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https://issues.apache.org/jira/browse/CASSANDRA-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495247#comment-13495247
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Nate McCall edited comment on CASSANDRA-1311 at 11/12/12 1:31 PM:
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bq. Currently there is a JMX to load the new jars and we also watch triggers
directory every minute to looking for new JAR's, I am inclined to removing the
watch part for safety and let the user call the JMX to reload the jar's.
In the use cases I see for this, a timer would not give me enough control in
orchestrating an update to the trigger code. I would much prefer JMX - could be
more easily hooked into nodetool for all at once as well.
(Edit) thought about this update orchestration for a minute, created
CASSANDRA-4949 for using nodetool for such.
was (Author: zznate):
bq. Currently there is a JMX to load the new jars and we also watch
triggers directory every minute to looking for new JAR's, I am inclined to
removing the watch part for safety and let the user call the JMX to reload the
jar's.
In the use cases I see for this, a timer would not give me enough control in
orchestrating an update to the trigger code. I would much prefer JMX - could be
more easily hooked into nodetool for all at once as well.
> 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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