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A AT field storage which stores values to a cassandra database

Project description

Author: Stefan Eletzhofer
Date: 2010-05-28


An Archetype field storage which uses a cassandra backing store.


For a customer project I’m doing right now I’m using cassandra as a storage backend for Plone FormGen data. Now the need did arise to also have specific fields of AT content types to be stored in cassandra as well.

Design decisions

  • configuration of the cassandra clients done by using
  • per-field configurable keyspace and column family for fields
  • The UID of the instance object is used as a key in the specified column family (remember that an insert in cassandra is essentially an update)
  • using pycassa as glue library


Import the storage and attach it to a field in your AT Schema:

from import CassandraFieldStorage

MySchema = atapi.Schema(
              storage=CassandraFieldStorage("AKeyspace", "AColumnFamily"),

This will store and fetch data for afield from a cassandra database using the keyspace AKeyspace and the column family AColumnFamily.


Configuration is done using Visit the registry in Plone’s control panel and configure the values, they should be pretty much obvious.

for configuration
python Cassandra glue library


0.2 (2010-05-31)

  • Added tests. [seletz]
  • Introduce IInstanceKey interface to allow to overwrite instance key calculation. [seletz]

0.1 (2010-05-29)

  • Initial release [seletz]

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