[infinispan-issues] [JBoss JIRA] (ISPN-3693) ActivationInterceptor on get always deletes store contents

[William Burns (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on ISPN-3693 started by William Burns.

> ActivationInterceptor on get always deletes store contents
> ----------------------------------------------------------
>
>                 Key: ISPN-3693
>                 URL: https://issues.jboss.org/browse/ISPN-3693
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Loaders and Stores
>    Affects Versions: 6.0.0.CR1
>            Reporter: William Burns
>            Assignee: William Burns
>            Priority: Blocker
>             Fix For: 6.0.0.CR2
>
>
> The activation interceptor when doing manual eviction always removes the entry from the loader on a get.  This is done even if the entry is in the data container.
> Now this is fine for a single invocation.  However if a concurrent evict command comes on a different thread you can get in a state where the data is neither in the dc or loader defeating the purpose of Passivation.
> The following describes this scenario
> {code}
> t1 -> calls get retrieves value from context (dc)
> t2 -> calls evict retrieves value from context (dc)
> t2 -> passivates entry (writes entry to loader)
> t1 -> activates entry (removes entry from loader)
> t2 -> removes entry from dc
> {code}
> Note this doesn't affect size based eviction.
> Also looking closer we need to fix the act of activation.  It can cause a window where no data is available between when the loader entry is removed and the data is committed to the data container.  This would especially be apparent with tx caches as the data container wouldn't be updated until the tx is completed where as the loader is removed on the get.

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