Create Upgrading section of docs

docs/index.rst

@@ -7,6 +7,7 @@ Python Cassandra Driver
    api/index
    installation
    getting_started
+   upgrading
    performance
    query_paging
    security

docs/query_paging.rst

@@ -1,3 +1,5 @@
+.. _query-paging:
+
 Paging Large Queries
 ====================
 Cassandra 2.0+ offers support for automatic query paging.  Starting with

docs/security.rst

@@ -1,3 +1,5 @@
+.. _security:
+
 Security
 ========
 The two main security components you will use with the

docs/upgrading.rst

@@ -0,0 +1,76 @@
+Upgrading
+=========
+
+Upgrading to 2.0 from 1.x
+-------------------------
+Version 2.0 of the DataStax python driver for Apache Cassandra
+includes some notable improvements over version 1.x.  This version
+of the driver supports Cassandra 1.2, 2.0, and 2.1.  However, not
+all features may be used with Cassandra 1.2, and some new features
+in 2.1 are not yet supported.
+
+Using the v2 Native Protocol
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+By default, the driver will attempt to use version 2 of Cassandra's
+native protocol.  When working with Cassandra 1.2, you will need to
+explicitly set the :attr:`~.Cluster.protocol_version` to 1:
+
+.. code-block:: python
+
+    from cassandra.cluster import Cluster
+
+    cluster = Cluster(protocol_version=1)
+
+Automatic Query Paging
+^^^^^^^^^^^^^^^^^^^^^^
+Version 2 of the native protocol adds support for automatic query
+paging, which can make dealing with large result sets much simpler.
+
+See :ref:`query-paging` for full details.
+
+Protocol-Level Batch Statements
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+With version 1 of the native protocol, batching of statements required
+using a `BATCH cql query <http://cassandra.apache.org/doc/cql3/CQL.html#batchStmt>`_.
+With version 2 of the native protocol, you can now batch statements at
+the protocol level. This allows you to use many different prepared
+statements within a single batch.
+
+See :class:`~.query.BatchStatement` for details and usage examples.
+
+SASL-based Authentication
+^^^^^^^^^^^^^^^^^^^^^^^^^
+Also new in version 2 of the native protocol is SASL-based authentication.
+See the section on :ref:`security` for details and examples.
+
+Lightweight Transactions
+^^^^^^^^^^^^^^^^^^^^^^^^
+`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
+to your CQL queries and set the :attr:`~.Statement.serial_consistency_level`
+on your statements.
+
+Deprecations
+^^^^^^^^^^^^
+The following functions have moved from ``cassandra.decoder`` to ``cassandra.query``.
+The original functions have been left in place with a :exc:`DeprecationWarning` for
+now:
+
+* :attr:`cassandra.decoder.tuple_factory` has moved to
+  :attr:`cassandra.query.tuple_factory`
+* :attr:`cassandra.decoder.named_tuple_factory` has moved to
+  :attr:`cassandra.query.named_tuple_factory
+* :attr:`cassandra.decoder.dict_factory` has moved to
+  :attr:`cassandra.query.dict_factory`
+* :attr:`cassandra.decoder.ordered_dict_factory` has moved to
+  :attr:`cassandra.query.ordered_dict_factory`
+
+Dependency Changes
+^^^^^^^^^^^^^^^^^^
+The following dependencies have officially been made optional:
+
+* ``scales``
+* ``blist``
+
+And one new dependency has been added (to enable Python 3 support):
+
+* ``six``