Question

我已经设置了Titan + Cassandra + Elasticsearch + Rexster服务器。一切安装正确，我能够在Gremlin控制台中玩“神的图”。我用titan.sh脚本开始了所有操作。

titan/bin/titan.sh status输出：

Titan + Rexster (com.tinkerpop.rexster.Application) is running with pid 4443
Cassandra (org.apache.cassandra.service.CassandraDaemon) is running with pid 3909
Elasticsearch (org.elasticsearch.bootstrap.Elasticsearch) is running with pid 4280

如果我转到http://localhost:8182/doghouse，我可以看到一个名为“图表”的空图表。

现在我尝试使用灯泡包（http://bulbflow.com/）从Python（3.4）连接到Rexster。我正在尝试的代码非常简单：

from bulbs.rexster import Graph, Config
kg = Graph(Config('http://localhost:8182/graphs/graph'))

我得到以下异常：

Traceback (most recent call last):
  File "/home/iulian/PycharmProjects/pygm/py/gm/graph/__main__.py", line 194, in <module>
    main(sys.argv)
  File "/home/iulian/PycharmProjects/pygm/py/gm/graph/__main__.py", line 160, in main
    kg = Graph(Config('http://localhost:8182/graphs/graph'))
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rexster/graph.py", line 56, in __init__
    super(Graph, self).__init__(config)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/base/graph.py", line 58, in __init__
    self.vertices = self.build_proxy(Vertex)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/base/graph.py", line 124, in build_proxy
    return self.factory.build_element_proxy(element_class, index_class)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/factory.py", line 19, in build_element_proxy
    primary_index = self.get_index(element_class,index_class,index_name)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/factory.py", line 27, in get_index
    index = index_proxy.get_or_create(index_name)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rexster/index.py", line 80, in get_or_create
    resp = self.client.get_or_create_vertex_index(index_name, index_params)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rexster/client.py", line 668, in get_or_create_vertex_index
    resp = self.gremlin(script, params)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rexster/client.py", line 356, in gremlin
    return self.request.post(gremlin_path, params)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rest.py", line 131, in post
    return self.request(POST, path, params)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rest.py", line 186, in request
    return self.response_class(http_resp, self.config)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rexster/client.py", line 198, in __init__
    self.handle_response(response)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rexster/client.py", line 222, in handle_response
    response_handler(http_resp)
  File "/home/iulian/py3venv/lib/python3.4/site-packages/bulbs/rest.py", line 50, in server_error
    raise SystemError(http_resp)
SystemError: ({'status': '500', 'server': 'grizzly/2.2.16', 'transfer-encoding': 'chunked', 'connection': 'close', 'access-control-allow-origin': '*', 'content-type': 'application/json', 'date': 'Sun, 12 Apr 2015 16:38:03 GMT'}, b'{"success":false,"api":{"description":"evaluate an ad-hoc Gremlin script for a graph.","parameters":{"rexster.showTypes":"displays the properties of the elements with their native data type (default is false)","load":"a list of \'stored procedures\' to execute prior to the \'script\' (if \'script\' is not specified then the last script in this argument will return the values","returnTotal":"when set to true, the full result set will be iterated and the results returned (default is false)","language":"the gremlin language flavor to use (default is groovy)","params":"a map of parameters to bind to the script engine","script":"the Gremlin script to be evaluated","rexster.returnKeys":"an array of element property keys to return (default is to return all element properties)","rexster.offset.start":"start index for a paged set of data to be returned","rexster.offset.end":"end index for a paged set of data to be returned"}},"message":"","error":"javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: groovy.lang.MissingMethodException.idx() is applicable for argument types: () values: []\\nPossible solutions: is(java.lang.Object), find(), any(), find(groovy.lang.Closure), any(groovy.lang.Closure), with(groovy.lang.Closure)"}')

我应该添加名为“graph”的图形是我在Rexster中找到的默认图形，并且我没有添加。

所以，我有一些问题：

你如何用灯泡连接到Rexster（我当然做错了什么）？
如何创建新图表？

Answer 1

1）尝试使用bulbs.titan.Graph而不是bulbs.rexster.Graph - titan和rexster相似，但灯泡是特殊的套管泰坦行为。

2）在XML配置文件中配置Titan图。寻找

<graphs>
    <graph>

    </graph>
</graphs>

在rexster-cassandra.xml或rexster-cassandra-es.xml或您正在使用的配置文件中进行配置。

使用灯泡连接到Rexster时出现SystemError

1 个答案: