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