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
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Backyard: liuqingy
Tel: +86-10-65985498
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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
