[infinispan-issues] [JBoss JIRA] Created: (ISPN-493) Harden rehash leave process

Thu Jun 10 12:00:31 EDT 2010

Harden rehash leave process
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                 Key: ISPN-493
                 URL: https://jira.jboss.org/browse/ISPN-493
             Project: Infinispan
          Issue Type: Task
    Affects Versions: 4.1.0.BETA2, 4.0.0.Final
            Reporter: Vladimir Blagojevic
            Assignee: Vladimir Blagojevic
             Fix For: 5.0.0.BETA1, 5.0.0.Final

We need to make sure that leave rehash process properly handles massive and rapid node failure. 

Massive failures:
JGroups detects multiple node failures and pushes up to Infinispan views that are more "volatile" than we currently assumed (only one member at the time can leave). For example, if we have view V1={A,B,C,D,E} and massive failure causes {C,D,E} to fail, JGroups failure detection and GMS are going to install a view V2={A,B} to surviving members. LeaveTask does not handle this scenario.

Rapid node failure:
We need to revisit how LeaveTasks are queued up and executed/canceled during rapid node failures. Do we always cancel currently running leave tasks? At what stage are we allowed to cancel it and at what stage of a leave tasks is it better to wait for a completion of a task. 

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