cassandra-client-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: How should clients handle the user defined types in 2.1?
Date Thu, 06 Mar 2014 13:58:34 GMT
its not a step backwards though the emphasis was to remove burden from the
client developers.  The value of a cassandra column could be 2GB but you
were limited by a thrift frame. Now with the native protocol you can now
throw huge objects in a column users can find new uses to use/break the
database. Before you had to break that up across columns.


On Thu, Mar 6, 2014 at 1:33 AM, Theo Hultberg <theo@iconara.net> wrote:

> I agree, it feels like a step backwards for the CQL protocol.
>
> T#
>
>
> On Wed, Mar 5, 2014 at 8:10 PM, Edward Capriolo <edlinuxguru@gmail.com
> >wrote:
>
> > Somewhat of an aside. But wasn't issues with client serialization issues
> > one of the reasons to get away from thrift? It seems like asking client
> > language to decode complex objects recreates the problem only with 1
> degree
> > more complexity.
> >
> >
> > On Wed, Mar 5, 2014 at 1:55 PM, Theo Hultberg <theo@iconara.net> wrote:
> >
> > > thanks! yeah, I meant user defined types, but thanks for the
> description
> > of
> > > general custom types too, it's good to know.
> > >
> > > T#
> > >
> > >
> > > On Tue, Mar 4, 2014 at 9:28 PM, Tyler Hobbs <tyler@datastax.com>
> wrote:
> > >
> > > > On Sat, Mar 1, 2014 at 5:01 AM, Theo Hultberg <theo@iconara.net>
> > wrote:
> > > >
> > > > > Mikhail, thanks, but I meant the reverse of that. Say the user
> > creates
> > > a
> > > > > prepared statement where one of the columns is a custom type, how
> do
> > > you
> > > > > serialize the arguments to the prepared statement? Do you accept
> > > anything
> > > > > and let C* complain, or do you make a best effort to shoehorn the
> > > object
> > > > > the user passed into something that looks like the custom type?
> > > > >
> > > >
> > > > Just to be clear, by "custom type", you still mean a user-defined
> type,
> > > > correct?
> > > >
> > > > At least in the python driver, it's treated the same as any other
> > > > (parametrized) type.  For each Cassandra type (UTF8Type, Int32Type,
> > etc),
> > > > the driver will accept values of one or more types.  If any of the
> > > subtypes
> > > > don't match this, the driver will raise an exception.
> > > >
> > > > If you're actually talking about custom types and not user-defined
> > types,
> > > > I'll explain what the python driver does.  If the typestring (e.g.
> > > > org.apache.cassandra.db.marshal.MyType) isn't recognized, the driver
> > will
> > > > expect a binary string that it can pass directly to Cassandra for
> > values
> > > of
> > > > that type.  If the user wants to add driver-level support for it (to
> > > enable
> > > > converting a python object to a binary string and vice-versa), they
> can
> > > > subclass cassandra.cqltypes.CassandraType and define a serialize()
> and
> > > > deserialize() method.  The only condition is that the python
> classname
> > > must
> > > > match the typestring from cassandra, so for
> > > > org.apache.cassandra.db.marshal.MyType, the user will create a
> > > > MyType(CassandraType) class.
> > > >
> > > > --
> > > > Tyler Hobbs
> > > > DataStax <http://datastax.com/>
> > > >
> > >
> >
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message