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From Sylvain Lebresne <sylv...@yakaz.com>
Subject Re: Some questions about using Cassandra
Date Thu, 17 Jun 2010 07:45:50 GMT
On Thu, Jun 17, 2010 at 1:20 AM, Anthony Ikeda
<Anthony.Ikeda@cardlink.com.au> wrote:
> Thanks Gary, I’m looking at that plug-in feature at the moment but there
> seems to be very little documentation on how to use it.

There is no documentation whatsoever. This is just a feature proposition right
now (it's not included in Cassandra, at least not yet), so it's not a
all encouraged to use it
unless of course it's to test it and give feedback to the patch author
(which I can only
encourage you to do :)). But right now you'll have to do it on the
application side.

> From the Application point of view though we are still trying to model the
> process flows based on our technological approach. Mainly due to the fact
> that we need real time processing at the application layer over 2 or more
> sites at least 1000km apart and we are finding RDBMS to be too slow for the
> volumes we are trying to achieve.
>
>
>
> We want to move any relational database access off the application and have,
> for example, Cassandra transferring whatever information to an underlying
> database/LDAP/FileSystem once we reach a final commit point – ultimately
> Cassandra being a distributed database it’s going to be used more for a
> cache or our database. As I said this process depends on which sync protocol
> we decide on (messaging, clustering, cloud, etc).
>
>
>
> Anthony
>
>
>
>
>
> From: Gary Dusbabek [mailto:gdusbabek@gmail.com]
> Sent: Thursday, 17 June 2010 2:20 AM
>
> To: user@cassandra.apache.org
> Subject: Re: Some questions about using Cassandra
>
>
>
> On Tue, Jun 15, 2010 at 19:49, Anthony Ikeda <Anthony.Ikeda@cardlink.com.au>
> wrote:
>
> Is there any concept of Listeners such that when data is added to Cassandra
> we can fire off another process to do something with that data? E.g. create
> a copy in a secondary database for Business Intelligence reports? Send the
> data to an LDAP server?
>
>  Typically, this is the kind of thing that gets handled at the application
> level (your application).  There is a feature request for it though.
>  https://issues.apache.org/jira/browse/CASSANDRA-1016
>
>
>
> Gary.
>
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