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From "Thomas FRIOL (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-509) initTasks method in the JobInProgress class does not correctly configure the classloader with the custom map/reduce jar
Date Wed, 06 Sep 2006 06:24:22 GMT
initTasks method in the JobInProgress class does not correctly configure the classloader with
the custom map/reduce jar
-----------------------------------------------------------------------------------------------------------------------

                 Key: HADOOP-509
                 URL: http://issues.apache.org/jira/browse/HADOOP-509
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.5.0
            Reporter: Thomas FRIOL


In this part of code :

        JobConf jd = new JobConf(localJobFile);
        FileSystem fs = FileSystem.get(conf);
        String ifClassName = jd.get("mapred.input.format.class");
        InputFormat inputFormat;
        if (ifClassName != null && localJarFile != null) {
          try {
            ClassLoader loader =
              new URLClassLoader(new URL[]{ localFs.pathToFile(localJarFile).toURL() });
            Class inputFormatClass = Class.forName(ifClassName, true, loader);
            inputFormat = (InputFormat)inputFormatClass.newInstance();
          } catch (Exception e) {
            throw new IOException(e.toString());
          }
        } else {
          inputFormat = jd.getInputFormat();
        }

I think that the URLClassLoader should be added the URLs to all the jars contained in the
lib directory of the mapred jar. Or maybe, the jar should be unjarred and the classpath should
be updated as well as it is done into the TaskRunner class :

      String jar = conf.getJar();
      if (jar != null) {                      // if jar exists, it into workDir
        RunJar.unJar(new File(jar), workDir);
        File[] libs = new File(workDir, "lib").listFiles();
        if (libs != null) {
          for (int i = 0; i < libs.length; i++) {
            classPath.append(sep);            // add libs from jar to classpath
            classPath.append(libs[i]);
          }
        }
        classPath.append(sep);
        classPath.append(new File(workDir, "classes"));
        classPath.append(sep);
        classPath.append(workDir);
      }

Actually, it is not possible to load a custom InputFormat class. Any thoughts ?

PS : This issue comes following a discussion on the issue https://issues.apache.org/jira/browse/HADOOP-366



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