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From "Tupshin Harper (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4954) Store trigger jar file dependencies in system keyspace
Date Tue, 13 Nov 2012 17:20:12 GMT


Tupshin Harper commented on CASSANDRA-4954:

I envision a custom classloader that can read directly from a cf, and a "nodetool deploy trigger
<jar>" command
As well as "nodetool [de]activate trigger" and
"nodetool configure trigger <triggername> [paramlist]"
Or some such. Each of these could also be performed by modifying the triggers cf directly
if desired.

Enhancements could include deploying uncompiled jvm scripts in groovy, scala, etc with the
same approach.
> Store trigger jar file dependencies in system keyspace
> ------------------------------------------------------
>                 Key: CASSANDRA-4954
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Patrick McFadin
>             Fix For: 1.3
> The implementation of triggers requires the use of jar files to be stored in the local
filesystem, per node. See ([]) 
> I'm proposing that instead of using the filesystem, jars would be stored in the system
keyspace. This would greatly reduce the operational complexity of implementing triggers on
multiple node clusters. Some benefits would include:
> * Triggers and dependencies would be part of a snapshot for backup and restore
> * Every node would have a consistent version
> * Everything needed for the trigger would be a part of bootstrap
> Some details to start the conversation:
> * Have a list of jars for each trigger be made available via JMX
> * Expose the jar upload using CQL when trigger is created (USING FILE x) 
> * Store the version number or date for each jar
> * Implement a classloader trigger when jars are updated
> * Provide some sort of guarantee that triggers aren't active until all nodes have the
same version of jar(s)

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