def alter_keyspace(self, keyspace, replication_factor=None,
replication_strategy=None,
strategy_options=None):
"""
Alters an existing keyspace.
.. warning:: Don't use this unless you know what you are doing.
Parameters are the same as for :meth:`create_keyspace()`.
"""
old_ksdef = self._conn.describe_keyspace(keyspace)
ksdef = KsDef(name=old_ksdef.name,
strategy_class=old_ksdef.strategy_class,
strategy_options=old_ksdef.strategy_options,
replication_factor=old_ksdef.replication_factor,
cf_defs=[])
if replication_strategy is not None:
if replication_strategy.find('.') == -1:
ksdef.strategy_class = 'org.apache.cassandra.locator.%s' % replication_strategy
else:
ksdef.strategy_class = replication_strategy
if strategy_options is not None:
ksdef.strategy_options = strategy_options
if replication_factor is not None:
ksdef.replication_factor = replication_factor
if self._conn.version == CASSANDRA_08:
ksdef = ksdef.to08()
else:
ksdef = ksdef.to07()
self._system_update_keyspace(ksdef)
def alter_keyspace(self, keyspace, replication_factor=None,
replication_strategy=None,
strategy_options=None):
"""
Alters an existing keyspace.
.. warning:: Don't use this unless you know what you are doing.
Parameters are the same as for :meth:`create_keyspace()`.
"""
old_ksdef = self._conn.describe_keyspace(keyspace)
ksdef = KsDef(name=old_ksdef.name,
strategy_class=old_ksdef.strategy_class,
strategy_options=old_ksdef.strategy_options,
replication_factor=old_ksdef.replication_factor,
cf_defs=[])
if replication_strategy is not None:
if replication_strategy.find('.') == -1:
ksdef.strategy_class = 'org.apache.cassandra.locator.%s' % replication_strategy
else:
ksdef.strategy_class = replication_strategy
if strategy_options is not None:
ksdef.strategy_options = strategy_options
if replication_factor is not None:
ksdef.replication_factor = replication_factor
if self._conn.version == CASSANDRA_08:
ksdef = ksdef.to08()
else:
ksdef = ksdef.to07()
self._system_update_keyspace(ksdef)
def create_keyspace(self,
name,
replication_factor=None,
replication_strategy=SIMPLE_STRATEGY,
strategy_options=None):
"""
Creates a new keyspace. Column families may be added to this keyspace
after it is created using :meth:`create_column_family()`.
`replication_factor` determines how many nodes hold a copy of a given
row. Note that for Cassandra 0.8, `replication_factor` should be an entry
in the strategy_options :class:`dict`. For example:
.. code-block:: python
>>> sys.create_keyspace('KS', None, SIMPLE_STRATEGY, {'replication_factor': '1'})
However, pycassa will copy the value from `replication_factor` or `strategy_options`
to the other as needed, depending on the version of Cassandra.
`replication_strategy` determines how replicas are chosen for this keyspace.
The strategies that Cassandra provides by default
are available as :const:`SIMPLE_STRATEGY`, :const:`NETWORK_TOPOLOGY_STRATEGY`,
and :const:`OLD_NETWORK_TOPOLOGY_STRATEGY`. `NETWORK_TOPOLOGY_STRATEGY` requires
`strategy_options` to be present.
`strategy_options` is an optional dictionary of strategy options. By default, these
are only used by NetworkTopologyStrategy; in this case, the dictionary should
look like: ``{'Datacenter1': '2', 'Datacenter2': '1'}``. This maps each
datacenter (as defined in a Cassandra property file) to a replica count.
Example Usage:
.. code-block:: python
>>> from pycassa.system_manager import *
>>> sys = SystemManager('192.168.10.2:9160')
>>> # Create a SimpleStrategy keyspace
>>> sys.create_keyspace('SimpleKS', 1)
>>> # Create a NetworkTopologyStrategy keyspace
>>> sys.create_keyspace('NTS_KS', 3, NETWORK_TOPOLOGY_STRATEGY, {'DC1': '2', 'DC2': '1'})
>>> sys.close()
"""
if replication_strategy.find('.') == -1:
strategy_class = 'org.apache.cassandra.locator.%s' % replication_strategy
else:
strategy_class = replication_strategy
ksdef = KsDef(name, strategy_class, strategy_options,
replication_factor, [])
if self._conn.version == CASSANDRA_08:
ksdef = ksdef.to08()
else:
ksdef = ksdef.to07()
self._system_add_keyspace(ksdef)
def create_keyspace(self, name, replication_factor=None,
replication_strategy=SIMPLE_STRATEGY,
strategy_options=None):
"""
Creates a new keyspace. Column families may be added to this keyspace
after it is created using :meth:`create_column_family()`.
`replication_factor` determines how many nodes hold a copy of a given
row. Note that for Cassandra 0.8, `replication_factor` should be an entry
in the strategy_options :class:`dict`. For example:
.. code-block:: python
>>> sys.create_keyspace('KS', None, SIMPLE_STRATEGY, {'replication_factor': '1'})
However, pycassa will copy the value from `replication_factor` or `strategy_options`
to the other as needed, depending on the version of Cassandra.
`replication_strategy` determines how replicas are chosen for this keyspace.
The strategies that Cassandra provides by default
are available as :const:`SIMPLE_STRATEGY`, :const:`NETWORK_TOPOLOGY_STRATEGY`,
and :const:`OLD_NETWORK_TOPOLOGY_STRATEGY`. `NETWORK_TOPOLOGY_STRATEGY` requires
`strategy_options` to be present.
`strategy_options` is an optional dictionary of strategy options. By default, these
are only used by NetworkTopologyStrategy; in this case, the dictionary should
look like: ``{'Datacenter1': '2', 'Datacenter2': '1'}``. This maps each
datacenter (as defined in a Cassandra property file) to a replica count.
Example Usage:
.. code-block:: python
>>> from pycassa.system_manager import *
>>> sys = SystemManager('192.168.10.2:9160')
>>> # Create a SimpleStrategy keyspace
>>> sys.create_keyspace('SimpleKS', 1)
>>> # Create a NetworkTopologyStrategy keyspace
>>> sys.create_keyspace('NTS_KS', 3, NETWORK_TOPOLOGY_STRATEGY, {'DC1': '2', 'DC2': '1'})
>>> sys.close()
"""
if replication_strategy.find('.') == -1:
strategy_class = 'org.apache.cassandra.locator.%s' % replication_strategy
else:
strategy_class = replication_strategy
ksdef = KsDef(name, strategy_class, strategy_options, replication_factor, [])
if self._conn.version == CASSANDRA_08:
ksdef = ksdef.to08()
else:
ksdef = ksdef.to07()
self._system_add_keyspace(ksdef)