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Date: Mon, 12 Mar 2007 08:01:32 +0800
From: Evan Liu <qingyan.liu@alibaba-inc.com>
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To: hadoop-user@lucene.apache.org
Subject: Re: java.lang.NullPointerException im Sortetr/MergeQueue
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I've just come across exactly the same problem. Can anyone be so kind to 
help? Thanks!

sincerely,

Liu Qingyan - Evan Liu
Engineer of Platform, Yahoo! China
-------------------------------------
Backyard: liuqingy
Tel: +86-10-65985498
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Devoted, initiative, peaceful. All for work.
Stay hungry, stay foolish, stay cold.


Ion Badita wrote:
> Hi!
>
> I tried to run wordcount example with a 1,9 GB input file, on 6 Nodes.
> Hadoop has split the job in: 31 maps and one reduce.
>
> All the maps fail with this stacktrace
>
> java.lang.NullPointerException
>     at 
> org.apache.hadoop.io.SequenceFile$Sorter$MergeQueue.merge(SequenceFile.java:2394) 
>
>     at 
> org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2087)
>     at 
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:498) 
>
>     at org.apache.hadoop.mapred.MapTask.run(MapTask.java:191)
>     at 
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1372)
>
>
> I tried the example with hadoop 0.10.1 and nightly build 
> hadoop-2007-02-02 (with the same input), i got the same exception.
>
> Any help will be appreciated.
> Thanks!
>
> John
>
>