JanusGraph + Cassandra Connection Guide

Connection Details

JanusGraph Host: localhost
JanusGraph Port: 17002 (Gremlin Server)
ScyllaDB Host: 127.0.0.1
ScyllaDB Port: 17542 (CQL Proxy)
Keyspace: janusgraph

Authentication

No authentication required (localhost binding only)
Cassandra uses default configuration

Gremlin Console Example

# Connect to Gremlin Server
gremlin> :remote connect tinkerpop.server conf/remote.yaml session

# Basic graph operations
gremlin> g = traversal().withRemote('conf/remote-objects.yaml')
gremlin> g.V().has('name', 'test').values()

Python Client Example

from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
from gremlin_python.process.anonymous_traversal import traversal
from gremlin_python.process.graph_traversal import __

# Connect to JanusGraph
connection = DriverRemoteConnection('ws://localhost:17002/gremlin', 'g')
g = traversal().withRemote(connection)

# Create vertex
v = g.addV('person').property('name', 'john').next()
print(f"Created vertex: {v}")

# Query vertices
people = g.V().hasLabel('person').valueMap().toList()
print(f"People: {people}")

connection.close()

ScyllaDB CQLSH Access

# Connect to ScyllaDB via HAProxy
cqlsh localhost 17542

# Show keyspaces
cqlsh> DESCRIBE KEYSPACES;

# Use janusgraph keyspace  
cqlsh> USE janusgraph;

# Show tables
cqlsh> DESCRIBE TABLES;

Configuration Notes

Storage Backend: ScyllaDB (Cassandra-compatible)
Compression: Enabled (LZ4)
Consistency: ONE (for performance)
Data Directory: /data/adaptai/platform/dbops/data/scylla/ (ScyllaDB data)
Backup: Manual snapshots recommended

Security

❗ Localhost binding only
❗ No authentication on Cassandra
❗ Regular compaction monitoring needed
❗ Backup graph schema regularly

Last Updated: September 4, 2025