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Docker Image for Tinkerpop Rexster Service on Titan

Titan is a free, open source database that is capable of processing
extremely large graphs and it supports a variety of indexing and storage backends,
which makes it easier to extend than some popular NoSQL Graph databases.

This docker image instantiaties a Titan graph database that is capable of
integrating with an ElasticSearch container (Indexing) and a Cassandra container (Storage).

The default distribution of Titan runs on a single node, so I thought it would be helpful
if there was a modular way at runtime to hook up Titan to its dependencies.

Enter Docker. Now it is possible to run Titan and it's dependencies in separate Docker containers.

Titan

This container is using Titan 0.5.4. Please refer to
its page for more information.

Tinkerpop and Rexster

Tinkerpop is a vendor-independent API specification for
manipulating and access Graph databases.

Rexster is a service that provides protocols
for accessing a graph database. Currently it supports two protocols:

- REST over HTTP: Human-readable and good for testing
- RexPro: Binary Protocol for performence

If you'd like to avoid vendor lock-in, then I'd recommend using Rexster as the API
for accessing your Graph database. It has support for popular graph databases,
so you can avoid refactoring your code. Take a look at Tinkerpop Gremlin for a
Groovy-DSL for querying graphs to see how RexPro and Gremlin provide syntactical
elegance to query graphs.

Running

The minimum system requirements for this stack is 1 GB with 2 cores.

docker run -d --name es1 dockerfile/elasticsearch
docker run -d --name cs1 poklet/cassandra
docker run -d -P --name mytitan --link es1:elasticsearch --link cs1:cassandra apobbati/titan-rexster

Ports

8182: HTTP port for REST API

8183: RexPro for native access (Binary protocol)

8184: JMX Port (You won't need to use this, probably)

You can read more about it in the Rexster documentation.

To test out the REST API (over Boot2docker):

curl http://localhost:<port-mapped-to-8182>/graphs/graph/vertices

Dependencies

I've tested this container with the following containers:

- poklet/cassandra: This is the Cassandra Storage backend for Titan. It scales well for large datasets.
- dockerfile/elasticsearch: This is the ElasticSearch Indexing backend for Titan. It provides search
    capabilities for Titan graph datasets.

Roadmap

In the near future, I'd like to add support for:

- Scaling/Clustering Cassandra and ElasticSearch backends.
- External volumes for persistent data.
- Security between Titan and its backends.
- Example application stack integrating with Titan.
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gschmutz
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