In Hadoop 0.21, I found InputFormat as an Interface in package mapred, and as an abstract class in package mapreduce.  The APIs are slightly different.  Which one should I choose to extend from or implement?  How are the two packages intended to be used differently?

Thanks,
Jane

mapred.* is the old, "stable" API, while the mapreduce.* stuff is
newer. With 0.21, I'd suggest using mapreduce.*

mapred.* stuff isn't compatible directly with mapreduce.*. If you are
using the New API all over (driver, mapper, etc.), you should use the
mapreduce.* only, right?

On Tue, Dec 7, 2010 at 3:05 AM, Jane Chen <[EMAIL PROTECTED]> wrote:
> In Hadoop 0.21, I found InputFormat as an Interface in package mapred, and as an abstract class in package mapreduce.  The APIs are slightly different.  Which one should I choose to extend from or implement?  How are the two packages intended to be used differently?
>
> Thanks,
> Jane
>
>
>
>

--
Harsh J
www.harshj.com

Harsh, thank you for your response.  That's what I guessed.

In 0.20, Interface InputFormat under mapred package was deprecated.  In 0.21, it is no longer deprecated.  Why is that?

Thanks,
Jane

--- On Tue, 12/7/10, Harsh J <[EMAIL PROTECTED]> wrote:

> From: Harsh J <[EMAIL PROTECTED]>
> Subject: Re: InputFormat in mapred vs. mapreduce.
> To: [EMAIL PROTECTED]
> Date: Tuesday, December 7, 2010, 5:51 AM
> mapred.* is the old, "stable" API,
> while the mapreduce.* stuff is
> newer. With 0.21, I'd suggest using mapreduce.*
>
> mapred.* stuff isn't compatible directly with mapreduce.*.
> If you are
> using the New API all over (driver, mapper, etc.), you
> should use the
> mapreduce.* only, right?
>
> On Tue, Dec 7, 2010 at 3:05 AM, Jane Chen <[EMAIL PROTECTED]>
> wrote:
> > In Hadoop 0.21, I found InputFormat as an Interface in
> package mapred, and as an abstract class in package
> mapreduce.  The APIs are slightly different.  Which one
> should I choose to extend from or implement?  How are the
> two packages intended to be used differently?
> >
> > Thanks,
> > Jane
> >
> >
> >
> >
>
>
>
> --
> Harsh J
> www.harshj.com
>

Jane Chen wrote:

> In 0.20, Interface InputFormat under mapred package was deprecated.
> In 0.21, it is no longer deprecated.  Why is that?

IIRC, it's because not all of the old features have yet been reproduced
in the new API, so it's premature to deprecate the old one.  The list
archives over the last six months (if not more) have several examples of
people running into that sort of problem.  (A non-InputFormat example is
MultipleOutputFormat, I believe.  Not sure about CombineFileInputFormat.)

Long-term, I believe the plan is still to deprecate mapred in favor of
mapreduce, but some of the plumbing remains to be done first.

Greg