[infinispan-issues] [JBoss JIRA] (ISPN-3048) Eviction needs to be transactional

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926461#comment-12926461 ] 

Dan Berindei commented on ISPN-3048:
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[~pferraro] I agree with Pedro, eviction should not be transactional. If you have a test that fails with size-based eviction, please attach it here. Note that by enabling size-based eviction without passivation, you agree that your data can be lost at any time, and if your isolation level is READ_COMMITTED, even ongoing transactions can see the entry as removed.

[~pruivo] I don't think this is related to ISPN-3694, Paul's problem is with size-based eviction, and the problem Will found is only with manual eviction.
                
> Eviction needs to be transactional
> ----------------------------------
>
>                 Key: ISPN-3048
>                 URL: https://issues.jboss.org/browse/ISPN-3048
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Eviction
>    Affects Versions: 5.3.0.Alpha1
>            Reporter: Paul Ferraro
>            Assignee: Pedro Ruivo
>            Priority: Critical
>              Labels: 620
>             Fix For: 6.1.0.Final
>
>
> Currently, Infinispan eviction is non-transactional.  This makes Infinispan's eviction manager virtually unusable, since non-transactional eviction can cause phantom reads and data loss because it violates the isolation of concurrent transactions.  This is especially problematic when using a passivation-enabled cache store.  In this case, a cache eviction/passivation can cause a concurrently executed cache retrieval to return null - even though the act of passivation does not change the data - it only changes where it is stored.
> We work around this in the AS by performing eviction manually, using pessimistic locking in combination with eager lock acquisition prior to eviction.  This is unfortunate, since it prevents me from leveraging Infinispan's build-in eviction strategies.

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