cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Martin Hentschel (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-1311) Support (asynchronous) triggers
Date Sat, 21 Aug 2010 09:22:19 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-1311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Hentschel updated CASSANDRA-1311:
----------------------------------------

    Attachment: trunk-984391-update2.txt

I fixed the points Stu mentioned:

*  untangled findTriggers
*  using MD5 instead of Arrays.hashCode
*  storing dangling triggers in the System Table instead of Java collections

I want to note that these fixes have introduce some performance penalties.  In our benchmarks
we observed a performance loss of 22%.  According to Maxim who has discussed this point with
Stu at the summit, this is still fine.  The System Table provides additional durability guarantees
instead.

> 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: 0.8
>
>         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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message