Unable to drop Remote JanusGraph

[Dipen Jain]

Hi,

I'm looking to drop a graph, but the JanusgraphFactory.drop(graph) doesn't work for me. I'm using JAVA to connect to the remote server and load/remove data.

Using the below properties file  for remote-properties gremlin.remote.remoteConnectionClass=org.apache.tinkerpop.gremlin.driver.remote.DriverRemoteConnection
gremlin.remote.driver.clusterFile=conf/remote-objects.yaml
gremlin.remote.driver.sourceName=g

Below file for remote-objects - 

hosts: [hostname]
port: 8182
serializer: {
className: org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0,
config: {
ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry]
}
}
Using this to open the graph - 
conf = new PropertiesConfiguration(propFileName);

// using the remote graph for queries
graph = JanusGraphFactory.open("inmemory");
g = graph.traversal().withRemote(conf);
return g;

Using this to drop the graph:
if (graph != null) {
LOGGER.info("Dropping janusgraph function");
JanusGraphFactory.drop(getJanusGraph());
}

Any help would be appreciated.
Thanks!

[Nicolas Trangosi]

Hi,

I am able to drop remotely  the graph using the script:

JanusGraphFactory.drop(graph);[]

After the script, I need to restart janusGraph in order to re-create the graph.

Could you sent the janusgraph logs with the stack trace ?

Also, instead of  JanusGraphFactory.drop(getJanusGraph());  , could you try with JanusGraphFactory.drop(graph);

Kind regards,

Nicolas

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[Dipen Jain]

Hi Nicolas,

How do we know if the graph has been dropped? You said you have to restart the server after doing that. I am doing the same, but I don't want to. Is there any way of clearing all the data, the schema without restarting the server.

Also, JanusGraphFactory.drop(getJanusGraph()) is the same as JanusGraphFactory.drop(graph) - because that function passes the same object and it still doesn't work. I don't want to restart the server as it's a remote server. How do I achieve that?

[Nicolas Trangosi]

Hi,

> How do we know if the graph has been dropped?   

As I am using Cassandra and ES as backend, I can see that data as been dropped by doing a direct request to these components.

>   Is there any way of clearing all the data, the schema without restarting the server. 

I have found any yet but I do not look into the gremlin server code.  I do not have this requirement, so I do search for it. May be using a proxy design pattern on graph object may do the trick.

Nicolas

[sparshneel chanchlani]

Try ./janusgraph.sh clean

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[Dipen Jain]

Hi,

I want to do it programmatically like how I mentioned in the post - something which is a gremlin query equivalent.

On Tuesday, July 21, 2020 at 8:21:08 AM UTC-4, sparshneel chanchlani wrote:

Try ./janusgraph.sh clean

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[Dipen Jain]

Hi,

I was using a remote server and using inmemory backend for the remote server - I was still able to query the data, Even after dropping it - the data didn't get removed and I had to restart it.

[Nicolas Trangosi]

Hi,

Have you tried instead of drop the graph, to do a g.V().drop().iterate(). 

Please note, that in this case janusGraph schema would still exist and depending on the backend, this solution can be much longer.

Another solution would be to drop the graph, then replace in global bindings, the graph and the g reference. 

The global bindings are set in org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor and are initialized in org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.getAsBindings(). As the implementation of GraphManager is configurable, it should be possible to develop an extension that allows you to retrieve the global bindings and then replace the  graph and the g reference.