我试图运行提到的矩阵乘法的例子(源代码):MapReduce的矩阵乘法与下面的链接上的hadoop
http://www.norstad.org/matrix-multiply/index.html
我在pseudodistributed模式的hadoop设置和我配置它使用此教程:
当我运行我的jar文件,然后我得到以下错误:
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)
可有人请建议我,我究竟做错了什么?谢谢
谢谢托马斯。我说得对。你有什么想法,关于我提到的矩阵乘法的例子,为什么这个工作正常,而且在hadoop独立模式下工作正常,但在检查答案的时候不能与hadoop分布模式一起工作? – waqas
因为在分布式模式下运行时,_log存储在HDFS中,在伪分布式模式/独立模式下,这将存储在tasktracker日志中。 –