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Please follow these instructions when upgrading from an older Titan release.

Titan 0.y.z

Version 0.4.0 (October 16, 2013)

Data Upgrade

Titan 0.4.0 is incompatible with previous releases. No upgrade process available from previous versions of Titan yet.
Please check the mailing list for updates on the upgrade process.

API TypeMaker Changes

When upgrading code from previous versions of Titan, please note, that the TypeMaker API has changed significantly.
Use ‘makeKey’ and ‘makeLabel’ to define keys and labels respectively instead of ‘makeType’. Those methods expect the name
of the type as the argument. Furthermore, primaryKey() has been renamed to sortKey() and uniqueness has been renamed:

  • For Titan keys:
    • unique() replaces unique(Direction.IN)
    • single() replaces unique(Direction.OUT)
    • use list() to allow multiple properties for the key
  • For Titan labels:
    • oneToMany() replaces unique(Direction.IN)
    • manyToOne() replaces unique(Direction.OUT)
    • oneToOne() replaces unique(Direction.IN).unique(Direction.OUT)

Rexster Server

Rexster Server configuration and dependencies have been moved into the new module titan-rexster and are no longer part of titan-core

Custom Attribute Serializer

The interface has been extended by method to a) verify that the provided value is valid and b) automatically convert the value if possible.
These methods are required which means that any implementation of AttributeSerializer must be updated.

Type Groups

Type Groups have been removed. Use sortKey instead to group under one label or key.

Version 0.3.1 (May 14, 2013)

From 0.3.0

Titan 0.3.1 is compatible with 0.3.0 and no special upgrade is necessary unless Elasticsearch is used as a storage backend. Titan 0.3.1 uses Elasticsearch 0.90.0 whereas Titan 0.3.0 uses Elasticsearch 0.20.6.

If you are using Elasticsearch, please follow the upgrade instructions for Elasticsearch which are summarized as follows:

  • Elasticsearch 0.90.0 is the first stable release based on Lucene 4. We recommend testing the upgrade before doing it in production.
  • Upgrading from 0.20.x requires a full cluster restart.
  • In order to be able to downgrade, stop indexing new data, issue a flush request, do the upgrade and only enable indexing of new data once you are certain that you no longer need to downgrade. Once new data has been indexed, downgrading is no longer possible. To be extra safe, back up your data before upgrading.

Note, that these instructions apply to the Elasticsearch cluster only and not the Titan cluster or the Titan storage cluster.

From prior versions

Titan 0.3.1 is incompatible with earlier versions of Titan. Read below for more information.

Version 0.3.0 (March 29, 2013)

From prior versions

Titan 0.3.0 is incompatible with prior version of Titan. The upgrade process is in development and not yet available.

When upgrading to Titan 0.3.0, please note the following interface changes:

  • In TypeMaker, functional() has been replaced by unique(Direction.OUT). Likewise, functional(boolean) has been replaced by unique(Direction.OUT, UniquenessConsistency), where the argument true corresponds to UniquenessConsistency.LOCK and false corresponds to UniquenessConsistency.NO_LOCK.
  • In TypeMaker, unique() for property keys has been replaced by unique(Direction.IN).
  • In TypeMaker, indexed() takes additional arguments because Titan now supports vertex and edge indexing. Use indexed(Class<? extends Element>) to create a standard index for the key. Use indexed(String,Class<? extends Element>) to create an external index for the key.
  • In TypeMaker, simple() is no longer available. Simply remove it.
  • In TitanFactory, openInMemoryGraph() is no longer available. Instead, use open(Configuration) where the configuration sets storage.backend=inmemory.
  • In AttributeSerializer, writeObjectData() now uses DataOutput to write elements instead of ByteBuffer. A simple replace in any particular implementation of AttributeSerializer should do the trick.

Version 0.2.1 (March 22, 2013)

From Version 0.2.0

No special upgrade necessary. Since 0.2.1 has upgraded to Blueprints 2.3.0, there are some incompatible interface changes. In particular, Graph.startTransaction() has been renamed to Graph.newTransaction(). Please refer to the Blueprints documentation for more information.

From prior versions

Upgrade to 0.2.0 first as described below.

Version 0.2.0 (December 27, 2012)

From Version 0.1.0

  1. Shut down all running instances of Titan. If the storage backend is Cassandra or HBase, do not shut down the respective storage backend but leave it running. So, only terminate the Titan processes.
  2. Create a backup of the storage backend. For BerkeleyDB, simply archive the contents of the storage directory. For Cassandra and HBase, follow the directions for the respective backup functionalities. Store the backup in a secure place.
  3. Download and unzip Titan 0.2.0 on the (or one of the) machines that has been running Titan previously.
  4. Execute the upgrade010to020.sh/bat script in the bin directory of Titan 0.2.0 with the file name of the Titan configuration file (i.e. the argument passed into TitanFactory.open()) as the only argument. Follow the instructions. If asked to confirm the id block size, please ensure that the displayed value matches your configuration. If you did not configure this value, simply enter yes. Ensure that the script completes successfully.
  5. Install Titan 0.2.0 on all machines. Start Titan 0.2.0. Only use the 0.2.0 version of Titan from this point on.

Version 0.1.0 (September 7, 2012)

From Version 0.1-SNAPSHOT

  1. Shut down all running instances of Titan prior to upgrading ALL instances to the current release to avoid data corruption.