[jboss-jira] [JBoss JIRA] Commented: (JBMESSAGING-1340) Session replication

[Tim Fox (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBMESSAGING-1340?page=comments#action_12414428 ] 
            
Tim Fox commented on JBMESSAGING-1340:
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We have to consider how this will work when running inside JBoss AS instances - maybe we start two messaging nodes (one backup and one live) on each JBoss AS node

> Session replication
> -------------------
>
>                 Key: JBMESSAGING-1340
>                 URL: http://jira.jboss.com/jira/browse/JBMESSAGING-1340
>             Project: JBoss Messaging
>          Issue Type: Task
>            Reporter: Tim Fox
>         Assigned To: Tim Fox
>            Priority: Critical
>             Fix For: 2.0.0 Beta
>
>
> Implement replication of sessions between live and backup.
> It will be possible to replicate sessions to a backup node. Each node will be twinned with a backup. The nodes backup will be configured in the live nodes jbm-configuration.xml. When a node is started it will not become active until its backup is started.
> If a node fails, failover will occur on to the backup. It will then be possible to promote the back to a live node, and bring up another backup without downtime.
> The replication needs to happen in memory synchronously.
> Write to journal on both nodes can be lazy (asynchronous) since on failover we can be sure it is in memory on backup so no single point of failover.
> But can persist to disk asynchronously?? I think we can persist to disk asynchrnously on the master node, but needs to be synchronous on the backup node, in case we get a failure of the backup too shortly after failure of the master.
> If we can tolerate duplicate messages (or messages thought sent but not store) in a double failure then can do asynchronous storage on both master and slave.

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