some docs improvement for 3.7.0

cassandra/policies.py

@@ -939,6 +939,9 @@ class NoSpeculativeExecutionPolicy(SpeculativeExecutionPolicy):
 
 
 class ConstantSpeculativeExecutionPolicy(SpeculativeExecutionPolicy):
+    """
+    A speculative execution policy that sends a new query every X seconds (**delay**) for a maximum of Y attempts (**max_attempts**).
+    """
 
     def __init__(self, delay, max_attempts):
         self.delay = delay

docs/api/cassandra/policies.rst

@@ -68,3 +68,12 @@ Retrying Failed Operations
 
 .. autoclass:: DowngradingConsistencyRetryPolicy
    :members:
+
+Retrying Idempotent Operations
+------------------------------
+
+.. autoclass:: SpeculativeExecutionPolicy
+   :members:
+
+.. autoclass:: ConstantSpeculativeExecutionPolicy
+   :members:

docs/query_paging.rst

@@ -3,7 +3,7 @@
 Paging Large Queries
 ====================
 Cassandra 2.0+ offers support for automatic query paging.  Starting with
-version 2.0 of the driver, if :attr:`~.Cluster.protocol_version` is greater than 
+version 2.0 of the driver, if :attr:`~.Cluster.protocol_version` is greater than
 :const:`2` (it is by default), queries returning large result sets will be
 automatically paged.
 
@@ -74,3 +74,22 @@ pages.  For example::
     handler.finished_event.wait()
     if handler.error:
         raise handler.error
+
+Resume Paged Results
+--------------------
+
+You can resume the pagination when executing a new query by using the :attr:`.ResultSet.paging_state`. This can be useful if you want to provide some stateless pagination capabilities to your application (ie. via http). For example::
+
+    from cassandra.query import SimpleStatement
+    query = "SELECT * FROM users"
+    statement = SimpleStatement(query, fetch_size=10)
+    results = session.execute(statement)
+
+    # save the paging_state somewhere and return current results
+    session['paging_stage'] = results.paging_state
+
+
+    # resume the pagination sometime later...
+    statement = SimpleStatement(query, fetch_size=10)
+    ps = session['paging_state']
+    results = session.execute(statement, paging_state=ps)