FAQ
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.(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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  • Wei Xue at Jul 21, 2010 at 1:31 am
    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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postedJul 19, '10 at 3:39p
activeJul 21, '10 at 1:31a
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