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From "Chris K Wensel (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3021) Custom FileSystem class not found during child process initialization
Date Fri, 14 Mar 2008 18:58:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris K Wensel updated HADOOP-3021:
-----------------------------------

    Description: 
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. 

{code:title=Bar.java|borderStyle=solid}
  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;
    }
  }
{code}

  was:
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;
    }
  }



> Custom FileSystem class not found during child process initialization
> ---------------------------------------------------------------------
>
>                 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. 
> {code:title=Bar.java|borderStyle=solid}
>   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;
>     }
>   }
> {code}

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