JanusGraph•2y ago

Multiple Graphs with Embedded JanusGraph

Hello!! I am using embedded Janusgraph (embedded JanusGraph as a library inside my Java Application). I am trying to figure out if I can write two different named graphs to the same database. I am trying to use https://docs.janusgraph.org/operations/configured-graph-factory/ to create multiple graphs. I set the name of the graph in graph.graphname in my JanusGraph configuration. But I get the following error while opening the graph

Gremlin Server must be configured to use the JanusGraphManager.

Gremlin Server must be configured to use the JanusGraphManager.

But I don't use the gremlin server and I am using embedded janusgraph. Can I create multiple dynamic graphs in the same storage ?

5 Replies

deepak8347OP•2y ago

A yaml representation of my janusgraph config is

  janusGraphConfig:
    storage:
      backend: "com.company.department.diskstorage.cassandra.CompanyCassandraStoreManager"
      batch-loading: true
    query:
      batch: true
      batch-property-prefetch: true
      fast-property: true
      force-index: false
    graph:
      graphname: test-graph
      replace-instance-if-exists: true
    ids:
      block-size: 100000000

  janusGraphConfig:
    storage:
      backend: "com.company.department.diskstorage.cassandra.CompanyCassandraStoreManager"
      batch-loading: true
    query:
      batch: true
      batch-property-prefetch: true
      fast-property: true
      force-index: false
    graph:
      graphname: test-graph
      replace-instance-if-exists: true
    ids:
      block-size: 100000000

Bo•2y ago

Before you call ConfiguredGraphFactory..., do this:

JanusGraphManager gm = new JanusGraphManager(new Settings());

JanusGraphManager gm = new JanusGraphManager(new Settings());

You don't really need gm instance though - it's designed for JanusGraph server. Using JanusGraph as a library gives you more flexibility. So alternatively, you could just manage the graphs by yourself and use JanusGraphFactory.open(config) with different config to open different graphs. ConfiguredGraphFactory essentially does the same thing, except that it also needs to persist the graph configs.

deepak8347OP•2y ago

Creating JanusGraphManager this way solved the issue. I thought that we can create two dynamic graphs in the same keyspace, but that is not the case right ?

Bo•2y ago

Glad to hear it worked. No we don't do that. One graph per keyspace is the way to isolate different graphs.

deepak8347OP•2y ago

Thanks for answering, this helped!!

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Multiple Graphs with Embedded JanusGraph