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From "Martin Hentschel (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1311) Support (asynchronous) triggers
Date Wed, 11 Aug 2010 14:20:19 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Hentschel updated CASSANDRA-1311:
----------------------------------------

    Attachment: trunk-984391-update1.txt
                ImplementationDetails-update1.pdf
                HOWTO-PatchAndRunTriggerExample-update1.txt

Uploaded a new patch, improvements to the last release:

* Updated to Cassandra revision 984391
* Reduced network traffic of notification messages (by bundling of notifications and sending
only hash values)
* Faster storage of "dangling" triggers at a slave node (using Java collections instead of
Cassandra system tables because we don't need additional durability guarantees)

> Support (asynchronous) triggers
> -------------------------------
>
>                 Key: CASSANDRA-1311
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1311
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Contrib
>            Reporter: Maxim Grinev
>             Fix For: 0.8
>
>         Attachments: HOWTO-PatchAndRunTriggerExample-update1.txt, HOWTO-PatchAndRunTriggerExample.txt,
ImplementationDetails-update1.pdf, ImplementationDetails.pdf, trunk-967053.txt, trunk-984391-update1.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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