[infinispan-issues] [JBoss JIRA] (ISPN-2990) L1ManagerImpl doesn't reliably invalidate with async caches

[Sebastian Tusk (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788228#comment-12788228 ] 

Sebastian Tusk commented on ISPN-2990:
--------------------------------------

"For async caches the user should expect inconstancies by their nature"
While short-lived inconsistencies would be expected with async caches I find persisting divergences surprising. With long timeouts or regular access to the data the cache returns wrong values indefinitely.
                
> L1ManagerImpl doesn't reliably invalidate with async caches
> -----------------------------------------------------------
>
>                 Key: ISPN-2990
>                 URL: https://issues.jboss.org/browse/ISPN-2990
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Distributed Cache
>    Affects Versions: 5.2.1.Final
>            Reporter: Sebastian Tusk
>            Assignee: William Burns
>            Priority: Minor
>              Labels: onboard
>             Fix For: 6.0.0.Final
>
>
> B is owner of k,v1
> A has k,v1 in L1
> 1. TX: A puts k,v2
> 2. TX: A sends async PrepareCommand k,v2 to B (one-phase-commit)
> 3. TX: A removes k,v1 from L1
> 4. A putForExternalRead k,v1 and has it in L1 again
> 5. TX: B executes PrepareCommand k,v2 but doesn't send invalidation to origin
> Result: A has k,v1 and B has k,v2
> Solution: For async caches send invalidation to origin too.
> The problem is that the owner updates the cache entry asynchronously. This gives the origin of the transaction time to request the entry. Here an outdated version is received and placed in L1. The owner never invalidates the entry and as result the cache is inconsistent.

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