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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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