[
https://issues.apache.org/jira/browse/CASSANDRA-5173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jonathan Ellis resolved CASSANDRA-5173.
---------------------------------------
Resolution: Won't Fix
We went in the direction of Triggers instead.
> Provide a mechanism to notify listeners when a mutation has occurred (or
> certain types of mutations have happened)
> ------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-5173
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5173
> Project: Cassandra
> Issue Type: Improvement
> Reporter: B. Todd Burruss
> Priority: Minor
>
> This is related to CASSANDRA-1311 but much less complicated. I have had the
> desire in the past where my application needed to react to mutations on
> Cassandra that have come from other DCs. Essentially using Cassandra as the
> storage system of record, but also using its replication as a "bus".
> An example of a straightforward use case is a read through caching system
> that can be more intelligent about its data than Cassandra's built in caching
> - providing better performance. One caching system per DC. The DC to DC
> replication in Cassandra is nice to keep data in sync, but the external
> caching system must know when a mutation comes from another DC and mark its
> data as dirty - or do whatever. Combine these notifications with TTLs on the
> cache and you have a fairly robust external caching integration with
> Cassandra!
> To get this integration, the external cache would register a "listener" (in
> the same JVM as Cassandra) for the types of mutations it is interested in,
> and receive an event when the conditions are met. after that it is the job
> of the listener to do what it needs.
> I created a patch on 1.1.4, but then the business decided on another
> direction. If this is still interesting to the community I can rebase to 1.2
> and post the patch, but my use case has since passed and I will probably not
> have time to maintain it.
--
This message was sent by Atlassian JIRA
(v6.1#6144)
