Seems you didn't register a Writable factory for your data type.
2010/7/19 Khaled BEN BAHRI
> Hello :)
>
> I developped my first mapreduce program with eclipse.
>
> when i want to execute it i have this error i tried to solve it but i
> failed :
>
>
>
> Jul 19, 2010 5:06:37 PM org.apache.hadoop.
The most likely problem I suspect is that you're emitting a key or a value
to the OutputCollector that does not inherit from o.a.h.io.Writable. Your
input/output types should all do this. There are stock implementations
(IntWritable, LongWritable, FloatWritable, Text -- for strings, etc.) of all
th
What hadoop version are you using ?
I guess you haven't specified io.serializations in your hadoop conf
Then by default your class should implement org.apache.hadoop.io.Writable
On Tue, Jul 20, 2010 at 6:01 AM, Khaled BEN BAHRI <
khaled.ben_ba...@it-sudparis.eu> wrote:
> hi
>
> When i wrote a ma
hi
When i wrote a mapreduce program
i have this error
please can any one help me
Jul 19, 2010 5:06:31 PM org.apache.hadoop.mapred.JobClient monitorAndPrintJob
INFO: Task Id : attempt_201007191410_0002_m_00_0, Status : FAILED
java.lang.NullPointerException
at
org.apache.hadoop.io.serialize
