Whats the difference?

[Girish Ravi <gi...@srmtech.com>]

Hi All,

I am trying to implement some MapReduce.

At one point I see there are different ways of creating Job:
org.apache.hadoop.mapreduce.Job
and
org.apache.hadoop.mapred.jobcontrol.Job

What's the difference between these?
Which should be used and when? Any suggestions? 

Regards
Girish
Ph: +91-9916212114

Re: Whats the difference?

[Harsh J <ha...@cloudera.com>]

Hey Girish,

The 'job control' package is a special purpose one and has been
documented here:
http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapreduce/lib/jobcontrol/JobControl.html

When wanting to create a simple job, use the
org.apache.hadoop.mapreduce.Job object instead, not the jobcontrol
package class with the same name.

On Sat, Jun 16, 2012 at 11:57 AM, Girish Ravi <gi...@srmtech.com> wrote:
> Hi All,
>
> I am trying to implement some MapReduce.
>
> At one point I see there are different ways of creating Job:
> org.apache.hadoop.mapreduce.Job
> and
> org.apache.hadoop.mapred.jobcontrol.Job
>
> What's the difference between these?
> Which should be used and when? Any suggestions?
>
> Regards
> Girish
> Ph: +91-9916212114



-- 
Harsh J

Re: Whats the difference?

[swathi v <sw...@gmail.com>]

Hi Girish,

The new release of Hadoop, has org.apache.hadoop.mapreduce.* package
structure
and the old API has org.apache.hadoop.mapred.* package structure.
The new API is designed so that it can evolve in future, the design
being abstract classes over interfaces, making use of Context objects.

The difference is that old API  has a special JobConf object for job
configuration, which is an extension of Hadoop’s vanilla Configuration
object. However, in the new API,  job configuration is done directly
through Configuration.

Thank You.


On Sat, Jun 16, 2012 at 11:57 AM, Girish Ravi <gi...@srmtech.com> wrote:

> Hi All,
>
> I am trying to implement some MapReduce.
>
> At one point I see there are different ways of creating Job:
> org.apache.hadoop.mapreduce.Job
> and
> org.apache.hadoop.mapred.jobcontrol.Job
>
> What's the difference between these?
> Which should be used and when? Any suggestions?
>
> Regards
> Girish
> Ph: +91-9916212114




-- 
- Regards,
Swathi.V. ,
Software Developer
Blog URL :http://femgeekz.blogspot.in