python - 'Murmur3Partitioner' 的 C 扩展未编译

Question

我正在研究这个python-cassandra tutorial 。

当我运行此命令时

cluster = Cluster(
  contact_points=['127.0.0.1'],
  load_balancing_policy= 
     TokenAwarePolicy(DCAwareRoundRobinPolicy(local_dc='datacenter1')),
  default_retry_policy = RetryPolicy()
 )
session = cluster.connect('demo')

我收到以下错误:

>>> session = cluster.connect('mykeyspace')
    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/local/lib/python2.7/dist-packages/cassandra/cluster.py", 
          line 700, in connect
    self.load_balancing_policy.check_supported()
    File "/usr/local/lib/python2.7/dist-packages/cassandra/policies.py", 
          line 345, in check_supported
          (self.__class__.__name__, self._cluster_metadata.partitioner))
    Exception: TokenAwarePolicy cannot be used with the cluster partitioner
    (org.apache.cassandra.dht.Murmur3Partitioner) because the relevant C extension 
    for this driver was not compiled. See the installation instructions for details 
    on building and installing the C extensions.

但是，当我运行以下命令(应该按照文档中所述重建 C 扩展)时，我得到了一切正确的确认。

user1@mybox-VirtualBox:~$ sudo apt-get install gcc python-dev
[sudo] password for user1: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gcc is already the newest version.
python-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 254 not upgraded.

我错过了什么吗？

Answer 1

安装 gcc 和 python-dev 后，您需要返回并重新安装 Cassandra Python 驱动程序。假设您还安装了编译 libev 的支持，整个序列如下所示:

$ sudo apt-get install gcc python-dev
$ sudo apt-get install libev4 libev-dev
$ sudo pip uninstall cassandra-driver
$ sudo pip install cassandra-driver

在第二次安装时，C 扩展应该可以正确编译。