thanx for ur replies Mirko Kämpf and bertrand. i hv read in many of the
document for the creation of custom datatypes. i have nt tried with
advanced datatypes.I will Try and see.
Before tat...this wont fulfill my need right???
*public static class DoubleArrayWritable extends TwoDArrayWritable {
public DoubleArrayWritable() {
super(DoubleWritable.class);
}
}
*
* DoubleArrayWritable EArray = new DoubleArrayWritable();
DoubleWritable[][] Edata = new DoubleWritable[Erow][Ecol];
for (int k = 0; k < Erow; k++) {
for(int j=0;j< Ecol;j++){
Edata[k][j] = new DoubleWritable(E[k][j]);
}
}
EArray.set(Edata);
DoubleArrayWritable EDArray = new DoubleArrayWritable();
DoubleWritable[][] EDdata = new
DoubleWritable[EtransDerow][EtransDecol];
for (int k1 = 0; k1 < EtransDerow; k1++) {
for(int j1=0;j1< EtransDecol;j1++){
EDdata[k1][j1] = new DoubleWritable(ED[k1][j1]);
}
}
EDArray.set(EDdata);***
*context**.write(EArray, EDArray);*
The 2D array i need to emit is Edata and EDArray.I am changing the
double array to *DoubleArrayWritable *
,but y this dont work?
On Mon, Oct 28, 2013 at 5:22 PM, Bertrand Dechoux <[email protected]>wrote:
> Use @Override to specify that you indeed override the good methods.
>
> Bertrand
>
>
> On Mon, Oct 28, 2013 at 11:30 AM, Mirko Kämpf <[email protected]>wrote:
>
>> Hi,
>>
>> you should create a custom data type, which contains two of the
>> DoubleArrayWritable instances. This custom data type idea is also
>> explained here:
>> http://my.safaribooksonline.com/book/-/9781849517287/4dot-developing-complex-hadoop-mapreduce-applications/ch04s03_html
>>
>> Good luck.
>> Mirko
>>
>>
>>
>> 2013/10/28 unmesha sreeveni <[email protected]>
>>
>>>
>>> http://stackoverflow.com/questions/19602692/java-lang-classcastexception-in-hadoop-mapreduce
>>>
>>> I tried out, but it is not working.
>>>
>>> I was able to emit 1 2D array..but When i cross checked once more, i am
>>> not able to print the matrix(2D array) in reducer.
>>>
>>> Can anyone suggest me a gud way to emit 2 Matrices from mapper.
>>>
>>>
>>>
>>> --
>>> *Thanks & Regards*
>>> *
>>> *
>>> Unmesha Sreeveni U.B*
>>> *
>>> *Junior Developer
>>> *
>>> *Amrita Center For Cyber Security
>>> *
>>> *
>>> Amritapuri.
>>>
>>> www.amrita.edu/cyber/
>>> *
>>>
>>
>>
>
>
> --
> Bertrand Dechoux
>
--
*Thanks & Regards*
*
*
Unmesha Sreeveni U.B*
*
*Junior Developer
*
*Amrita Center For Cyber Security
*
*
Amritapuri.
www.amrita.edu/cyber/
*
