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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2921) Replication: Add a network service that connects the master and slave Derby instances
Date Fri, 03 Aug 2007 20:51:53 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517632
] 

Rick Hillegas commented on DERBY-2921:
--------------------------------------

Thanks for the patch, Naryanan. I have an initial question about ReplicationMessage. It appears
to implement Serializable. That means that the exchange protocol relies on both ends of the
connection being at the same rev level of Derby and perhaps even compiled by the same machine.
I'm not sure this is what you want, particularly since the architecture allows for large webs
of Derby nodes, each of which may host both slaves and masters. I think that the functional
spec should address the topic of version agreement between nodes. For instance, do you envision
that newly upgraded masters will propagate the new Derby rev to their slaves?

> Replication: Add a network service that connects the master and slave Derby instances
> -------------------------------------------------------------------------------------
>
>                 Key: DERBY-2921
>                 URL: https://issues.apache.org/jira/browse/DERBY-2921
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Services
>    Affects Versions: 10.4.0.0
>            Reporter: Jørgen Løland
>            Assignee: V.Narayanan
>         Attachments: Replication_Network_v1.diff, Replication_Network_v1.stat
>
>
> A network connection is required between the master and slave Derby instances of a replicated
database. The connection will be used to send many kinds of messages, including:
> * log records
> * the database (when replication is started)
> * master -> slave commands (like "stop replication")

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