hadoop-mapreduce-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ted Yu <yuzhih...@gmail.com>
Subject Re: INFO: Task Id : attempt_201007191410_0002_m_000000_0, Status : FAILED
Date Wed, 21 Jul 2010 00:03:10 GMT
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_bahri@it-sudparis.eu> wrote:

> 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_000000_0, 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 in advance for help
>
> regards
>
>
>

Mime
View raw message