无法将 python 与 Titan db 连接

Question

按照步骤配置titan srever

bin/titan.sh

Forking Cassandra...
Running `nodetool statusthrift`... OK (returned exit status 0 and printed string "running").
Forking Elasticsearch...
Connecting to Elasticsearch (127.0.0.1:9300)... OK (connected to 127.0.0.1:9300).
Forking Gremlin-Server...
Connecting to Gremlin-Server (127.0.0.1:8182)... OK (connected to 127.0.0.1:8182).
Run gremlin.sh to connect.

服务器完美启动，但是当我使用 python 连接然后运行脚本时，出现了我在下面提到的错误

Traceback (most recent call last):
  File "/home/admin-12/Documents/bitbucket/ecodrone/ecodrone/GremlinConnector.py", line 28, in <module>
    data = (execute_query("""g.V()"""))
  File "/home/admin-12/Documents/bitbucket/ecodrone/ecodrone/GremlinConnector.py", line 22, in execute_query
    results = future_results.result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 432, in result
    return self.__get_result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/home/admin-12/.local/lib/python3.6/site-packages/gremlin_python/driver/resultset.py", line 81, in cb
    f.result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 425, in result
    return self.__get_result()
  File "/usr/lib/python3.6/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/admin-12/.local/lib/python3.6/site-packages/gremlin_python/driver/connection.py", line 77, in _receive
    self._protocol.data_received(data, self._results)
  File "/home/admin-12/.local/lib/python3.6/site-packages/gremlin_python/driver/protocol.py", line 71, in data_received
    result_set = results_dict[request_id]
KeyError: None

我正在使用的版本控制
泰坦 - 1.0.0
gremlin-python - 3.3.2
apache-tinkerpop-gremlin-server-3.3.1

Answer 1

Titan 支持一些非常旧的 TinkerPop 版本，如果您尝试使用 gremlin-python 3.3.2，我相信您会发现其中的一些不兼容性。由于 Titan 不再受支持，我建议您升级到 JanusGraph，这是一个更新和维护的 Titan 版本。