Yes, I use OrderPreservngPartitioner, the token considers datacenter+ip
+function+timestamp+recordId+...
On Aug 7, 2010, at 10:36 PM, Jonathan Ellis wrote:
are you using OrderPreservingPartitioner then?
On Sat, Aug 7, 2010 at 10:32 PM, Zhong Li <z...@voxeo.com> wrote:
Here is just my personal experiences.
I recently use Cassandra to implement a system cross 5 datacenters.
Because
it is impossible to do it in SQL Database at low cost, Cassandra
helps.
Cassandra is all about indexing, there is no relationship
naturally, you
have to use indexing to keep all relationships. This is fine,
because you
can add new index when you want.
The big pain is the token. Only one token you can choose for a
node, all
system have to adopt same rule to create index. It is huge huge pain.
If Cassandra can implement token at CF level, it is much nature and
easy for
us to implement a system.
Best,
Zhong
On Aug 6, 2010, at 9:23 PM, Peter Harrison wrote:
On Sat, Aug 7, 2010 at 6:00 AM, sonia gehlot
<sonia.geh...@gmail.com>
wrote:
Can you please help me how to move forward? How should I do all
the setup
for this?
My view is that Cassandra is fundamentally different from SQL
databases.
There
may be artefact's which are superficially similar between the two
systems,
but
I guess I'm thinking of a move to Cassandra like my move from
dBase to
Delphi;
in other words there were concepts which modified how you write
applications.
Now, you can do something similar to a SQL database, but I don't
think you
would
be leveraging the features of Cassandra. That said, I think there
will be
a new
generation of abstraction tools that will make modeling easier.
A perhaps more practical answer: there is no one to one mapping
between
SQL
and Cassandra.
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
