[jbosscache-issues] [JBoss JIRA] Updated: (JBCACHE-1555) Mvcc node peek could contain stale data

[Galder Zamarreno (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBCACHE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Galder Zamarreno updated JBCACHE-1555:
--------------------------------------

    Priority: Critical  (was: Major)


> Mvcc node peek could contain stale data
> ---------------------------------------
>
>                 Key: JBCACHE-1555
>                 URL: https://jira.jboss.org/jira/browse/JBCACHE-1555
>             Project: JBoss Cache
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Locking
>    Affects Versions: 3.2.1.GA
>            Reporter: Galder Zamarreno
>            Assignee: Manik Surtani
>            Priority: Critical
>             Fix For: 3.3.0.GA
>
>         Attachments: Chtimi2Test.java, jbosscache.log, logging-changes.txt
>
>
> I've added some extra logging to the attached test case to find out where the problem is:
> 2009-11-06 19:37:52,762 1064  DEBUG [org.jboss.cache.mvcc.MVCCNodeHelper] (pool-1-thread-1:) Peek internal node for fqn /foo/mynode
> 2009-11-06 19:37:52,763 1065  DEBUG [org.jboss.cache.mvcc.MVCCNodeHelper] (pool-1-thread-1:) Peek returned UnversionedNode[ /foo/mynode data=[scalar]]@14e45b3
> 2009-11-06 19:37:52,763 1065  TRACE [org.jboss.cache.lock.MVCCLockManager] (pool-1-thread-1:) Attempting to lock /foo/mynode
> ...
> 2009-11-06 19:37:52,763 1065  TRACE [org.jboss.cache.commands.write.PutKeyValueCommand] (pool-1-thread-1:) Perform('GlobalTransaction:<null>:3', '/foo/mynode', k='_lockthisplease_', v='_lockthisplease_')
> ...
> 2009-11-06 19:37:52,767 1069  DEBUG [org.jboss.cache.mvcc.MVCCNodeHelper] (pool-1-thread-5:) Peek internal node for fqn /foo/mynode
> 2009-11-06 19:37:52,767 1069  DEBUG [org.jboss.cache.mvcc.MVCCNodeHelper] (pool-1-thread-5:) Peek returned UnversionedNode[ /foo/mynode data=[scalar]]@14e45b3
> 2009-11-06 19:37:52,767 1069  TRACE [org.jboss.cache.lock.MVCCLockManager] (pool-1-thread-5:) Attempting to lock /foo/mynode
> ...
> 2009-11-06 19:37:52,774 1076  TRACE [org.jboss.cache.lock.MVCCLockManager] (pool-1-thread-1:) Attempting to unlock /foo/mynode
> ...
> 2009-11-06 19:37:52,777 1079  DEBUG [org.jboss.cache.mvcc.RepeatableReadNode] (pool-1-thread-5:) underlyingNode is UnversionedNode[ /foo/mynode data=[scalar, _lockthisplease_]]@fa39d7
> 2009-11-06 19:37:52,777 1079  DEBUG [org.jboss.cache.mvcc.RepeatableReadNode] (pool-1-thread-5:) node is UnversionedNode[ /foo/mynode data=[scalar]]@14e45b3
> 2009-11-06 19:37:52,778 1080  WARN  [org.jboss.cache.mvcc.RepeatableReadNode] (pool-1-thread-5:) Detected write skew on Fqn [/foo/mynode].  Another process has changed the node since we last read it!.  Unable to copy node for update.
> pool-1-thread-5 has peeked too early! it was waiting for lock that pool-1-thread-1 one and carried with old data. In the mean time, pool-1-thread-1 wrote the data and unlocked which allowed pool-1-thread-5 to continue but it had cached data that is now stale.

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