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From "Chris K Wensel (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3021) Custom FileSystem class not found during child process initialization
Date Fri, 14 Mar 2008 18:56:26 GMT
Custom FileSystem class not found during child process initialization
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                 Key: HADOOP-3021
                 URL: https://issues.apache.org/jira/browse/HADOOP-3021
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.16.0
            Reporter: Chris K Wensel


If a custom FileSystem class is used for Reducer output, initialization of the child task
fails with an uncaught ClassNotFoundException. Trace follows.

java.lang.RuntimeException: java.lang.ClassNotFoundException: cascading.tap.hadoop.S3HttpFileSystem
java.io.IOException: java.lang.RuntimeException: java.lang.ClassNotFoundException: cascading.tap.hadoop.S3HttpFileSystem
       at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:607)
       at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:161)
       at org.apache.hadoop.fs.Path.getFileSystem(Path.java:175)
       at org.apache.hadoop.mapred.Task.getTaskOutputPath(Task.java:195)
       at org.apache.hadoop.mapred.Task.setConf(Task.java:400)
       at org.apache.hadoop.mapred.TaskInProgress.getTaskToRun(TaskInProgress.java:733)
       at org.apache.hadoop.mapred.JobInProgress.obtainNewMapTask(JobInProgress.java:568)
       at org.apache.hadoop.mapred.JobTracker.getNewTaskForTaskTracker(JobTracker.java:1409)
       at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:1191)
       at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)

Task.getTaskOutputPath only attempts to force the path into a fully qualified reference. It
already handles thrown IOE, and should possibly just catch Exception, or atleast explicitly
catch the CNFE. On a catch, can continue to return the original Path instance passed. 

  private Path getTaskOutputPath(JobConf conf) {
    Path p = new Path(conf.getOutputPath(), ("_" + taskId));
    try {
      FileSystem fs = p.getFileSystem(conf);
      return p.makeQualified(fs);
    } catch (IOException ie) {  // SHOULD BE BROADENED?
      LOG.warn(StringUtils.stringifyException(ie));
      return p;
    }
  }


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