Re: Problem running map reduce job - NoSuchMethodException

[Oliver Haggarty]

Thanks Tom, that was exactly what I was doing - I had version 0.12.3 
installed, but downloaded the latest version from svn into Eclipse for 
development. I've now installed version 0.13.0 and the program runs. 
Just need to fix the bugs now! Thanks very much for your help.

Ollie
Tom White wrote:
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 <[EMAIL PROTECTED]> 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);
              }