Created attachment 741897 [details]
engine log

Description of problem:
ConcurrentModificationException while trying move host to maintenance mode when there is a problem accessing storage domains.


I have two hosts connected to Storage Domain.
Blocked connection from both hotsts to Storage Domain.
One host became Non-Operational ,the second stays active. (No SPM)
When tried to move Non-Operation host to Maintenance got the exception.

How reproducible:
100%

Steps to Reproduce:
1.Have two hosts connected to SD. Block connectivity from hosts to SD.
2.Move host from Non-Operational to Maintenance.

  
Actual results:
Host doesn't move to maintenance.

Expected results:
host moves to maintenance.

2013-04-30 17:06:07,794 ERROR [org.ovirt.engine.core.bll.eventqueue.EventQueueMonitor] (pool-3-thread-46) [3b43d477] Exception during process of events for pool 60fa83ee-3b30-481a-bf62-8196ba8da6e3, error is java.util.ConcurrentModificat
ionException
2013-04-30 17:06:07,794 ERROR [org.ovirt.engine.core.bll.eventqueue.EventQueueMonitor] (QuartzScheduler_Worker-7) [3b43d477] Failed at submitEventSync, for pool 60fa83ee-3b30-481a-bf62-8196ba8da6e3 with exception java.util.concurrent.Exe
cutionException: java.util.ConcurrentModificationException: java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
        at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252) [rt.jar:1.7.0_09-icedtea]
        at java.util.concurrent.FutureTask.get(FutureTask.java:111) [rt.jar:1.7.0_09-icedtea]
        at org.ovirt.engine.core.bll.eventqueue.EventQueueMonitor.submitEventSync(EventQueueMonitor.java:54) [engine-bll.jar:]
        at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source) [:1.7.0_09-icedtea]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_09-icedtea]
        at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0_09-icedtea]
        at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36) [jboss-as-ee.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) [jboss-as-ee.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx(CMTTxInterceptor.java:209) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.supports(CMTTxInterceptor.java:361) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:192) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:42) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) [jboss-as-ejb3.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) [jboss-as-ee.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45) [jboss-as-ee.jar:7.1.3.Final-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation.jar:1.1.1.Final-redhat-2]
        at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:165) [jboss-as-ee.jar:7.1.3.Final-redhat-4]
        at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:181) [jboss-as-ee.jar:7.1.3.Final-redhat-4]