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From "Jackson Chung (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4255) concurrent modif ex when repair is run on LCS
Date Thu, 17 May 2012 18:30:08 GMT
Jackson Chung created CASSANDRA-4255:
----------------------------------------

             Summary: concurrent modif ex when repair is run on LCS
                 Key: CASSANDRA-4255
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4255
             Project: Cassandra
          Issue Type: Bug
            Reporter: Jackson Chung


came across this, will try to figure a way to systematically reprod this. But the problem
is the sstable list in the manifest is changing as the repair is triggered:

{panel}
Exception in thread "main" java.util.ConcurrentModificationException 
 at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
 at java.util.AbstractList$Itr.next(Unknown Source)
 at org.apache.cassandra.io.sstable.SSTable.getTotalBytes(SSTable.java:250)
 at org.apache.cassandra.db.compaction.LeveledManifest.getEstimatedTasks(LeveledManifest.java:435)
 at org.apache.cassandra.db.compaction.LeveledCompactionStrategy.getEstimatedRemainingTasks(LeveledCompactionStrategy.java:128)
 at org.apache.cassandra.db.compaction.CompactionManager.getPendingTasks(CompactionManager.java:1063)
 at sun.reflect.GeneratedMethodAccessor73.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(Unknown Source)
 at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(Unknown Source)
 at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(Unknown Source)
 at com.sun.jmx.mbeanserver.PerInterface.getAttribute(Unknown Source)
 at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(Unknown Source)
 at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(Unknown Source)
 at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(Unknown Source)
 at javax.management.remote.rmi.RMIConnectionImpl.doOperation(Unknown Source)
 at javax.management.remote.rmi.RMIConnectionImpl.access$200(Unknown Source)
 at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(Unknown Source)
 at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(Unknown Source)
 at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(Unknown Source)
 at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
 at sun.rmi.transport.Transport$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Unknown Source)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
{panel}

maybe we could change the list to a copyOnArrayList? just a suggestion, haven't investigated
much yet:

{code:title=LeveledManifest.java}
generations[i] = new ArrayList<SSTableReader>();
{code}

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