Hi, If you are using a custom writable object while passing data from the mapper to the reducer make sure that the read fields and the write has the same number of variables. It might be possible that you wrote datavtova file using custom writable but later modified the custom writable (like adding new attribute to the writable) which the old data doesn't have.
It might be a possibility is please check once On Friday, May 25, 2012, waqas latif wrote: > Hi Experts, > > I am fairly new to hadoop MapR and I was trying to run a matrix > multiplication example presented by Mr. Norstadt under following link > http://www.norstad.org/matrix-multiply/index.html. I can run it > successfully with hadoop 0.20.2 but I tried to run it with hadoop 1.0.3 but > I am getting following error. Is it the problem with my hadoop > configuration or it is compatibility problem in the code which was written > in hadoop 0.20 by author.Also please guide me that how can I fix this error > in either case. Here is the error I am getting. > > in thread "main" java.io.EOFException > at java.io.DataInputStream.readFully(DataInputStream.java:180) > at java.io.DataInputStream.readFully(DataInputStream.java:152) > at > org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1508) > at > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1486) > at > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1475) > at > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1470) > at TestMatrixMultiply.fillMatrix(TestMatrixMultiply.java:60) > at TestMatrixMultiply.readMatrix(TestMatrixMultiply.java:87) > at TestMatrixMultiply.checkAnswer(TestMatrixMultiply.java:112) > at TestMatrixMultiply.runOneTest(TestMatrixMultiply.java:150) > at TestMatrixMultiply.testRandom(TestMatrixMultiply.java:278) > at TestMatrixMultiply.main(TestMatrixMultiply.java:308) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.util.RunJar.main(RunJar.java:156) > > Thanks in advance > > Regards, > waqas >
