[infinispan-issues] [JBoss JIRA] (ISPN-2974) DeltaAware based fine-grained replication corrupts cache data, if eviction is enabled

[Horia Chiorean (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763693#comment-12763693 ] 

Horia Chiorean commented on ISPN-2974:
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Marking as critical, because ModeShape relies on partial delta updates.
                
> DeltaAware based fine-grained replication corrupts cache data, if eviction is enabled
> -------------------------------------------------------------------------------------
>
>                 Key: ISPN-2974
>                 URL: https://issues.jboss.org/browse/ISPN-2974
>             Project: Infinispan
>          Issue Type: Bug
>    Affects Versions: 5.2.1.Final, 5.2.5.Final
>            Reporter: Horia Chiorean
>            Assignee: Mircea Markus
>            Priority: Critical
>
> When using a custom {{DeltaAware}} implementation in a cluster with 2 replicated nodes with eviction enabled, data transferred from one node (the writer) to the another (the reader) causes data stored on this node but evicted at the time of the change, to be rewritten with whatever the partial latest delta was. 
> In more detail:
> * configure 2 nodes in replicated mode, with eviction enabled
> * consider NodeA the writer and NodeB the reader
> * NodeA inserts some data (custom entries) into the cache
> * NodeB correctly receives via state transfer the initial data
> * NodeA loads & partially updates some information about an entry which was not in the cache - was evicted previously
> * NodeB receives the partial delta with the changes from NodeA, but *instead of merging* with whatever is stored in the persistent store, *replaces the entire entry in the cache*, leaving it in effect with "partial/corrupt information"

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