问题
I am trying to connect to cassandra, which is running on local desktop, via cassandra-driver for python using this simple code.
from cassandra.cluster import Cluster
cluster = Cluster()
session = cluster.connect()
and getting this error: NoHostAvailable: ('Unable to connect to any servers', {'127.0.0.1': InvalidRequest(u'code=2200 [Invalid query] message="unconfigured table schema_keyspaces"',)})
From the logs of cassandra, I see how it does establish connection, but it gets this errors:
DEBUG 05:51:00 Responding: ERROR INVALID: unconfigured table schema_columnfamilies, v=4
DEBUG 05:51:00 Responding: ERROR INVALID: unconfigured table schema_usertypes, v=4
DEBUG 05:51:00 Responding: ERROR INVALID: unconfigured table schema_columns, v=4
DEBUG 05:51:00 Responding: ERROR INVALID: unconfigured table schema_functions, v=4
DEBUG 05:51:00 Responding: ERROR INVALID: unconfigured table schema_aggregates, v=4
DEBUG 05:51:00 Responding: ERROR INVALID: unconfigured table schema_triggers, v=4
Any help to solve this problem with unconfigured tables will be appreciated.
回答1:
Are you possibly using the driver to connect to Cassandra 3.0.0-alpha1? If so, you'd need to be running the driver installed from this commit:
https://github.com/datastax/python-driver/tree/1a480f196ade42798596f5257d2cbeffcadf154f
Alternatively:
- If you're just experimenting, the released drivers as of today work with all Cassandra versions 1.2 - 2.2.0
DataStax is readying a 3.0.0a1 version of the driver for use with Cassandra 3.0.0-alpha1, which will be available in pypi soon.install the 3.0.0 alpha version of the driver as follows:
pip install --pre cassandra-driver
pip install --pre --upgrade cassandra-driver
回答2:
This thread came up when I had the same error message and searched for info, but the answers given didn't help me. I found the issue eventually. I'm running Cassandra 3.6, and the cassandra-driver currently available is version 3.4.1.
However, for some reason I had version 2.2.0 of cassandra-driver installed. I understand the table schema_keyspaces has been renamed/moved in later versions, so that explains why the old driver didn't get the results it expected and bailed out.
来源：https://stackoverflow.com/questions/31824537/error-unable-to-connect-to-cassandra-server-unconfigured-table