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pypm install collective.atcassandrastorage

How to install collective.atcassandrastorage

  1. Download and install ActivePython
  2. Open Command Prompt
  3. Type pypm install collective.atcassandrastorage
 Python 2.7Python 3.2Python 3.3
Windows (32-bit)
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Windows (64-bit)
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Mac OS X (10.5+)
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Linux (32-bit)
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Linux (64-bit)
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Lastest release
version 0.2 on Jan 5th, 2011


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 plone.app.registry
  • per-field configurable keyspace and column family for fields
  • The UID of the instance object is used as a key in the specified

System Message: WARNING/2 (<string>, line 30)

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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:

System Message: WARNING/2 (<string>, line 41)

Literal block expected; none found.

from collective.atcassandrastorage.storage import CassandraFieldStorage

MySchema = atapi.Schema( ... StringField("afield", 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 plone.app.registry. Visit the registry in Plone's control panel and configure the values, they should be pretty much obvious.


plone.app.registry for configuration

pycassa python Cassandra glue library


0.2 (2010-05-31)
  • Added tests.

System Message: WARNING/2 (<string>, line 91)

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  • Introduce IInstanceKey interface to allow to overwrite instance key

System Message: WARNING/2 (<string>, line 94)

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calculation. [seletz]

0.1 (2010-05-29)
  • Initial release

System Message: WARNING/2 (<string>, line 101)

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Last updated Jan 5th, 2011

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