Mailing-List: contact mapreduce-user-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: mapreduce-user@hadoop.apache.org
Received-SPF: pass (nike.apache.org: domain of joey@cloudera.com designates
 209.85.161.48 as permitted sender)
MIME-Version: 1.0
In-Reply-To: 
 <CABBQHVch=0bk=c4o4_FhGKauNUPBsJf-Hg8-STnfL6AvT36Odg@mail.gmail.com>
References: 
 <CABBQHVch=0bk=c4o4_FhGKauNUPBsJf-Hg8-STnfL6AvT36Odg@mail.gmail.com>
Date: Wed, 21 Sep 2011 11:20:22 -0400
Message-ID: 
 <CAEGKEUPXSphQmRFzV294sLDOueumEP=+V_38ustVcAU2QWnDvQ@mail.gmail.com>
Subject: Re: 7 of 487 New window Print all Can JobConf object be declared
 global and used in mapper and reducer class
From: Joey Echeverria <joey@cloudera.com>
To: mapreduce-user@hadoop.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

The map and reduce functions are running a different JVM, so they
never ran the main() method. You can implement a=A0configure(JobConf
job)=A0method in your map and reduce classes which will be passed the
JobConf you used to launch the job.

-Joey

On Wed, Sep 21, 2011 at 9:36 AM, pranjal shrivastava
<brilliantpj@gmail.com> wrote:
>
> pranjal shrivastava to mapreduce-user.
> show details 9:12 AM (22 minutes ago)
> Hi
> I declared JobConf object static and globally in the main class and initi=
alized it in the main function.Since it is global and static to inner mappe=
r and reducer classes ,I tried to JobConf object in the mapper and reducer =
function.But on doing this I find JobConf object to be null.Why is this hap=
pening .
>
> Code is like
> class wordcount{
> private static JobConf conf;
>
> //public static mapperclass{
> =A0=A0=A0 //I try to access conf object here which comes to be null
>
> }
> //public static reducerclass{
> }
> public static void main(String args[]){
> conf=3Dnew JobConf(wordcount.class)
> //set mapper class
> //setreducer class
> //set job client
> //launch the mappers,reducers
> }
> }
>
> Whats going wrong?Why I am not able to access conf object in mapper.I nee=
d this for using distributed cache files.
>
> Thank you
> Pranjal


--
Joseph Echeverria
Cloudera, Inc.
443.305.9434