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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4684) Binary protocol: inform clients of schema changes
Date Tue, 02 Oct 2012 17:13:07 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467872#comment-13467872
] 

Sylvain Lebresne commented on CASSANDRA-4684:
---------------------------------------------

I'll add that it's not a very disruptive email, so unless we're convince this is useless (as
said above, I'm convinced of the contrary), I don't think we're taking much risk at supporting
it.
                
> Binary protocol: inform clients of schema changes
> -------------------------------------------------
>
>                 Key: CASSANDRA-4684
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4684
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 1.2.0 beta 1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 1.2.0 beta 2
>
>         Attachments: 0001-Return-schema-change-infos.txt, 0002-Add-migration-events.txt
>
>
> It would be nice to inform clients when a schema change occurs as this would allow said
client to maintain the current state of the schema, which might be useful/desirable. To allow
that, we can:
> # return that a query has changed the schema (instead of simply a 'void' return), in
the same spirit than CASSANDRA-3707.
> # add events notification on schema change.
> Just to be clear, the goal is only to inform that a change has occured, the client would
still have to query the system table to know the exact content of the change, but at least
it'll know when to do such query.

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