I am using the Gremlin-Python Client to query Gremlin Server with a janusgraph backend.
Running the following query:
graph = Graph()
g = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g'))
sg = g.E().subgraph('a').cap('a').next()
The query returns a subgraph containing a list of edges and vertices.
I have the following serializers configured on the server
serializers:
- { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0, config: { serializeResultToString: true }}
- { className: org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0, config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
Does anyone know how to configure gremlin-server and a sample code to return a fully populated subgraph?
Updated test case based on Stephen's feedback
# DB: Janusgraph with Opensource Cassandra storage backend
# Data: v[41427160]--reports_to-->v[36712472]--reports_to-->v[147841048]
# Objective: get subgraph detached to python client with all properties of the vertex and edges
(py365)$ pip list | grep gremlinpython
gremlinpython 3.3.4
(py365)$ python
Python 3.6.5 (default, Apr 25 2018, 14:26:36)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from gremlin_python.driver import client
>>> from gremlin_python.driver.serializer import GraphSONSerializersV3d0
>>> session = client.Client('ws://localhost:8182/gremlin', 'g', message_serializer=GraphSONSerializersV3d0())
>>> query_parameters = {"vids": [41427160, 36712472]}
>>> query = "g.V(vids).outE('reports_to').subgraph('1').otherV().cap('1').next()"
>>> results = session.submit(query, query_parameters)
>>> for r in results:
... r_vertices = r[0]['@value'].get('vertices')
... r_edges = r[0]['@value'].get('edges')
... print(r)
... print(r_vertices)
... print(r_edges)
...
[{'@type': 'tinker:graph', '@value': {'vertices': [v[41427160], v[147841048], v[36712472]], 'edges': [e[{'@type': 'janusgraph:RelationIdentifier', '@value': {'relationId': '21y8ez-onxeg-f11-luviw'}}][41427160-reports_to->36712472], e[{'@type': 'janusgraph:RelationIdentifier', '@value': {'relationId': '225dz7-luviw-f11-2g0qvs'}}][36712472-reports_to->147841048]]}}]
[v[41427160], v[147841048], v[36712472]]
[e[{'@type': 'janusgraph:RelationIdentifier', '@value': {'relationId': '21y8ez-onxeg-f11-luviw'}}][41427160-reports_to->36712472], e[{'@type': 'janusgraph:RelationIdentifier', '@value': {'relationId': '225dz7-luviw-f11-2g0qvs'}}][36712472-reports_to->147841048]]
>>>
Is it true that gremlinpython is lightweight that, even when using script based approach, only necessary elements(id and label) are detached as "reference elements" part of the graphson?
