Titan 图数据库中的 Cassandra 键空间

Question

我使用 Cassandra 作为后端，并使用以下属性在 gremlin 中创建了一个密钥空间

conf=new BaseConfiguration();
conf.setProperty('storage.backend','cassandra');
conf.setProperty('storage.hostname','127.0.0.1');
conf.setProperty('storage.keyspace','MyTitanKeySpace');
g=TitanFactory.open(conf);  //opening graph with configuration

Now I'm adding vertices namely subbu and sures and one relation between them

gremlin> Subbu=g.addVertex(null);// adding vertex name Subbu
==>v[4]
gremlin> Sures=g.addVertex(null);
==>v[8]
gremlin> Subbu.setProperty("name","subbu"); //assigning name Subbu to the vertex
==>null
gremlin> Sures.setProperty("name","sures");
==>null
gremlin> edge=g.addEdge(null,Subbu,Sures,'friends');//creating edge

==>e[x-8-2F0LaTPQAS][4-friends->8]

gremlin>g.commit();//save graph
gremlin>g.V
v[4]
v[8]

Now I'm creating one more graph with same key space name

f==TitanFactory.open(conf);

现在我正在添加顶点，即 Muthu 和 Saran 以及它们之间的一种关系

gremlin> Muthu=f.addVertex(null); // adding vertex name Subbu
==>v[12]
gremlin> Saran=f.addVertex(null);
==>v[16]
gremlin> Muthu.setProperty("name","Muthu");//setting name to the vertex
==>null
gremlin> Saran.setProperty("name","Saran");
==>null
gremlin> edge=g.addEdge(null,Muthu,Saran,'friends');//creating edge

==>e[x-12-2F0LaTPQAS][12-friends->16]

gremlin>f.commit();//save graph
gremlin>f.V //displaying all vertices in graph f
v[4]
v[8]
v[12]
v[16]
It is showing all vertices in the key space but i want only particular graph vertices how it is possible why it is showing all vertices ?

有人可以回复我吗？

Answer 1

也许你对TitanFactory.open 的所作所为感到困惑。你写：

Now I'm creating one more graph with same key space name

f==TitanFactory.open(conf);

您不是在使用该代码“再创建一个图形”，而是在与该方法的第一次调用相同的键空间中连接到相同的 Cassandra 实例。这是同一张图，所以当您查看所有带有g.V 的顶点时，您会看到在第一个连接中添加的顶点和在第二个连接中添加的顶点。

如果您尝试共享单个 Cassandra 实例，则需要在调用 TitanFactory.open(conf) 之前将 conf 中的键空间设置更改为不同的键空间，在这种情况下，图表应该是分开的。

Answer 2

I did like this it is working fine
gremlin> g = TitanFactory.open(conf)
    gremlin> pg = new PartitionGraph(g, '_partition', 'a')
    ==>partitiongraph[titangraph[inmemory:null]]
    gremlin> Subbu = pg.addVertex(null)
    ==>v[4]
    gremlin> Sures = pg.addVertex(null)
    ==>v[8]
etc...