specific job trackers.
> This does, however, have a very negative impact on data locality.
>
> Ah, so multiple JTs can use a common HDFS cluster? Or did you mean
> different clusters entirely, co-existing?
>
> >
> >
>
>
>
> --
> Harsh J
> www.harshj.com
>



-- 
-----李平

Mime
View raw message