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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