[HADOOP-2107] Hadoop examples cannot execute on a single-node cluster post HADOOP-1622

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Duplicate
• Affects Version/s: 0.16.0
• Assignee: Dennis Kubes
• Reporter: Arun Murthy
• Created: 26/Oct/07 11:57
• Updated: 08/Jul/09 16:52
• Resolved: 26/Oct/07 20:43

Description

All hadoop examples on single-node cluster, post HADOOP-1622, fail with:

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

The examples work once I reverted the HADOOP-1622 patch.