[infinispan-issues] [JBoss JIRA] (ISPN-4949) Split brain: inconsistent data after merge

[Radim Vansa (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-4949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radim Vansa updated ISPN-4949:
------------------------------
    Summary: Split brain: inconsistent data after merge  (was: Split brain: data updated in degraded mode)


> Split brain: inconsistent data after merge
> ------------------------------------------
>
>                 Key: ISPN-4949
>                 URL: https://issues.jboss.org/browse/ISPN-4949
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: State Transfer
>    Affects Versions: 7.0.0.Final
>            Reporter: Radim Vansa
>            Priority: Critical
>
> 1) cluster A, B, C, D splits into 2 parts:
> A, B (coord A) finds this out immediately and enters degraded mode with CH [A, B, C, D]
> C, D (coord D) first detects that B is lost, gets view A, C, D and starts rebalance with CH [A, C, D]. Segment X is primary owned by C (it had backup on B but this got lost)
> 2) D detects that A was lost as well, therefore enters degraded mode with CH [A, C, D]
> 3) C inserts entry into X: all owners (only C) is present, therefore the modification is allowed
> 4) cluster is merged and coordinator finds out that the oldest stable topology has CH [A, B, C, D] - logs 'No active or unavailable partitions, so all the partitions must be in degraded mode' (yes, all partitions are in degraded mode, but write has happened in the meantime)
> 5) The old CH is broadcast in newest topology, no rebalance happens
> 6) Inconsistency: read in X may miss the update



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