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From "Dennis Kubes (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2107) Hadoop examples cannot execute on a single-node cluster post HADOOP-1622
Date Sat, 27 Oct 2007 05:04:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538165
] 

Dennis Kubes commented on HADOOP-2107:
--------------------------------------

This is due to a bug in the createJobJar method in JobClient not using the context classloader
to resolve classes.  I have created a patch for this and am in final testing right now.  I
have also brought the patch up to the current trunk level.  Patch should be posted within
an hour.

> Hadoop examples cannot execute on a single-node cluster post HADOOP-1622
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-2107
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2107
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Arun C Murthy
>            Assignee: Dennis Kubes
>            Priority: Blocker
>             Fix For: 0.16.0
>
>         Attachments: err.txt
>
>
> All hadoop examples on single-node  cluster, post HADOOP-1622, fail with:
> {noformat}
> Running 10 maps.
> Job started: Fri Oct 26 17:23:51 IST 2007
> 07/10/26 17:23:51 WARN mapred.JobClient: No job jar file set.  User classes may not be
found. See JobConf(Class) or JobConf#setJar(String).
> 07/10/26 17:23:52 INFO mapred.JobClient: Running job: job_200710261722_0001
> 07/10/26 17:23:53 INFO mapred.JobClient:  map 0% reduce 0%
> 07/10/26 17:24:07 INFO mapred.JobClient: Task Id : task_200710261722_0001_m_000000_0,
Status : FAILED
> java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException:
org.apache.hadoop.examples.RandomWriter$RandomInputFormat
> 	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:576)
> 	at org.apache.hadoop.mapred.JobConf.getInputFormat(JobConf.java:512)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:156)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1936)
> Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: org.apache.hadoop.examples.RandomWriter$RandomInputFormat
> 	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:544)
> 	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:568)
> 	... 3 more
> Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.examples.RandomWriter$RandomInputFormat
> 	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> 	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
> 	at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:242)
> 	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:524)
> 	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:542)
> 	... 4 more
> {noformat}
> The examples work once I reverted the HADOOP-1622 patch.

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