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https://issues.apache.org/jira/browse/CASSANDRA-4954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496360#comment-13496360
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Edward Capriolo commented on CASSANDRA-4954:
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One way to handle the dynamic bits are "add trigger [source] [sourcespec]"
source spec could be "jar" in which case the source could be "jar:///a/b/c.jar
or "http://server/a.jar";
source spec could be "groovy" in which case the source is actually an embedded
class "class triggerhandler { handleTrigger(event){} }"
...scala...
...clojure...
etc
> Store trigger jar file dependencies in system keyspace
> ------------------------------------------------------
>
> Key: CASSANDRA-4954
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4954
> 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
> ([https://issues.apache.org/jira/browse/CASSANDRA-1311])
> 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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