unable to connect to Astra using python driver, Java works fine
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Li Lin
Jun 13, 2020, 4:21:13 AM6/13/20
to DataStax Python Driver for Apache Cassandra User Mailing List
I got some error when trying to connect to Astra using python driver, at the same time my Java code can connect without issue, could anyone help to point me to the right connection?
I'm using Ubuntu 20.04, and its default python 3.8
cassandra-driver==3.23.0 # via -r requirements.in
click==7.1.2 # via geomet
geomet==0.1.2 # via cassandra-driver
lz4==3.1.0 # via -r requirements.in
mimesis==4.0.0 # via -r requirements.in
six==1.15.0 # via cassandra-driver, geomet
# code
cluster = Cluster(
cloud={'secure_connect_bundle': 'astra.zip'}, # this file works with java code
auth_provider=PlainTextAuthProvider('user', 'pass')) # same username and password work in java code
return cluster.connect('vino9') # this keyspace does exist. not using this parameter resulting in same error
# error message
Traceback (most recent call last):
File "/usr/lib/python3.8/urllib/request.py", line 1326, in do_open
h.request(req.get_method(), req.selector, req.data, headers,
File "/usr/lib/python3.8/http/client.py", line 1240, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/lib/python3.8/http/client.py", line 1286, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/lib/python3.8/http/client.py", line 1235, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/lib/python3.8/http/client.py", line 1006, in _send_output
self.send(msg)
File "/usr/lib/python3.8/http/client.py", line 946, in send
self.connect()
File "/usr/lib/python3.8/http/client.py", line 1409, in connect
self.sock = self._context.wrap_socket(self.sock,
File "/usr/lib/python3.8/ssl.py", line 500, in wrap_socket
return self.sslsocket_class._create(
File "/usr/lib/python3.8/ssl.py", line 1040, in _create
self.do_handshake()
File "/usr/lib/python3.8/ssl.py", line 1309, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL] internal error (_ssl.c:1108)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/lee/Projects/git/bank-demo/testdata/venv/lib/python3.8/site-packages/cassandra/datastax/cloud/__init__.py", line 137, in read_metadata_info
response = urlopen(url, context=config.ssl_context, timeout=timeout)
File "/usr/lib/python3.8/urllib/request.py", line 222, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python3.8/urllib/request.py", line 525, in open
response = self._open(req, data)
File "/usr/lib/python3.8/urllib/request.py", line 542, in _open
result = self._call_chain(self.handle_open, protocol, protocol +
File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
result = func(*args)
File "/usr/lib/python3.8/urllib/request.py", line 1369, in https_open
return self.do_open(http.client.HTTPSConnection, req,
File "/usr/lib/python3.8/urllib/request.py", line 1329, in do_open
raise URLError(err)
urllib.error.URLError: <urlopen error [SSL] internal error (_ssl.c:1108)>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "gen_accounts.py", line 104, in <module>
sess = create_session('astra')
File "gen_accounts.py", line 79, in create_session
cluster = Cluster(
File "cassandra/cluster.py", line 1122, in cassandra.cluster.Cluster.__init__
File "/home/lee/Projects/git/bank-demo/testdata/venv/lib/python3.8/site-packages/cassandra/datastax/cloud/__init__.py", line 92, in get_cloud_config
config = read_metadata_info(config, cloud_config)
File "/home/lee/Projects/git/bank-demo/testdata/venv/lib/python3.8/site-packages/cassandra/datastax/cloud/__init__.py", line 140, in read_metadata_info
raise DriverException("Unable to connect to the metadata service at %s. "
cassandra.DriverException: Unable to connect to the metadata service at https://f99fef32-c430-4ee2-9f46-7fca05d39513-us-east1.db.astra.datastax.com:30118/metadata. Check the cluster status in the cloud console.
Li Lin
Jun 13, 2020, 4:48:32 AM6/13/20
to DataStax Python Driver for Apache Cassandra User Mailing List
I tried the same code on a Mac, with python 3.7, worked fine....hm...
Alan Boudreault
Jun 13, 2020, 7:14:56 AM6/13/20
to DataStax Python Driver for Apache Cassandra User Mailing List
Hi Li Lin,
This is a known issue. It will be fixed in the next 3.24 release, planned for wednesday.
Alan
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