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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1846) Spurious ClassNotFoundException
Date Sat, 02 Nov 2013 03:12:17 GMT
Josh Elser created ACCUMULO-1846:
------------------------------------

             Summary: Spurious ClassNotFoundException
                 Key: ACCUMULO-1846
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1846
             Project: Accumulo
          Issue Type: Bug
            Reporter: Josh Elser
             Fix For: 1.6.0


>From the monitor:

{noformat}
Failed to load class 
	java.lang.ClassNotFoundException: org.apache.accumulo.master.recovery.HadoopLogCloser
		at org.apache.commons.vfs2.impl.VFSClassLoader.findClass(VFSClassLoader.java:175)
		at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
		at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
		at org.apache.accumulo.start.classloader.vfs.AccumuloVFSClassLoader.loadClass(AccumuloVFSClassLoader.java:102)
		at org.apache.accumulo.core.conf.AccumuloConfiguration.instantiateClassProperty(AccumuloConfiguration.java:193)
		at org.apache.accumulo.master.recovery.RecoveryManager.recoverLogs(RecoveryManager.java:162)
		at org.apache.accumulo.master.TabletGroupWatcher.run(TabletGroupWatcher.java:195)
{noformat}

>From the master.debug.log: 

{noformat}
2013-11-01 23:07:26,557 [master.EventCoordinator] INFO : tablet !!R<< was loaded on
localhost:9997
2013-11-01 23:07:26,567 [master.Master] DEBUG: Finished gathering information from 1 servers
in 0.01 seconds
2013-11-01 23:07:26,568 [master.Master] DEBUG: not balancing because there are unhosted tablets
2013-11-01 23:07:26,636 [recovery.RecoveryManager] DEBUG: Recovering hdfs://localhost:8020/accumulo1.6/wal/localhost+9997/224c63ac-a7db-4ba6-be87-a6d1fd7a0921
to hdfs://localhost:8020/accumulo1.6/recovery/224c63ac-a7db-4ba6-be87-a6d1fd7a0921d to load
class
        at org.apache.commons.vfs2.impl.VFSClassLoader.findClass(VFSClassLoader.java:175)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.accumulo.start.classloader.vfs.AccumuloVFSClassLoader.loadClass(AccumuloVFSClassLoader.java:102)
        at org.apache.accumulo.core.conf.AccumuloConfiguration.instantiateClassProperty(AccumuloConfiguration.java:193)
        at org.apache.accumulo.master.recovery.RecoveryManager.recoverLogs(RecoveryManager.java:162)
        at org.apache.accumulo.master.TabletGroupWatcher.run(TabletGroupWatcher.java:195)
2013-11-01 23:07:26,645 [conf.AccumuloConfiguration] INFO : Using org.apache.accumulo.server.master.recovery.HadoopLogCloser
2013-11-01 23:07:26,645 [recovery.RecoveryManager] INFO : Starting recovery of hdfs://localhost:8020/accumulo1.6/wal/localhost+9997/224c63ac-a7db-4ba6-be87-a6d1fd7a0921
(in : 10s) created for hdfs:, tablet !0;~< holds a reference
2013-11-01 23:07:26,647 [master.Master] DEBUG: 1 assigned to dead servers: [!0<;~@(null,localhost:9997[142010edaa87210],null)]...
{noformat}

I think I was seeing this when I intentionally set the tserver's heap very small to force
it to OOM during log recovery (to verify that WAL entries aren't prematurely deleted).



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