I am trying to run the matrix multiplication example mentioned(with source code) on the

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Editorial Team

Asked: May 27, 20262026-05-27T05:55:47+00:00 2026-05-27T05:55:47+00:00

I am trying to run the matrix multiplication example mentioned(with source code) on the

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I am trying to run the matrix multiplication example mentioned(with source code) on the following link:

http://www.norstad.org/matrix-multiply/index.html

I have hadoop setup in pseudodistributed mode and I configured it using this tutorial:

http://hadoop-tutorial.blogspot.com/2010/11/running-hadoop-in-pseudo-distributed.html?showComment=1321528406255#c3661776111033973764

When I run my jar file then I get the following error:

Identity test
11/11/30 10:37:34 INFO input.FileInputFormat: Total input paths to process : 2
11/11/30 10:37:34 INFO mapred.JobClient: Running job: job_201111291041_0010
11/11/30 10:37:35 INFO mapred.JobClient:  map 0% reduce 0%
11/11/30 10:37:44 INFO mapred.JobClient:  map 100% reduce 0%
11/11/30 10:37:56 INFO mapred.JobClient:  map 100% reduce 100%
11/11/30 10:37:58 INFO mapred.JobClient: Job complete: job_201111291041_0010
11/11/30 10:37:58 INFO mapred.JobClient: Counters: 17
11/11/30 10:37:58 INFO mapred.JobClient:   Job Counters
11/11/30 10:37:58 INFO mapred.JobClient:     Launched reduce tasks=1
11/11/30 10:37:58 INFO mapred.JobClient:     Launched map tasks=2
11/11/30 10:37:58 INFO mapred.JobClient:     Data-local map tasks=2
11/11/30 10:37:58 INFO mapred.JobClient:   FileSystemCounters
11/11/30 10:37:58 INFO mapred.JobClient:     FILE_BYTES_READ=114
11/11/30 10:37:58 INFO mapred.JobClient:     HDFS_BYTES_READ=248
11/11/30 10:37:58 INFO mapred.JobClient:     FILE_BYTES_WRITTEN=298
11/11/30 10:37:58 INFO mapred.JobClient:     HDFS_BYTES_WRITTEN=124
11/11/30 10:37:58 INFO mapred.JobClient:   Map-Reduce Framework
11/11/30 10:37:58 INFO mapred.JobClient:     Reduce input groups=2
11/11/30 10:37:58 INFO mapred.JobClient:     Combine output records=0
11/11/30 10:37:58 INFO mapred.JobClient:     Map input records=4
11/11/30 10:37:58 INFO mapred.JobClient:     Reduce shuffle bytes=60
11/11/30 10:37:58 INFO mapred.JobClient:     Reduce output records=2
11/11/30 10:37:58 INFO mapred.JobClient:     Spilled Records=8
11/11/30 10:37:58 INFO mapred.JobClient:     Map output bytes=100
11/11/30 10:37:58 INFO mapred.JobClient:     Combine input records=0
11/11/30 10:37:58 INFO mapred.JobClient:     Map output records=4
11/11/30 10:37:58 INFO mapred.JobClient:     Reduce input records=4
11/11/30 10:37:58 INFO input.FileInputFormat: Total input paths to process : 1
11/11/30 10:37:59 INFO mapred.JobClient: Running job: job_201111291041_0011
11/11/30 10:38:00 INFO mapred.JobClient:  map 0% reduce 0%
11/11/30 10:38:09 INFO mapred.JobClient:  map 100% reduce 0%
11/11/30 10:38:21 INFO mapred.JobClient:  map 100% reduce 100%
11/11/30 10:38:23 INFO mapred.JobClient: Job complete: job_201111291041_0011
11/11/30 10:38:23 INFO mapred.JobClient: Counters: 17
11/11/30 10:38:23 INFO mapred.JobClient:   Job Counters
11/11/30 10:38:23 INFO mapred.JobClient:     Launched reduce tasks=1
11/11/30 10:38:23 INFO mapred.JobClient:     Launched map tasks=1
11/11/30 10:38:23 INFO mapred.JobClient:     Data-local map tasks=1
11/11/30 10:38:23 INFO mapred.JobClient:   FileSystemCounters
11/11/30 10:38:23 INFO mapred.JobClient:     FILE_BYTES_READ=34
11/11/30 10:38:23 INFO mapred.JobClient:     HDFS_BYTES_READ=124
11/11/30 10:38:23 INFO mapred.JobClient:     FILE_BYTES_WRITTEN=100
11/11/30 10:38:23 INFO mapred.JobClient:     HDFS_BYTES_WRITTEN=124
11/11/30 10:38:23 INFO mapred.JobClient:   Map-Reduce Framework
11/11/30 10:38:23 INFO mapred.JobClient:     Reduce input groups=2
11/11/30 10:38:23 INFO mapred.JobClient:     Combine output records=2
11/11/30 10:38:23 INFO mapred.JobClient:     Map input records=2
11/11/30 10:38:23 INFO mapred.JobClient:     Reduce shuffle bytes=0
11/11/30 10:38:23 INFO mapred.JobClient:     Reduce output records=2
11/11/30 10:38:23 INFO mapred.JobClient:     Spilled Records=4
11/11/30 10:38:23 INFO mapred.JobClient:     Map output bytes=24
11/11/30 10:38:23 INFO mapred.JobClient:     Combine input records=2
11/11/30 10:38:23 INFO mapred.JobClient:     Map output records=2
11/11/30 10:38:23 INFO mapred.JobClient:     Reduce input records=2
Exception in thread "main" java.io.IOException: Cannot open filename /tmp/Matrix Multiply/out/_logs
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.ja va:1497)
        at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java :1488)
        at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:376)
        at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSyst em.java:178)
        at org.apache.hadoop.io.SequenceFile$Reader.openFile(SequenceFile.java:1 437)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:142 4)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:141 7)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:141 2)
        at TestMatrixMultiply.fillMatrix(TestMatrixMultiply.java:62)
        at TestMatrixMultiply.readMatrix(TestMatrixMultiply.java:84)
        at TestMatrixMultiply.checkAnswer(TestMatrixMultiply.java:108)
        at TestMatrixMultiply.runOneTest(TestMatrixMultiply.java:144)
        at TestMatrixMultiply.testIdentity(TestMatrixMultiply.java:156)
        at TestMatrixMultiply.main(TestMatrixMultiply.java:258)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

Can someone please suggest me that what am I doing wrong?Thanks

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1 Answer

Editorial Team · Answer 1 · 2026-05-27T05:55:48+00:00

It trys to read the job output. When you submit this to your cluster it will add this _log directory. Since directory are no sequence files, they can’t be read.

You have to change the code that reads this.

I have scripted something equal:

FileStatus[] stati = fs.listStatus(output);
for (FileStatus status : stati) {
    if (!status.isDir()) {
        Path path = status.getPath();
        // HERE IS THE READ CODE FROM YOUR EXAMPLE
    }
}

http://code.google.com/p/hama-shortest-paths/source/browse/trunk/hama-gsoc/src/de/jungblut/clustering/mapreduce/KMeansClusteringJob.java#127

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