[infinispan-issues] [JBoss JIRA] (ISPN-3997) Expired cache entries are not pruned from memory and store on access

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12944612#comment-12944612 ] 

Mircea Markus commented on ISPN-3997:
-------------------------------------

Indeed the entries from memory (or persistent store for that matter) are not purged, if expired, during access. What actually happens is that we do check in callers thread to make sure that the entry is expired or not before returning it to the user[1].

The documentation should rather read: "if the user gets an entry that has been expired but not purged by the eviction thread yet, then null will be returned to the user. Note that this doesn't remove the entry from the grid yet, but this would happen when the eviction thread kicks in" 

[1] e.g. in the [JdbcStringBasedCacheStore|https://github.com/mmarkus/infinispan/blob/master/persistence/jdbc/src/main/java/org/infinispan/persistence/jdbc/stringbased/JdbcStringBasedStore.java#L209-209 ]
                
> Expired cache entries are not pruned from memory and store on access
> --------------------------------------------------------------------
>
>                 Key: ISPN-3997
>                 URL: https://issues.jboss.org/browse/ISPN-3997
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Eviction
>    Affects Versions: 6.0.1.Final, 7.0.0.Alpha1
>         Environment: Remote HotRod access to infinispan-server
>            Reporter: Wolf-Dieter Fink
>            Assignee: Dan Berindei
>
> Due to the documentation expired entries are pruned by having a scheduler or if they are accessed after expiration.
> This will not be done if the key is access.
> In case of having no scheduler to prune the entries this might cause OutOfMemory issues.

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