77 lines
2.7 KiB
ReStructuredText
77 lines
2.7 KiB
ReStructuredText
Upgrading
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=========
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Upgrading to 2.0 from 1.x
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-------------------------
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Version 2.0 of the DataStax python driver for Apache Cassandra
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includes some notable improvements over version 1.x. This version
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of the driver supports Cassandra 1.2, 2.0, and 2.1. However, not
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all features may be used with Cassandra 1.2, and some new features
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in 2.1 are not yet supported.
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Using the v2 Native Protocol
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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By default, the driver will attempt to use version 2 of Cassandra's
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native protocol. When working with Cassandra 1.2, you will need to
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explicitly set the :attr:`~.Cluster.protocol_version` to 1:
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.. code-block:: python
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from cassandra.cluster import Cluster
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cluster = Cluster(protocol_version=1)
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Automatic Query Paging
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^^^^^^^^^^^^^^^^^^^^^^
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Version 2 of the native protocol adds support for automatic query
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paging, which can make dealing with large result sets much simpler.
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See :ref:`query-paging` for full details.
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Protocol-Level Batch Statements
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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With version 1 of the native protocol, batching of statements required
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using a `BATCH cql query <http://cassandra.apache.org/doc/cql3/CQL.html#batchStmt>`_.
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With version 2 of the native protocol, you can now batch statements at
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the protocol level. This allows you to use many different prepared
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statements within a single batch.
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See :class:`~.query.BatchStatement` for details and usage examples.
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SASL-based Authentication
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^^^^^^^^^^^^^^^^^^^^^^^^^
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Also new in version 2 of the native protocol is SASL-based authentication.
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See the section on :ref:`security` for details and examples.
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Lightweight Transactions
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^^^^^^^^^^^^^^^^^^^^^^^^
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`Lightweight transactions <http://www.datastax.com/dev/blog/lightweight-transactions-in-cassandra-2-0>`_ are another new feature. To use lightweight transactions, add ``IF`` clauses
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to your CQL queries and set the :attr:`~.Statement.serial_consistency_level`
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on your statements.
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Deprecations
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^^^^^^^^^^^^
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The following functions have moved from ``cassandra.decoder`` to ``cassandra.query``.
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The original functions have been left in place with a :exc:`DeprecationWarning` for
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now:
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* :attr:`cassandra.decoder.tuple_factory` has moved to
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:attr:`cassandra.query.tuple_factory`
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* :attr:`cassandra.decoder.named_tuple_factory` has moved to
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:attr:`cassandra.query.named_tuple_factory
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* :attr:`cassandra.decoder.dict_factory` has moved to
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:attr:`cassandra.query.dict_factory`
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* :attr:`cassandra.decoder.ordered_dict_factory` has moved to
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:attr:`cassandra.query.ordered_dict_factory`
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Dependency Changes
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^^^^^^^^^^^^^^^^^^
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The following dependencies have officially been made optional:
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* ``scales``
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* ``blist``
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And one new dependency has been added (to enable Python 3 support):
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* ``six``
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