[infinispan-issues] [JBoss JIRA] (ISPN-5021) Nodes that finish the rebalance later can see outdated values

[Dan Berindei (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-5021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Berindei reassigned ISPN-5021:
----------------------------------

    Assignee: Radim Vansa  (was: Pedro Ruivo)


> Nodes that finish the rebalance later can see outdated values
> -------------------------------------------------------------
>
>                 Key: ISPN-5021
>                 URL: https://issues.jboss.org/browse/ISPN-5021
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Core, State Transfer
>    Affects Versions: 7.0.2.Final
>            Reporter: Dan Berindei
>            Assignee: Radim Vansa
>            Priority: Critical
>              Labels: consistency, testsuite_stability
>             Fix For: 9.1.0.Final, 9.1.0.Alpha1
>
>
> Copied from [ISPN-4444|https://issues.jboss.org/browse/ISPN-4444?focusedCommentId=13022645#comment-13022645]
> If the CH_UPDATE command is delayed on the old owner, the new owners might update the key without the old owner knowing, and a locality check on the old owner won't help.
> I remember one thing that struck me when reading the Raft algorithm was that they install configuration changes symmetrically, in 3 phases. We might need to do the same for our rebalance:
> 1. T0: read_ch=old, write_ch=old
> 2. start a rebalance
> 3. T1: read_ch=old, write_ch=old+new
> 4. new owners have all the data
> 5. T2: read_ch=new, write_ch=old+new
> 6. remove old cache entries and ignore further writes
> 7. T3: read_ch=new, write_ch=new



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