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From Harsh J <ha...@cloudera.com>
Subject Re: Old vs New API
Date Wed, 24 Oct 2012 14:33:42 GMT
Using either is fully supported in 2.x+ at least. Neither is
deprecated, but I'd personally recommend using the new API going
forward. There's no known major issues with it.

FWIW, Apache HBase uses the new API for its MR-side utilities.

But in any case - no worries if you stick with one over the other for
whatever reason, not until a couple more major releases I should think.

On Wed, Oct 24, 2012 at 5:16 PM, Michael Segel
<michael_segel@hotmail.com> wrote:
> They were official, back around 2009, hence the first API was deprecated.
> The reason that they removed the deprecation was that the 'new' API didn't have all of
the features/methods of the old APIs.
> I learned using the new APIs and ToolRunner is your friend.
> So I would suggest using the new APIs.
> But that's just me.
> On Oct 24, 2012, at 5:02 AM, Alberto Cordioli <cordioli.alberto@gmail.com> wrote:
>> Thanks Bejoy,
>> my only concern is that the new api were to become "official" quite
>> some time ago, but this seems to be a long process.
>> And honestly I don't understand why. The changes are not so invasive.
>> I just want to be sure to learn the more suitable api for the future.
>> Anyway, as you said, let's see if a committer can comment on this.
>> Alberto
>> On 22 October 2012 15:40, Bejoy KS <bejoy.hadoop@gmail.com> wrote:
>>> Hi alberto
>>> The new mapreduce API is coming to shape now. The majority of the classes available
in old API has been ported to new API as well.
>>> The Old mapred API was marked depreciated in an earlier version of hadoop (0.20.x)
but later it was un-depreciated as all the functionality in old API was not available in new
mapreduce API at that point.
>>> Now mapreduce API is pretty good and you can go ahead with that for development.
 AFAIK mapreduce API is the future.
>>> Let's wait for a commiter to officially comment on this.
>>> Regards
>>> Bejoy KS
>>> Sent from handheld, please excuse typos.
>>> -----Original Message-----
>>> From: Alberto Cordioli <cordioli.alberto@gmail.com>
>>> Date: Mon, 22 Oct 2012 15:22:41
>>> To: <user@hadoop.apache.org>
>>> Reply-To: user@hadoop.apache.org
>>> Subject: Old vs New API
>>> Hi all,
>>> I am using last stable Hadoop version (1.0.3) and I am implementing
>>> right now my first MR jobs.
>>> I read about the presence of 2 API: the old and the new one. I read
>>> some stuff about them, but I am not able to find quite fresh news.
>>> I read that the old api was deprecated, but in my version they do not
>>> seem to. Moreover the new api does not have all the features
>>> implemented (see for example the package contrib with its classes to
>>> do joins).
>>> I found this post on the ML:
>>> <http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201002.mbox/%3Ca6906bde1002230730s24d6092av1e57b46bad8065f2@mail.gmail.com%3E>
>>> but it is very old (2010) and I think that further changes have been
>>> made meanwhile.
>>> My question is: does make sense to use the new api, instead of the old
>>> one? Does this new version providing other functionalities with
>>> respect to the older one?
>>> Or, given the slow progress in implementation, is better to use the old api?
>>> Thanks.
>> --
>> Alberto Cordioli

Harsh J

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