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From Wei Xue <simonxu...@gmail.com>
Subject Re: error when executing mapreduce program
Date Wed, 21 Jul 2010 01:30:41 GMT
Seems you didn't register a Writable factory for your data type.

2010/7/19 Khaled BEN BAHRI <Khaled.Ben_bahri@it-sudparis.eu>

> 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.mapred.JobClient
> monitorAndPrintJob
> INFO: Task Id : attempt_201007191410_0002_m_000001_1, Status : FAILED
> java.lang.NullPointerException
>        at
> org.apache.hadoop.io.serializer.SerializationFactory.getSerializer(SerializationFactory.java:73)
>        at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:797)
>        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:350)
>        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
>        at org.apache.hadoop.mapred.Child.main(Child.java:170)
>
>
>
>
> thanks for any help
>
> best regards
>
>

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