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From Jagat <jagatsi...@gmail.com>
Subject Re: Very strange Java Collection behavior in Hadoop
Date Fri, 23 Mar 2012 06:42:36 GMT
Hi Jay

Just follow this to install

http://jugnu-life.blogspot.in/2012/03/hadoop-installation-tutorial.html

The official tutorial at link below is also useful

http://hadoop.apache.org/common/docs/r1.0.1/single_node_setup.html

Thanks

Jagat

On Fri, Mar 23, 2012 at 12:08 PM, Jay Vyas <jayunit100@gmail.com> wrote:

> Hi guys : What the latest, simplest, best directions to get a tiny,
> psuedodistributed hadoop setup running on my ubuntu machine ?
>
> On Wed, Mar 21, 2012 at 5:14 PM, <Milind.Bhandarkar@emc.com> wrote:
>
> > Owen,
> >
> > Is there interest in reverting hadoop-2399 in 0.23.x ?
> >
> > - Milind
> >
> > ---
> > Milind Bhandarkar
> > Greenplum Labs, EMC
> > (Disclaimer: Opinions expressed in this email are those of the author,
> and
> > do not necessarily represent the views of any organization, past or
> > present, the author might be affiliated with.)
> >
> >
> >
> > On 3/19/12 11:20 PM, "Owen O'Malley" <omalley@apache.org> wrote:
> >
> > >On Mon, Mar 19, 2012 at 11:05 PM, madhu phatak <phatak.dev@gmail.com>
> > >wrote:
> > >
> > >> Hi Owen O'Malley,
> > >>  Thank you for that Instant reply. It's working now. Can you explain
> me
> > >> what you mean by "input to reducer is reused" in little detail?
> > >
> > >
> > >Each time the statement "Text value = values.next();" is executed it
> > >always
> > >returns the same Text object with the contents of that object changed.
> > >When
> > >you add the Text to the list, you are adding a pointer to the same Text
> > >object. At the end you have 6 copies of the same pointer instead of 6
> > >different Text objects.
> > >
> > >The reason that I said it is my fault, is because I added the
> optimization
> > >that causes it. If you are interested in Hadoop archeology, it was
> > >HADOOP-2399 that made the change. I also did HADOOP-3522 to improve the
> > >documentation in the area.
> > >
> > >-- Owen
> >
> >
>
>
> --
> Jay Vyas
> MMSB/UCHC
>

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