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From "Ahmet AKYOL (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1311) Triggers
Date Tue, 13 Nov 2012 17:08:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496333#comment-13496333
] 

Ahmet AKYOL commented on CASSANDRA-1311:
----------------------------------------

How about stored procedures? Triggers can't be without them :) Indeed, I don't believe they
are a good fit in C*'s distributed nature( even triggers ??). I think, the magic words here
are once again "eventually-consistent".

Anyway, IMHO, Redis's scripting is also a way to go, maybe a parallel way only as stored procedures.
Redis(2.6.x) has a built-in Lua interpreter, C* can use Rhino. Redis's [eval|http://redis.io/commands/eval],
[evalsha|http://redis.io/commands/evalsha] and [script load|http://redis.io/commands/script-load]
commands can be used in CQL.

 You can also check [the little redis book|https://github.com/karlseguin/the-little-redis-book/blob/master/en/redis.md]
chapter 5.
                
> Triggers
> --------
>
>                 Key: CASSANDRA-1311
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1311
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Maxim Grinev
>            Assignee: Vijay
>             Fix For: 1.3
>
>         Attachments: HOWTO-PatchAndRunTriggerExample.txt, HOWTO-PatchAndRunTriggerExample-update1.txt,
ImplementationDetails.pdf, ImplementationDetails-update1.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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