-Re: Very strange Java Collection behavior in Hadoop
Jay Vyas 2012-03-23, 06:38
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, <[EMAIL PROTECTED]> wrote:
> 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" <[EMAIL PROTECTED]> wrote:
> >On Mon, Mar 19, 2012 at 11:05 PM, madhu phatak <[EMAIL PROTECTED]>
> >> 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
> >returns the same Text object with the contents of that object changed.
> >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