[infinispan-issues] [JBoss JIRA] (ISPN-4343) Rest rolling upgrades, distributed -- new cluster can't load from old cluster properly

[Pedro Ruivo (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-4343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983438#comment-12983438 ] 

Pedro Ruivo commented on ISPN-4343:
-----------------------------------

IMO, I think the codec needs to change. I didn't try it yet, but my idea is to change the codec to put the data as key and put the data type in the MimeMetadata. then we can get rid of MimeCacheEntry.

> Rest rolling upgrades, distributed -- new cluster can't load from old cluster properly
> --------------------------------------------------------------------------------------
>
>                 Key: ISPN-4343
>                 URL: https://issues.jboss.org/browse/ISPN-4343
>             Project: Infinispan
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Loaders and Stores, Server
>    Affects Versions: 7.0.0.Alpha4
>            Reporter: Tomas Sykora
>            Assignee: Tomas Sykora
>            Priority: Critical
>              Labels: rolling_upgrade
>         Attachments: cannot_be_cast.txt, clustered-rest-rolling-upgrade.xml, clustered.xml, ISPN-4343.txt, ISPN-4343.zip, restRollUpsTraceLog.zip
>
>
> A try to mimic the process of REST Rolling Upgrades for one old and new server in a clustered environment failed.
> Scenario is quite simple, we start 2 old servers, store some data in, start 2 new servers and point clients to that new cluster.
> When issuing a get on a new cluster (want to fetch old entry from old store), the operation fails with attached stack trace.
> I also include current ISPN testsuite where is added testRestRollingUpgradesDiffVersionsDist test as a reproducer.
> Respective changes are mirrored in my remote branch: https://github.com/tsykora/infinispan/tree/ISPN-4330
> You can run test like: 
> mvn clean verify -P suite.rolling.upgrades -Dzip.dist.old=/home/you/servers/previous-ispn-server-version.zip -Dtest=RestRollingUpgradesTest#testRestRollingUpgradesDiffVersionsDist



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