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Titan: Distributed Graph Database
http://titan.thinkaurelius.com

[[https://raw.github.com/thinkaurelius/titan/master/doc/images/titan-globe.png|width=100px]]

Titan 0.y.z

Version 0.3.0 (March 29, 2013)

```xml

com.thinkaurelius.titan
titan-core
0.3.0

```
Tested Compatibility:

  • Cassandra 1.2.2
  • HBase 0.94
  • BerkeleyJE 5.0.73

Features:

  • Geo, numeric range, and full-text indexing supporting multiple index backends
  • Edge Indexing
  • Refactoring of Titan-core for enhanced performance due to selective de-serialization
  • New query optimizer for vertex-centric and graph queries
  • Vertex centric query caching for selective queries
  • InMemoryGraph implementation
  • IdGraph support
  • Relaxed transactional scope requirement for vertices
  • Edge no longer extends Vertex
  • Updated to Kryo 2

Bugfixes:

  • Cassandra Thrift Max-Message-Size issue
  • JMX settings for Titan Server
  • Out-unique edges
  • Modified state in global graph operations
  • see issue tracker for a full list

Version 0.2.1 (March 22, 2013)

```xml

com.thinkaurelius.titan
titan-core
0.2.1

```
Tested Compatibility:

  • Cassandra 1.2.0
  • HBase 0.94
  • BerkeleyJE 5.0.58

Features:

  • Refactored POM into multi-module project
  • Support for global vertex (g.V) and edge (g.E) iteration for cassandra and hbase backends
  • Compatible with Cassandra 1.2.0 for all three storage adapters: embedded, thrift, astyanax
  • Improved HBase adapter:
    • Automatic Master launch for testing
    • Refactored batch mutation and reading
    • Optimized HBase operations
  • Updated to Blueprints 2.3.0
  • Better integration with Rexster Rexpro
  • Automatic directory creation for local storage backends
  • Internal Titan version handling and compatibility checks
  • Added additional performance tests

Bugfixes:

  • Resolved issues around Java 1.7
  • Shutdown error in astyanax adapter
  • Made thrift frame and message size configurable for cassandra adapters
  • see issue tracker for a full list

Special Thanks to:

  • Pavel Yaskevich (xedin)


Version 0.2.0 (December 24, 2012)

```xml

com.thinkaurelius.titan
titan
0.2.0

```
Tested Compatibility:

  • Cassandra 1.1.3 & 1.1.4
  • HBase 0.94.1
  • BerkeleyDB 5.0.58
  • TinkerPop (Blueprints, Gremlin, Rexster) 2.2.0
  • This version is incompatible with the previous version of Titan. Please follow the [[Upgrade Instructions]] to switch to the new version.

Features:

  • Embedded Cassandra: Titan can be embedded with Cassandra, that means, Titan starts a Cassandra node in the same JVM and uses efficient in process communication to store and retrieve data.
  • [[Titan Server]]: Titan comes with a light-weight Gremlin query server.
  • Streamlined configuration settings. Please review the new configuration options if you are upgrading from an older version of Titan.
  • Many small performance improvements throughout the code. Please review the issue tracker and the commit log for more details.

Bugfixes:

  • Fixed edge sorting bug which caused edges to be returned in a random order even when a vertex centric index was defined.
  • Fixed id allocation bug that causes Titan to read the entire row during id allocation which can lead to id allocation failures.
  • Completely refactored diskstorage package for better code quality and performance.
  • Fixed edge caching bug for composite primary keys on edges.
  • Fixed a number of smaller bugs. Please review the issue tracker and the commit log for more details.

Special Thanks to:


Version 0.1.0 (September 7, 2012)

```xml

com.thinkaurelius.titan
titan
0.1.0

```
Tested Compatibility:

  • Cassandra 1.1.3 & 1.1.4
  • HBase 0.94.1
  • BerkeleyDB 5.0.58

Features:

  • The focus of the initial Titan release was on building a stable and robust graph database as well as incorporating community feature suggestions and feedback from early adopters of Titan.

Bugfixes:

  • Fixed concurrency and synchronization issues

Special Thanks to: