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From Michael Segel <michael_se...@hotmail.com>
Subject Re: Old vs New API
Date Wed, 24 Oct 2012 11:46:26 GMT
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

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