Janus\Cassandra - Graph does not support transactions

[ldau...@gmail.com]

Using the docker-compose examples from https://github.com/JanusGraph/janusgraph-docker I have been able to spin up a Janus graph w/ elastic search and cassandra as the backend store. Then I have a java program in which I am trying to add Nodes and Edges to graph in a batch fashion. However if I see if I call g.addV nodes are automatically added and if I call g.tx().commit() I get the error "Graph does not support transactions". Is this expected? Is there a way to get Janus and Cassandra to utilize transactions? Sorry if this has been answered before but I have googled this and read much of the doc and there does not seem to be a straight ahead answer to this anywhere that I see.

Luke

configuration = new PropertiesConfiguration(filePath);
try
{
  Cluster cluster = Cluster.open(configuration.getString("gremlin.remote.driver.clusterFile"));
  client = cluster.connect();
}
catch (Exception e)
{
  throw new ConfigurationException(e);
}

// using the remote graph for queries
Graph graph = EmptyGraph.instance();
g = graph.traversal().withRemote(configuration);

final Bindings b = Bindings.instance();
g.addV(b.of(LABEL, "titan")).property(NAME, b.of(NAME, "saturn")).property(AGE, b.of(AGE, 10000)).next();
g.tx().commit();

[Luke Daugherty]

Connecting by Gremlin console I can see:

gremlin> :> graph.features().graph().supportsTransactions()

==>true 

But in the java app this is set to false, so I assume this a client issue, but so far am unsure how to get around it...

[Stephen Mallette]

Remote traversals have a different mode of transaction management:

http://tinkerpop.apache.org/docs/current/reference/#tx-gremlin-server  

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[Abhay Pandit]

I don't think you need to commit your transaction when you are connecting remotely.
You are using ".next()" after query and it will commit your transaction.

Thanks,
Abhay Kumar Pandit

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[Luke Daugherty]

Yea. For some reason this was not clear to me since I was just adding to the graph and not really querying anything, but calling.next() on the objects returned by addV worked. And I have been able to chain them together for batch processing. Thanks.