[infinispan-issues] [JBoss JIRA] (ISPN-5334) Define a policy for cluster merge if partition handling is enabled and the availability is changed by an admin

[Wolf-Dieter Fink (JIRA)]

Wolf-Dieter Fink created ISPN-5334:
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             Summary: Define a policy for cluster merge if partition handling is enabled and the availability is changed by an admin
                 Key: ISPN-5334
                 URL: https://issues.jboss.org/browse/ISPN-5334
             Project: Infinispan
          Issue Type: Enhancement
          Components: Core
         Environment: Clustered caches with Partition Handling enabled
            Reporter: Wolf-Dieter Fink


If there is no user intervention during a cluster split with enabled partition handling there is NO available partition or ONE. It is not possible in this case to have >1 available partitions.
Because of that there is no handling defined for this. As a result the cluster is in an undifined and maybe inconsistent state after merge.

There should be a definition how this situation will be resolved!

- First a manual intervention should be logged in a different way to document it, at the moment the log message is the same no matter whether the state changed by hand or not.
- If there is a majority of nodes (from last stable) this partition should stay active and the other (available) should be erased in the same way as the degraded one.
- If there is a simple majority this should be used
- If there is no majorty ... random?
- In any case a merge of avail-avail should be log a WARN (maybe on each node)

In any case there should be a documented policy to be sure what the ramifications are if there is a manual intervention for the available state. 



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