[infinispan-issues] [JBoss JIRA] (ISPN-4900) Split-brain: cancelled ST results in missing data

[Dan Berindei (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-4900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Berindei updated ISPN-4900:
-------------------------------
              Status: Pull Request Sent  (was: Open)
    Git Pull Request: https://github.com/infinispan/infinispan/pull/3041


In the end, I decided to cancel the rebalance when entering degraded mode.

> Split-brain: cancelled ST results in missing data
> -------------------------------------------------
>
>                 Key: ISPN-4900
>                 URL: https://issues.jboss.org/browse/ISPN-4900
>             Project: Infinispan
>          Issue Type: Bug
>          Components: State Transfer
>            Reporter: Radim Vansa
>            Assignee: Dan Berindei
>            Priority: Critical
>         Attachments: log.txt
>
>
> 1. Cluster [A, B, C, D], in CH 1 segment X owned by [D, C]
> 2. Split brain [A, B], [C, D]: A and B detects that D is missing, therefore they get view [A, B, C] and start rebalancing, in CH 2 segment X is owned by [C, B]
> 3. A and B get new view [A, B] (C is missing) and state transfer of X is cancelled, nodes enter degraded mode.
> 4. Split brain is fixed, all nodes find each other and merge - B starts to be AVAILABLE, but still does not have data for X
> 5. Subsequent requests on B return null upon cache.get()



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