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From "Tom White" <tom.e.wh...@gmail.com>
Subject Re: Problem running map reduce job - NoSuchMethodException
Date Tue, 26 Jun 2007 19:03:45 GMT
I've seen this exception when compiling against one version of hadoop
(e.g. 0.12.3) and running against another (e.g. 0.13.0). Could this be
the case?

Hope this helps,

Tom

On 26/06/07, Oliver Haggarty <ojh06@doc.ic.ac.uk> wrote:
> Hi, having got a few of the examples working on a small cluster of
> machines I tried writing my own map reduce task to run. Its basically
> similar to the PiEstimator (infact I copied much of the configuration
> code over with small modifications). I've packaged it all up in a jar
> file and tried the following, but get an exception:ray10% bin/hadoop jar
> euler.jar euler 0.1 3
> T = 3, step size = 0.1
> Wrote input for T = 0.1
>
> [etc etc...]
>
> Wrote input for T = 2.9999993
> Starting Job
> Done first bit //This was just a debugging println to check it could see
> the JobClient class
> java.lang.NoSuchMethodError:
> org.apache.hadoop.mapred.JobClient.runJob(Lorg/apache/hadoop/mapred/JobConf;)Lorg/apache/hadoop/mapred/RunningJob;
>          at imperial.oliverhaggarty.EulerMapRed.launch(EulerMapRed.java:199)
>          at imperial.oliverhaggarty.EulerMapRed.main(EulerMapRed.java:220)
>          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:585)
>          at
> org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
>          at
> org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:143)
>          at
> imperial.oliverhaggarty.ExampleDriver.main(ExampleDriver.java:18)
>          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:585)
>          at org.apache.hadoop.util.RunJar.main(RunJar.java:155)
>
> The PiEstimator works fine, and uses the same method call that is
> causing an exception in my own code (see below for code example). If
> anyone has any ideas as to what the problem is I would be very grateful.
>
> Thanks,
> Ollie
>
>
> The appropriate part of the code is:
> private static void launch(float step, int Trange) throws IOException {
>                 Configuration conf = new Configuration();
>             JobConf jobConf = new JobConf(conf, EulerMapRed.class);
>
>             jobConf.setJobName("euler");
>
> //        turn off speculative execution, because DFS doesn't handle
>             // multiple writers to the same file.
>             jobConf.setSpeculativeExecution(false);
>             jobConf.setInputFormat(SequenceFileInputFormat.class);
>
>             jobConf.setOutputKeyClass(FloatWritable.class);
>             jobConf.setOutputValueClass(FloatWritable.class);
>             jobConf.setOutputFormat(SequenceFileOutputFormat.class);
>
>             jobConf.setMapperClass(EulerMapper.class);
>             jobConf.setReducerClass(EulerReducer.class);
>
>             Path tmpDir = new Path("test-mini-mr");
>             Path inDir = new Path(tmpDir, "in");
>             Path outDir = new Path(tmpDir, "out");
>             FileSystem fileSys = FileSystem.get(jobConf);
>             fileSys.delete(tmpDir);
>             if (!fileSys.mkdirs(inDir)) {
>               throw new IOException("Mkdirs failed to create " + inDir.toString());
>             }
>
>             jobConf.setInputPath(inDir);
>             jobConf.setOutputPath(outDir);
>
>             jobConf.setNumMapTasks(Trange);
>
>             for(float T = step; T < Trange; T += step) {
>                 Path file = new Path(inDir, "part"+T);
>                 SequenceFile.Writer writer = SequenceFile.createWriter(fileSys,
> jobConf,
>                     file, FloatWritable.class, FloatWritable.class,
> CompressionType.NONE);
>                 writer.append(new FloatWritable(T), new FloatWritable(0));
>                 writer.close();
>                 System.out.println("Wrote input for T = "+T);
>             }
>
>             try {
>                 System.out.println("Starting Job");
>                 long startTime = System.currentTimeMillis();
>
>                 JobClient.getTaskOutputFilter(jobConf);//just put in to //check
> it can see the JobClient class
>                 System.out.println("Done first bit");
>                 JobClient.runJob(jobConf); //This line is causing the //problem
>                 System.out.println("Job Finished in "+
>                         (float)(System.currentTimeMillis() - startTime)/1000.0
> + " seconds");
>
>               } finally {
>                 fileSys.delete(tmpDir);
>               }
>

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