secrets/dataops/janusgraph_cassandra_connection.md

# 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
```bash
# 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
```python
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
```bash
# 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