What version of hadoop are you using? I believe this problem got resolved a while back (and 0.11.x has the fix).
Thanks Devaraj. > -----Original Message----- > From: Evan Liu [mailto:[EMAIL PROTECTED] > Sent: Monday, March 12, 2007 5:32 AM > To: [email protected] > Subject: Re: java.lang.NullPointerException im Sortetr/MergeQueue > > 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 > ------------------------------------- > 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.jav > a:2394) > > > > at > > org.apache.hadoop.io.SequenceFile$Sorter.merge(SequenceFile.java:2087) > > at > > > org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:4 > 98) > > > > 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 > > > >
