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Date: Thu, 24 Nov 2011 17:53:43 +0000 (UTC)
From: "Edward Capriolo (Commented) (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-1311) Triggers
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    [ https://issues.apache.org/jira/browse/CASSANDRA-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156841#comment-13156841 ] 

Edward Capriolo commented on CASSANDRA-1311:
--------------------------------------------

I think 'crack triggers' sounds great for street cred. I like the approach of writing the trigger to disk. This would allow us to separate the logging of the action with the trigger action which I am guessing would be its stage. This seems like a good tradeoff, space to store the events, and a background thread to replay the events. I am thinking this trigger CF would be ordered so we can replay triggers by time and page through them without too much disk cost.
                
> Triggers
> --------
>
>                 Key: CASSANDRA-1311
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1311
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Maxim Grinev
>             Fix For: 1.1
>
>         Attachments: HOWTO-PatchAndRunTriggerExample-update1.txt, HOWTO-PatchAndRunTriggerExample.txt, ImplementationDetails-update1.pdf, ImplementationDetails.pdf, trunk-967053.txt, trunk-984391-update1.txt, trunk-984391-update2.txt
>
>
> Asynchronous triggers is a basic mechanism to implement various use cases of asynchronous execution of application code at database side. For example to support indexes and materialized views, online analytics, push-based data propagation.
> Please find the motivation, triggers description and list of applications:
> http://maxgrinev.com/2010/07/23/extending-cassandra-with-asynchronous-triggers/
> An example of using triggers for indexing:
> http://maxgrinev.com/2010/07/23/managing-indexes-in-cassandra-using-async-triggers/
> Implementation details are attached.

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