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List:       cassandra-dev
Subject:    Re: plugins/triggers/coprocessors
From:       Jeremy Hanna <jeremy.hanna1234 () gmail ! com>
Date:       2011-02-16 15:25:43
Message-ID: A1615589-6D2C-4D10-AE51-353A4765C4AD () gmail ! com
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Just wanted to let people who follow the user list know that if there is interest in \
something like plugins, triggers, or coprocessors on the server-side with Cassandra, \
the ticket to follow or get involved with (code, comments, etc) is CASSANDRA-1311: \
https://issues.apache.org/jira/browse/CASSANDRA-1311

On Feb 11, 2011, at 1:31 PM, Jeremy Hanna wrote:

> So from here I guess it's a matter of working out the comments/concerns presented \
> on 1311 and any future discussion sounds like it belongs there. 
> Like I said, I just wanted to initiate discussion since it had been a while and the \
> dust from 0.7 had settled.  It seems like an incredibly useful concept to have as a \
> core feature.  Another motivation was Ben Black presenting at Strata.  He had \
> mentioned that he and Cliff had worked through doing server side operations which \
> sounded similar (though their effort sounded like it was not generalizable).  I've \
> talked to others in the community that have hoped for a feature like this too.  In \
> any case, since it crossed ticket boundaries, I thought it would be most \
> appropriate to gauge interest as a discussion thread. 
> Hopefully this will help for people who would like to either help out with \
> implementation or give feedback as to how it can be made general purpose or more \
> Cassandra-y. 
> On Feb 11, 2011, at 1:11 PM, Jeff Hodges wrote:
> 
> > As the dude that worked on the 1016 prototype, I agree with this.
> > 
> > On Fri, Feb 11, 2011 at 10:53 AM, Stu Hood <stuhood@gmail.com> wrote:
> > > Honestly, I think we should just mark 1016 a dupe and move forward with
> > > 1311: we won't be hurting anyone's feelings, and the implementation from
> > > 1016 is: 1. much, much less complete, 2. abandoned.
> > > 
> > > 
> > > On Fri, Feb 11, 2011 at 9:23 AM, Jeremy Hanna \
> > > <jeremy.hanna1234@gmail.com>wrote: 
> > > > Thanks Maxim - I'll just go ahead and BCC you and Hentschel and move the
> > > > discussion to the dev list.
> > > > 
> > > > Based on the comments on 1311 - did you have anything else to add to that -
> > > > could we unify around 1016 or 1311 and work on getting that to a general
> > > > state of acceptance?  Were there any that were able to do some work on
> > > > either these days?  Or are we not at that point?
> > > > 
> > > > On Feb 11, 2011, at 10:36 AM, Maxim Grinev wrote:
> > > > 
> > > > > Hi all,
> > > > > 
> > > > > Jeremy, thanks for starting the discussion! We don't follow the dev list
> > > > closely so it was a good idea to email it directly.
> > > > > 
> > > > > It really seems to be about the same. To unify the discussions, we
> > > > propose to list the features of each solution and compare them feature by
> > > > feature. Here is the feature list for triggers:
> > > > > • Triggers are set on a column family. Triggers are executed for
> > > > each mutation to the column family and parametrized by the mutation.
> > > > > • The mutation, which is the trigger parameter, is the "new" value.
> > > > The trigger cannot see the "old" value.
> > > > > • Triggers are executed asynchronously some time after the write
> > > > which fired it is acknowledged to the client.
> > > > > • Triggers are executed once during normal execution. We guarantee
> > > > "at least once" execution in case of node failures.
> > > > > Cheers,
> > > > > Maxim
> > > > > 
> > > > > 
> > > > > On Thu, Feb 10, 2011 at 8:45 AM, Jeremy Hanna
> > > > > <jeremy.hanna1234@gmail.com> wrote:
> > > > > > Hey guys,
> > > > > > 
> > > > > > I was just wondering if it would be a good time to unify discussions on
> > > > plugins/triggers/coprocessors?
> > > > > > 
> > > > > > https://issues.apache.org/jira/browse/CASSANDRA-1016
> > > > > > https://issues.apache.org/jira/browse/CASSANDRA-1311
> > > > > > 
> > > > > > I was going to email the dev list but since I don't know if all of you
> > > > follow the dev list and you guys are the ones that expressed the most
> > > > interest, I thought I would start here.
> > > > > 
> > > > > Yeah, they're all tackling basically the same problem. For which we
> > > > > should have a single solution.
> > > > > 
> > > > > -ryan
> > > > > 
> > > > 
> > > > 
> > > 
> 


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