Michael I will check that out
Thanks On Fri, Sep 25, 2009 at 10:35 AM, Michael Greene <[email protected]>wrote: > Additionally, Cassandra client connections and the Thrift API are not > designed to be stateful. For what it's worth, Apache Zookeeper offers such > change notifications, but has a very different architecture. > Michael > > > On Fri, Sep 25, 2009 at 12:25 PM, Jonathan Ellis <[email protected]>wrote: > >> That's a bad fit for Cassandra, since the machine any given client >> talks to is unlikely to be the machine that data got sent to. So >> you'd have to send the notifications from >> >> Client1 -> cassandra1 -> cassandra data node -> cassandra2 -> client 2 >> >> It would complicate things significantly. >> >> -Jonathan >> >> On Fri, Sep 25, 2009 at 12:21 PM, Hector Yuen <[email protected]> >> wrote: >> > Michael, >> > >> > What I want to do is to use a column as a place for keeping state >> between >> > different clients. >> > >> > I would register callbacks for a column, so when there is any other guy >> > changing the data I can get notified. That way I don't need to do >> continuous >> > polling. >> > >> > Is there any functionality right now that I could use to implement this? >> > >> > Thanks >> > -h >> > >> > On Fri, Sep 25, 2009 at 7:59 AM, Michael Greene < >> [email protected]> >> > wrote: >> >> >> >> Hector, >> >> Can you describe explicitly what you'd want to see from >> callouts/triggers? >> >> One of the reasons I advocated for removal is that no one had a need >> for it >> >> or was working on it in the open source project. What's your scenario? >> >> Michael >> >> >> >> On Fri, Sep 25, 2009 at 9:40 AM, Eric Evans <[email protected]> >> wrote: >> >>> >> >>> On Fri, 2009-09-25 at 02:17 -0700, Hector Yuen wrote: >> >>> > I am just starting to use Cassandra, and I was wondering if it is >> >>> > possible >> >>> > to use triggers/ callbacks on columns so that they get notified when >> >>> > there >> >>> > is a change. >> >>> > >> >>> > Is there such functionality? >> >>> >> >>> No, there isn't. Someone was working on this at some point, but it >> >>> wasn't going anywhere so it got removed >> >>> (http://svn.apache.org/viewvc?view=rev&revision=806267). >> >>> >> >>> -- >> >>> Eric Evans >> >>> [email protected] >> >>> >> >> >> > >> > >> > >> > -- >> > -h >> > >> > > -- -h
