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From Filippo Diotalevi <fili...@ntoklo.com>
Subject Troubleshoot job failures after upgrade to 1.0.2
Date Thu, 19 Apr 2012 17:28:58 GMT
Hi, 
I have an application on Cassandra 1.0.8 + Hadoop. Previously running on the cloudera distribution
hadoop-0.20.2-cdh3u1, I tried today to upgrade to Hadoop 1.0.2 but stumbled in issues with
consistent job failures

The hadoop userlogs seem quite clear:

2012-04-19 18:21:09.837 java[57837:1903] Unable to load realm info from SCDynamicStore
Apr 19, 2012 6:21:10 PM org.apache.hadoop.util.NativeCodeLoader <clinit>
WARNING: Unable to load native-hadoop library for your platform... using builtin-java classes
where applicable
Apr 19, 2012 6:21:10 PM org.apache.hadoop.mapred.Child main
SEVERE: Error running child : java.lang.NoClassDefFoundError: Could not initialize class org.apache.log4j.LogManager
at org.apache.hadoop.mapred.TaskLog.syncLogs(TaskLog.java:334)
at org.apache.hadoop.mapred.Child.main(Child.java:229)


In particular, the SEVERE: Error running child : java.lang.NoClassDefFoundError: Could not
initialize class org.apache.log4j.LogManager seem to be the most reasonable cause. 

Can you help me troubleshoot the cause of the failure?  

Thanks,
-- 
Filippo Diotalevi


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