[infinispan-issues] [JBoss JIRA] (ISPN-2578) Two PrepareCommands in parallel cause ConcurrentModificationException

[RH Bugzilla Integration (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749497#comment-12749497 ] 

RH Bugzilla Integration commented on ISPN-2578:
-----------------------------------------------

Radim Vansa <rvansa at redhat.com> changed the Status of [bug 882990|https://bugzilla.redhat.com/show_bug.cgi?id=882990] from ON_QA to VERIFIED
                
> Two PrepareCommands in parallel cause ConcurrentModificationException
> ---------------------------------------------------------------------
>
>                 Key: ISPN-2578
>                 URL: https://issues.jboss.org/browse/ISPN-2578
>             Project: Infinispan
>          Issue Type: Bug
>    Affects Versions: 5.2.0.Beta5
>            Reporter: Radim Vansa
>            Assignee: Mircea Markus
>            Priority: Blocker
>             Fix For: 5.2.0.CR2
>
>
> Situation:
> 1) Node A broadcasts PrepareCommand to nodes B, C
> 2) Node A leaves cluster, causing new topology to be installed
> 3) The command arrives to B and C, with lower topology than the current one
> 4) Both B and C forward the command to node D
> 5) D executes the two commands in parallel and finds out that A has left, therefore executing RollbackCommand
> In {{AbstractTxLockingInterceptor.visitRollbackCommand}} we call {{LockManagerImpl.unlockAll}} which iterates over the keys and unlocks them. As these two prepares aren't synchronized over the {{lockedKeys}} set, one may unlock and remove these keys while the other is iterating through them, causing {{ConcurrentModificationException}}.

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