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T Jake Luciani commented on CASSANDRA-1311:
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Hi Martin,
I'm interested in learning more about your new approach. I think the concerns
over the current approach are summed up by:
bq. This sounds really, really fragile. Grafting a pseudo-master onto Cassandra
replication is a bad idea.
I think for version 1 of triggers we need to go with the simplest approach. I
believe this is to make the triggers synchronous and run RF times. Another
possibility is to make the coordinator node responsible for running/delegating
the trigger before acknowledging a successful write...
As we bake out new ideas we can look at improving this, but I do think a simple
trigger mechanism is needed for 1.0.
> 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: 1.0
>
> 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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