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Changelog

Version Compatibility

The JanusGraph project is growing along with the rest of the graph and big data ecosystem and utilized storage and indexing backends. Below are version compatibilities between the various versions of components. For dependent backend systems, different minor versions are typically supported as well. It is strongly encouraged to verify version compatibility prior to deploying JanusGraph.

Although JanusGraph may be compatible with older and no longer supported versions of its dependencies, users are warned that there are possible risks and security exposures with running software that is no longer supported or updated. Please check with the software providers to understand their supported versions. Users are strongly encouraged to use the latest versions of the software.

Version Compatibility Matrix

Currently supported

All currently supported versions of JanusGraph are listed below.

Info

You are currently viewing the documentation page of JanusGraph version 1.1.0. To ensure that the information below is up to date, please double check that this is not an archived version of the documentation.

JanusGraph Storage Version Cassandra HBase Bigtable ScyllaDB Elasticsearch Solr TinkerPop Spark Scala
1.1.z 2 3.11.z, 4.0.z 2.6.z 1.3.0, 1.4.0, 1.5.z, 1.6.z, 1.7.z, 1.8.z, 1.9.z, 1.10.z, 1.11.z, 1.14.z 6.y 6.y, 7.y, 8.y 8.y 3.7.z 3.2.z 2.12.z
1.0.z 2 3.11.z, 4.0.z 2.5.z 1.3.0, 1.4.0, 1.5.z, 1.6.z, 1.7.z, 1.8.z, 1.9.z, 1.10.z, 1.11.z, 1.14.z 5.y 6.y, 7.y, 8.y 8.y 3.7.z 3.2.z 2.12.z

Info

Even so ScyllaDB is marked as N/A prior version 1.0.0 it was actually supported using cql storage option. The only difference is that from version 1.0.0 JanusGraph officially supports ScyllaDB using scylla and cql storage options and have extended test coverage for ScyllaDB.

End-of-Life

The versions of JanusGraph listed below are outdated and will no longer receive bugfixes.

JanusGraph Storage Version Cassandra HBase Bigtable ScyllaDB Elasticsearch Solr TinkerPop Spark Scala
0.1.z 1 1.2.z, 2.0.z, 2.1.z 0.98.z, 1.0.z, 1.1.z, 1.2.z 0.9.z, 1.0.0-preZ, 1.0.0 N/A 1.5.z 5.2.z 3.2.z 1.6.z 2.10.z
0.2.z 1 1.2.z, 2.0.z, 2.1.z, 2.2.z, 3.0.z, 3.11.z 0.98.z, 1.0.z, 1.1.z, 1.2.z, 1.3.z 0.9.z, 1.0.0-preZ, 1.0.0 N/A 1.5-1.7.z, 2.3-2.4.z, 5.y, 6.y 5.2-5.5.z, 6.2-6.6.z, 7.y 3.2.z 1.6.z 2.10.z
0.3.z 2 1.2.z, 2.0.z, 2.1.z, 2.2.z, 3.0.z, 3.11.z 1.0.z, 1.1.z, 1.2.z, 1.3.z, 1.4.z 1.0.0, 1.1.0, 1.1.2, 1.2.0, 1.3.0, 1.4.0 N/A 1.5-1.7.z, 2.3-2.4.z, 5.y, 6.y 5.2-5.5.z, 6.2-6.6.z, 7.y 3.3.z 2.2.z 2.11.z
0.4.z 2 2.1.z, 2.2.z, 3.0.z, 3.11.z 1.2.z, 1.3.z, 1.4.z, 2.1.z N/A N/A 5.y, 6.y 7.y 3.4.z 2.2.z 2.11.z
0.5.z 2 2.1.z, 2.2.z, 3.0.z, 3.11.z 1.2.z, 1.3.z, 1.4.z, 2.1.z 1.3.0, 1.4.0, 1.5.z, 1.6.z, 1.7.z, 1.8.z, 1.9.z, 1.10.z, 1.11.z, 1.14.z N/A 6.y, 7.y 7.y 3.4.z 2.2.z 2.11.z
0.6.z 2 3.0.z, 3.11.z 1.6.z, 2.2.z 1.3.0, 1.4.0, 1.5.z, 1.6.z, 1.7.z, 1.8.z, 1.9.z, 1.10.z, 1.11.z, 1.14.z N/A 6.y, 7.y 7.y, 8.y 3.5.z 3.0.z 2.12.z

Release Notes

Version 1.1.0 (Release Date: November 7, 2024)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>1.1.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:1.1.0"

Tested Compatibility:

  • Apache Cassandra 3.11.10, 4.0.6
  • Apache HBase 2.6.0
  • Oracle BerkeleyJE 7.5.11
  • ScyllaDB 6.2.0
  • Elasticsearch 6.0.1, 6.6.0, 7.17.8, 8.15.3
  • Apache Lucene 8.11.1
  • Apache Solr 8.11.1
  • Apache TinkerPop 3.7.3
  • Java 8, 11

Installed versions in the Pre-Packaged Distribution:

  • Cassandra 4.0.6
  • Elasticsearch 7.14.0

Changes

For more information on features and bug fixes in 1.1.0, see the GitHub milestone:

Assets

Upgrade Instructions

Inlining vertex properties into a Composite Index

Inlining vertex properties into a Composite Index structure can offer significant performance and efficiency benefits. See documentation on how to inline vertex properties into a composite index.

Warning

Important Notes on Compatibility. 1. Backward Incompatibility: Once a JanusGraph instance adopts this new schema feature, it cannot be rolled back to a prior version of JanusGraph. The changes in the schema structure are not compatible with earlier versions of the system. 2. Migration Considerations: It is critical that users carefully plan their migration to this new version, as there is no automated or manual rollback process to revert to an older version of JanusGraph once this feature is used.

BerkeleyJE ability to overwrite arbitrary settings applied at EnvironmentConfig creation

The new namespace storage.berkeleyje.ext now allows to set custom configurations which were not directly exposed by JanusGraph. The full list of possible setting is available inside the Java class com.sleepycat.je.EnvironmentConfig. All configurations values should be specified as String and be formated the same as specified in the official sleepycat documentation. Example: storage.berkeleyje.ext.je.lock.timeout=5000 ms

JSON schema initializer

For simplicity JSON schema initialization options has been added into JanusGraph. See documentation to learn more about JSON schema initialization process.

Batched Queries Enhancement: Introduction of JanusGraphNoOpBarrierVertexOnlyStep

In previous versions, when a query that could benefit from batch-query optimization (multi-query) was executed without a user-defined barrier step, JanusGraph would inject a NoOpBarrierStep by default. This approach allowed batching for edges and properties, which do not gain advantages from multi-query optimization.

Starting with JanusGraph 1.1.0, this behavior has been improved. The system now injects a JanusGraphNoOpBarrierVertexOnlyStep instead of the standard NoOpBarrierStep when no barrier steps are detected. This change ensures that batching is applied exclusively to vertices, which do benefit from batch queries, while excluding edges and properties from the batching process.

If a user explicitly defines a .barrier() step in the query, the system will continue to use the NoOpBarrierStep as expected.

Batch Query Optimizations Now Support Traversals Containing the drop() Step

Starting with JanusGraph 1.1.0, batch optimizations for vertex removal have been introduced in the drop() step and are enabled by default. Previously, any batch optimization would be skipped for queries containing at least one drop() step. However, with this update, such queries are now eligible for batch query optimization (multi-query).

Please note that the LazyBarrierStrategy (a TinkerPop strategy) is disabled for any query that includes at least one drop() step.

To disable the drop() step optimization and maintain the previous behavior, users can set the following configuration: 

query.batch.drop-step-mode=none

Lazy Loading for Relations

The new transaction configuration option is added lazyLoadRelations() which sets lazy-load for all properties and edges of the vertex. If enabled, then ids and values are deserialized upon demand.
When enabled, it can lead to a performance improvement on large-scale read operations, if only certain types of relations are being read from the vertex.
See performance comparison in GitHub PR #4343.

Text predicates support extended for remote connections

The following text predicates can now be used with remote connections:

  • textNotContains
  • textNotContainsFuzzy
  • textNotContainsPrefix
  • textNotContainsRegex
  • textContainsPhrase
  • textNotContainsPhrase
  • textNotFuzzy
  • textNotPrefix
  • textNotRegex
Vertex mutation optimizations

The following improvements are made for adding new vertex or updating vertex properties:

  • Improved operations to detect vertex changes during transaction-commit from O(N) to O(1);
  • Optimizing properties search by key for newly-created vertex;
  • Optimizing previous property/edge search during vertex update;

For more information see GitHub PR #4292

Version 1.0.1 (Release Date: November 6, 2024)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>1.0.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:1.0.1"

Tested Compatibility:

  • Apache Cassandra 3.11.10, 4.0.6
  • Apache HBase 2.5.8
  • Oracle BerkeleyJE 7.5.11
  • ScyllaDB 5.1.4
  • Elasticsearch 6.0.1, 6.6.0, 7.17.8, 8.15.3
  • Apache Lucene 8.11.1
  • Apache Solr 8.11.1
  • Apache TinkerPop 3.7.3
  • Java 8, 11

Installed versions in the Pre-Packaged Distribution:

  • Cassandra 4.0.6
  • Elasticsearch 7.14.0

Changes

For more information on features and bug fixes in 1.0.1, see the GitHub milestone:

Assets

Version 1.0.0 (Release Date: October 21, 2023)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>1.0.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:1.0.0"

Tested Compatibility:

  • Apache Cassandra 3.11.10, 4.0.6
  • Apache HBase 2.5.0
  • Oracle BerkeleyJE 7.5.11
  • ScyllaDB 5.1.4
  • Elasticsearch 6.0.1, 6.6.0, 7.17.8, 8.10.4
  • Apache Lucene 8.11.1
  • Apache Solr 8.11.1
  • Apache TinkerPop 3.7.0
  • Java 8, 11

Note

Google Bigtable was removed from this list because there is no automatic testing in place specifically for that backend. Since the adapter for Bigtable is however just using the HBase adapter, it is also covered by the tests for HBase.

We invite anyone who is interested in the Bigtable storage adapter to help with this by contributing so that the tests for HBase are also automatically executed for Bigtable. More information can be found in this GitHub issue: janusgraph/janusgraph#415.

Installed versions in the Pre-Packaged Distribution:

  • Cassandra 4.0.6
  • Elasticsearch 7.14.0

Changes

For more information on features and bug fixes in 1.0.0, see the GitHub milestone:

Assets

Upgrade Instructions

Upgrade TinkerPop from 3.5.x to 3.7.0 (breaking)

Some packages under gremlin-driver are moved to gremlin-util module. This means you need to change some classnames of serializers, e.g. from org.apache.tinkerpop.gremlin.driver.ser.* to org.apache.tinkerpop.gremlin.util.ser.*. See this for more detail.

GraphSON serializers are renamed, e.g. from org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0 to org.apache.tinkerpop.gremlin.util.ser.GraphSONMessageSerializerV3. See this for more detail.

String vertex ID support (breaking change)

Users now can use custom string vertex ids. See Custom Vertex ID documentation. Prior to this change, JanusGraph automatically casts IDs of string type to long type if possible. Now this auto conversion is disabled. If you have a vertex with ID 1234, g.V("1234") would no longer help you find the vertex - you would have to do g.V(1234) now.

This feature brings about a breaking change to GraphBinary serializer. As such, users who use GraphBinary serialization format must update JanusGraph server and all clients at once, since the change is backward incompatible.

Warning

Even if you don't enable string vertex id feature, you are still impacted as long as you use GraphBinary serializer.

Upgrade of log4j to version 2

This change requires a new log4j configuration. You can find an example configuration in conf/log4j2-server.xml. As a result of the changed configuration format, we clean up all configurations. This could lead to unexpected new log lines. Please open an issue, if you see any unwanted log line.

Note

Log4j is only used for standalone server deployments and JanusGraph testing.

Removal of cassandra-all dependency

JanusGraph had a dependency on cassandra-all only for some Hadoop-related classes. We moved these few classes into a new module cassandra-hadoop-util to reduce the dependencies of JanusGraph. If you are running embedded JanusGraph with Cassandra, you have to exclude the cassandra-hadoop-util from janusgraph-cql.

Drop support for HBase 1

We are dropping support for HBase 1.

Drop support for Solr 7

We are dropping support for Solr 7.

Drop support for Gryo MessageSerializer

Support for Gryo MessageSerializer has been dropped in TinkerPop 3.6.0 and we therefore also no longer support it in JanusGraph. GraphBinary is now used as the default MessageSerializer.

Remove support for old serialization format of JanusGraph predicates

We are dropping support for old serialization format of JanusGraph predicates. The old predicates serialization format is only used by client older than 0.6. The change only affects GraphSON.

Allow removal of configuration keys

Users can now remove configuration keys in the ConfiguredGraphFactory's configuration:

ConfiguredGraphFactory.removeConfiguration("<graph_name>", Collections.singleton("<config_key>"))

Or the global configuration: 

mgmt = graph.openManagement()
mgmt.remove("<config_key>")
mgmt.commit()

Note that the above commands should be used with care. They cannot be used to drop an external index backend if it has mixed indexes for instance.

New index management

The index management has received an overhaul which enables proper index removal. The schema action REMOVE_INDEX is no longer available and has been replaced by DISCARD_INDEX. See Index Lifecycle documentation for more details.

totals for direct index queries now applies provided offset and limit

Direct index queries which search count for totals (vertexTotals, edgeTotals, propertyTotals and direct execution of IndexProvider.totals) now apply provided limit and offset. Previously provided limit and offset were ignored.
For example, previously the following query would return 500 if there were 500 indexed elements: 

gremlin> graph.indexQuery("textIndex", "v.\"text\":fooBar").limit(10).vertexTotals()

Now the above query will return 10 elements because we limited the result to 10 elements only. Same applies to offset. Previously the following query would return 500 if there were 500 indexed elements:

gremlin> graph.indexQuery("textIndex", "v.\"text\":fooBar").offset(10).vertexTotals()

Now the above query will return 490 as a result because we skip count of the first 10 elements.
offset provided with limit will apply offset first and limit last.
For example, the above query will return 10 elements now if there were 500 indexed elements:

gremlin> graph.indexQuery("textIndex", "v.\"text\":fooBar").limit(10).offset(10).vertexTotals()

The new logic is applied similarly to Direct Index Queries vertexTotals(), edgeTotals(), propertyTotals() as well as internal JanusGraph method IndexProvider.totals.

Add support for Java 11

JanusGraph now officially supports Java 11 in addition to Java 8. We encourage everyone to update to Java 11.

Note

The pre-packaged distribution now requires Java 11.

Batch Processing enabled by default. Configuration changes.

query.batch is now a configuration namespace. Thus, previous query.batch configuration is replaced by query.batch.enabled. query.limit-batch-size configuration option is changed to query.batch.limited.

query.batch-property-prefetch was replaced by a better configurable option. In case previous behaviour is desired then use query.batch.has-step-mode = none as replacement for query.batch-property-prefetch = false or use query.batch.has-step-mode = all_properties as replacement for query.batch-property-prefetch = true.

query.fast-property has no influence on values, properties, valueMap, propertyMap, elementMap anymore when query.batch.enabled is true. By default, those steps are configured to fetch only required properties (with separate query per property), but the behaviour can be changed with the configuration query.batch.properties-mode. In case previous behavior is desired, use query.batch.properties-mode = required_properties_only for query.fast-property = false or use query.batch.properties-mode = all_properties for query.fast-property = true.

label step now uses pre-fetching strategy by default. Use query.batch.label-step-mode = none to disable pre-fetching optimization for label step.

Batch processing allows JanusGraph to fetch a batch of vertices from the storage backend together instead of requesting each vertex individually which leads to a high number of backend queries. This was however disabled by default in JanusGraph because these batches could become much larger than what was needed for the traversal and therefore have a negative performance impact for some traversals. That is why an improved batch processing mode was added in JanusGraph 0.6.0 that limits the size of these batches retrieved from the storage backend, called Limited Batch Processing. This mode therefore solves the problem of having potentially unlimited batch sizes. That is why we now enable this mode by default as most users should benefit from this limited batch processing.

If you want to continue using JanusGraph without batch processing, then you have to manually disable it by setting query.batch.enabled to false.

The size of the batches can be limited by using barrier() steps if limited batch processing is used (query.batch.limited set to true). A special strategy exists which already inserts barrier() steps by default for some steps, the LazyBarrierStrategy. A new configuration option query.batch.limited-size exists to configure default barrier step size for batch processing for batch cases when LazyBarrierStrategy not applied .barrier step and no user-provided barrier step exists for batchable query part. Notice, that query.batch.limited-size is only used when query.batch.limited is true (default in this version).

Batch registration for nested batch compatible steps is changed for repeat step

Previously any batch compatible steps like out, in, values, etc. would receive vertices for batch registration from all repeat parent steps, but only for their starts in case of multi-nested repeat steps (skipping their subsequent iterations registration). With JanusGraph 1.0.0 batches registration for the subsequent iterations of multi-nested repeat steps are used as well. 

g.V(startVertexId).emit().
    repeat(__.repeat(__.in("connects")).emit()).
    until(__.loops().is(P.gt(2)))
In the example above multi-nested repeat case would not register vertices returned from the inner emit() step for the next outer iteration which would result in sequential calls of in("connects") for next outer iteration. The behaviour is now changed to register these vertices for the next child repeat step start.

The behaviour can be controlled by query.batch.repeat-step-mode configuration option.
In case the old behaviour is preferable then query.batch.repeat-step-mode should be set to starts_only_of_all_repeat_parents.

However, in cases when transaction cache is small and repeat step traverses more than one level deep, it could result for some vertices to be re-fetched again which would mean a waste of operation when it isn't necessary. In such situations closest_repeat_parent mode might be more preferable than all_repeat_parents.
With closest_repeat_parent mode vertices for batch registration will be received from the start of the closest repeat step as well as the end of the closest repeat step (for the next iteration). Any other parent repeat steps will be ignored.

ConfiguredGraphFactory now creates separate indices per graph in Elasticsearch

If the ConfiguredGraphFactory is used together with Elasticsearch as the index backend, then the same Elasticsearch index is used for all graphs (if the same index names were used across different graphs). Now it is possible to let JanusGraph create the index names dynamically by using the graph.graphname if no index.[X].index-name is provided in the template configuration. This is exactly like it was already the case for the CQL keyspace name for example.

Users who don't want to use this feature can simply continue providing the index name via index.[X].index-name in the template configuration.

Mixed index aggregation optimization

A new optimization has been added to compute aggregations (min, max, sum and avg) using mixed index engine (if the aggregation function follows an indexed query). If the index backend is Elasticsearch, a double value is used to hold the result. As a result, aggregations on long numbers greater than 2^53 are approximate. In this case, if the accurate result is essential, the optimization can be disabled by removing the strategy JanusGraphMixedIndexAggStrategy: g.traversal().withoutStrategies(JanusGraphMixedIndexAggStrategy.class).

Add support for ElasticSearch 8

JanusGraph now supports ElasticSearch 8.
Notice, Mapping.PREFIX_TREE mapping is no longer available for Geoshape mappings using new ElasticSearch 8 indices.
Mapping.PREFIX_TREE is still supported in ElasticSearch 6, ElasticSearch 7, Solr, Lucene.
For ElasticSearch the new Geoshape mapping was added Mapping.BKD.
It's recommended to use Mapping.BKD mapping due to better performance characteristics over Mapping.PREFIX_TREE.
The downside of Mapping.BKD is that it doesn't support Circle shapes. Thus, JanusGraph provides BKD Circle processors to convert Circle into other shapes for indexing but use Circle at the storage level. More information about Circle processors available under configuration namespace index.[X].bkd-circle-processor.
ElasticSearch 8 doesn't allow creating new indexes with Mapping.PREFIX_TREE mapping, but the existing indices using Mapping.PREFIX_TREE will work in ElasticSearch 8 after migration. See ElasticSearch 8 migration guide.

Add support for ScyllaDB driver

A new module janusgraph-scylla provides ability to run JanusGraph with ScyllaDB Driver which is an optimized fork version of DataStax Java Driver for ScyllaDB storage backend.
For ScyllaDB storage backend you can use either janusgraph-scylla or janusgraph-cql (which is a general CQL storage driver implementation). That said, it's recommended to use janusgraph-scylla for ScyllaDB due to the provided internal optimizations (more about ScyllaDB driver optimizations can be found here).

Notice that janusgraph-cql and janusgraph-scylla are mutually exclusive. Use only one module at a time and never provide both dependencies in the same classpath. See ScyllaDB Storage Backend documentation for more information about how to make scylla storage.backend options available.

CQL ExecutorService purpose change

Previously CQL ExecutorService was used to control parallelism of both CQL IO operations and results deserialization. Starting from JanusGraph 1.0.0 CQL ExecutorService is now used for CQL results deserialization only. All CQL IO operations are now using internal async approach.
The default pool size is now set to have a value of number of cores multiplied by 2. This ExecutorService is now mandatory and cannot be disabled. The default ExecutorService core pool size is not recommended to be changed as the default value is considered to be optimal unless users want to artificially limit parallelism of CQL results deserialization jobs.

A new multi-query method added into KeyColumnValueStore (affects storage adapters implementations only)

A new method Map<SliceQuery, Map<StaticBuffer, EntryList>> getMultiSlices(MultiKeysQueryGroups<StaticBuffer, SliceQuery> multiKeysQueryGroups, StoreTransaction txh) is added into KeyColumnValueStore which is now preferred for multi-queries (batch queries) with multiple slice queries.
In case a multi-query executes more than one Slice query per multi-query execution then those Slice queries will be grouped per same key sets and the new getMultiSlices query will be executed with groups of different SliceQuery for the same sets of keys.

Notice, if the storage doesn't have multiQuery feature enabled - the method won't be used. Hence, it's not necessary to implement it.

In case storage backend has multiQuery feature enabled, then it is highly recommended to overwrite the default (non-optimized) implementation and optimize this method execution to execute all the slice queries for all the requested keys in the shortest time possible (for example, by using asynchronous programming, slice queries grouping, multi-threaded execution, or any other technique which is efficient for the respective storage adapter).

Added possibility to group multiple slice queries together via CQL storage backend

Starting from JanusGraph 1.0.0 CQL storage implementation now groups queries which fetch properties with Cardinality.SINGLE together into the same CQL query. The behaviour can be disabled by setting configuration storage.cql.grouping.slice-allowed = false.

CQL storage implementation has also ability to group queries of different partition keys together if they belong to the same token range or same replicas set (grouping strategy is available via storage.cql.grouping.keys-class configuration option). This behaviour is disabled by default, but can be enabled via storage.cql.grouping.keys-allowed = true. Please note that enabling the key grouping feature can increase the return size of related queries. This is due to each row in a CQL query, which encompasses grouped keys, needing to return its specific key. Moreover, it could potentially lead to less balanced load on the storage cluster. However, it reduces the amount of CQL queries sent which may positively influence throughput in some cases as well as pricing point of some Serverless deployments. We recommend to benchmark each use-case before enabling keys grouping (storage.cql.grouping.keys-allowed).

Notice, keys grouping (storage.cql.grouping.keys-allowed) can be used only with storage backends which support PER PARTITION LIMIT. As such, this feature can't be used with Amazon Keyspaces because it doesn't support PER PARTITION LIMIT.

Different storage backends may also have restriction set on maximum keys which can be provided via IN operator (which is needed for grouping). It is required to ensure that storage.cql.grouping.keys-limit or storage.cql.grouping.slice-limit is less than or equal to the restriction provided via the storage backend. On ScyllaDB it's possible to configure this restriction using max-partition-key-restrictions-per-query configuration option (default to 100). On AstraDB side it is needed to be asked on AstraDB side to be changed via partition_keys_in_select_failure_threshold and in_select_cartesian_product_failure_threshold threshold configurations (https://docs.datastax.com/en/astra-serverless/docs/plan/planning.html#_cassandra_yaml) which are set to 20 and 25 by default.

See additional properties to control grouping configurations under the namespace storage.cql.grouping.

Removal of deprecated classes/methods/functionalities
Methods
  • JanusGraphIndexQuery.vertices replaced by JanusGraphIndexQuery.vertexStream
  • JanusGraphIndexQuery.edges replaced by JanusGraphIndexQuery.edgeStream
  • JanusGraphIndexQuery.properties replaced by JanusGraphIndexQuery.propertyStream
  • IndexQueryBuilder.vertices replaced by IndexQueryBuilder.vertexStream
  • IndexQueryBuilder.edges replaced by IndexQueryBuilder.edgeStream
  • IndexQueryBuilder.properties replaced by IndexQueryBuilder.propertyStream
  • IndexTransaction.query replaced by IndexTransaction.queryStream
Classes/Interfaces
  • EdgeLabelDefinition class
  • PropertyKeyDefinition class
  • RelationTypeDefinition class
  • SchemaContainer class
  • SchemaElementDefinition class
  • SchemaProvider interface
  • VertexLabelDefinition class
  • JanusGraphId class
  • AllEdgesIterable class
  • AllEdgesIterator class
  • ConcurrentLRUCache class
  • PriorityQueue class
  • RemovableRelationIterable class
  • RemovableRelationIterator class
  • ImmutableConfiguration class

Version 0.6.4 (Release Date: October 14, 2023)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.6.4</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.6.4"

Tested Compatibility:

  • Apache Cassandra 3.0.14, 3.11.10
  • Apache HBase 1.6.0, 2.2.7
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.14.0
  • Apache Lucene 8.9.0
  • Apache Solr 7.7.2, 8.11.0
  • Apache TinkerPop 3.5.7
  • Java 1.8

Changes

For more information on features and bug fixes in 0.6.4, see the GitHub milestone:

Assets

Upgrade Instructions

Default logging library changed to Reload4j

The default logging library used in the pre-packaged distribution has been changed in version 0.6.3 by accident from Log4j to Logback. While this change meant that some security issues of Log4j were avoided, it was also a breaking change that was not intended. This resulted in only warnings being logged by default and also that a Log4j config file was ignored. To fix this breaking change, we change the default logging library in this release to Reload4j which is completely compatible with Log4j, but fixes the security issues of Log4j. This means that Log4j config files will continue to work with this version.

Note that this only applies to JanusGraph 0.6. JanusGraph 1.0.0 uses Log4j2 by default.

Version 0.6.3 (Release Date: February 18, 2023)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.6.3</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.6.3"

Tested Compatibility:

  • Apache Cassandra 3.0.14, 3.11.10
  • Apache HBase 1.6.0, 2.2.7
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.14.0
  • Apache Lucene 8.9.0
  • Apache Solr 7.7.2, 8.11.0
  • Apache TinkerPop 3.5.5
  • Java 1.8

Note

Google Bigtable was removed from this list because there is no automatic testing in place specifically for that backend. Since the adapter for Bigtable is however just using the HBase adapter, it is also covered by the tests for HBase.

We invite anyone who is interested in the Bigtable storage adapter to help with this by contributing so that the tests for HBase are also automatically executed for Bigtable. More information can be found in this GitHub issue: janusgraph/janusgraph#415.

Changes

For more information on features and bug fixes in 0.6.3, see the GitHub milestone:

Assets

Version 0.6.2 (Release Date: May 31, 2022)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.6.2</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.6.2"

Tested Compatibility:

  • Apache Cassandra 3.0.14, 3.11.10
  • Apache HBase 1.6.0, 2.2.7
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.14.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.14.0
  • Apache Lucene 8.9.0
  • Apache Solr 7.7.2, 8.9.0
  • Apache TinkerPop 3.5.3
  • Java 1.8

Changes

For more information on features and bug fixes in 0.6.2, see the GitHub milestone:

Assets

Version 0.6.1 (Release Date: January 18, 2022)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.6.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.6.1"

Tested Compatibility:

  • Apache Cassandra 3.0.14, 3.11.10
  • Apache HBase 1.6.0, 2.2.7
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.14.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.14.0
  • Apache Lucene 8.9.0
  • Apache Solr 7.7.2, 8.9.0
  • Apache TinkerPop 3.5.1
  • Java 1.8

Changes

For more information on features and bug fixes in 0.6.1, see the GitHub milestone:

Assets

Upgrade Instructions

GraphManager changed to JanusGraphManager

A GraphManager is used to instantiate graph instances. JanusGraph Server has used the DefaultGraphManager from TinkerPop for this by default if no other GraphManager was specified in the JanusGraph Server YAML config file. The behavior of this DefaultGraphManager was changed in TinkerPop 3.5.0 which is included in JanusGraph 0.6.0 in how it parses config values, making it impossible to provide comma separated values, e.g., to specify multiple hostnames for the storage backend. The JanusGraphManager does not have this limitation which is why it is now configured as the GraphManager in the JanusGraph Server config files:

[...]
channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
graphManager: org.janusgraph.graphdb.management.JanusGraphManager
graphs: {
  graph: conf/janusgraph-berkeleyje-es.properties
}
[...]

If you however want to continue using the DefaultGraphManager, then you can simply remove the setting again or change it to the TinkerPop GraphManager that has been the default before: org.apache.tinkerpop.gremlin.server.util.DefaultGraphManager.

Version 0.6.0 (Release Date: September 3, 2021)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.6.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.6.0"

Tested Compatibility:

  • Apache Cassandra 3.0.14, 3.11.10
  • Apache HBase 1.6.0, 2.2.7
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.14.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.14.0
  • Apache Lucene 8.9.0
  • Apache Solr 7.7.2, 8.9.0
  • Apache TinkerPop 3.5.3
  • Java 1.8

Changes

For more information on features and bug fixes in 0.6.0, see the GitHub milestone:

Assets

Upgrade Instructions

Experimental support for Amazon Keyspaces

Amazon Keyspaces is a serverless managed Apache Cassandra-compatible database service provided by Amazon. See Deploying on Amazon Keyspaces for more details.

Breaking change for Configuration objects

Prior to JanusGraph 0.6.0, Configuration objects were from the Apache commons-configuration library. To comply with the TinkerPop change, JanusGraph now uses the commons-configuration2 library. A typical usage of configuration object is to create configuration using ConfigurationGraphFactory. Now you would need to use the new configuration2 library. Please refer to the commons-configuration 2.0 migration guide for details. Note that this very likely does not affect gremlin console usage, since the new library is auto-imported, and the basic APIs remain the same. For java code usage, you need to import configuration2 library rather than the old configuration library.

Breaking change for gremlin server configs

scriptEvaluationTimeout is renamed to evaluationTimeout. You can refer to conf/gremlin-server/gremlin-server.yaml for example.

Breaking change for gremlin EventStrategy usage

If you are using EventStrategy, please note that now you need to register it every time you start a new transaction. An example is available at ThreadLocalTxLeakTest::eventListenersCanBeReusedAcrossTx See more background of this breaking change in this pull request.

Disable smart-limit by default and change HARD_MAX_LIMIT

Prior to 0.6.0, smart-limit is enabled by default. It tries to guess a small limit for each graph centric query (e.g. g.V().has("prop", "value")) internally, and if more results are required by user, it queries backend again with a larger limit, and repeats until either results are exhausted or user stops the query. However, this is not the same as paging mechanism. All interim results will be fetched again in next round, making the whole query costly. Even worse, if your data backend does not return results in a consistent order, then some entries might be missing in the final results. Until JanusGraph can fully utilize the paging capacity provided by backends (e.g. Elasticsearch scroll), this option is recommended to be turned off. The exception is when you have a large number of results but you only need a few of them, then enabling smart-limit can reduce latency and memory usage. An example would be:

Iterator<Vertex> iter = graph.traversal().V().has("prop", "value");
while (iter.hasNext()) {
    Vertex v = iter.next();
    if (canStop()) break;
}

Prior to 0.6.0, even if smart-limit is disabled, JanusGraph adds a HARD_MAX_LIMIT that is equivalent to 100,000 to avoid fetching too many results at a time. This limit is now configurable, and by default, it's Integer.MAX_VALUE which can be interpreted as no limit.

Add experimental support for Java 11

We started to work on support for Java 11. We would like to get feedback, if everything is working as expected after upgrading to Java 11.

Removal of LoggingSchemaMaker

The schema.default=logging option is not valid anymore. Use schema.default=default and schema.logging=true options together to make application behaviour unaltered, if you are using LoggingSchemaMaker.

Replacing the server startup script is replaced

The gremlin-server.sh is placed by janusgraph-server.sh. The janusgraph-server.sh brings some new functionality such as easy configuration of Java options using the jvm.options file.

The jvm.options file contains some default configurations for JVM based on Cassandra's JVM configurations, Elasticsearch and the old gremlin-server.sh.

Serialization of JanusGraph predicates has changed

The serialization of JanusGraph predicates has changed in this version for both GraphSON and Gryo. The newest version of the JanusGraph Driver requires a JanusGraph Server version of 0.6.0 and above. The server includes a fallback for clients with an older driver to make the upgrade to version 0.6.0 easier. This means that the server can be upgraded first without having to update all clients at the same time. The fallback will however be removed in a future version of JanusGraph so clients should also be upgraded.

GraphBinary is now supported

GraphBinary is a new binary serialization format from TinkerPop that supersedes Gryo and it will eventually also replace GraphSON. GraphBinary is language independent and has a low serialization overhead which results in an improved performance.

If you want to use GraphBinary, you have to add following to the gremlin-server.yaml after the keyword serializers. This will add the support on the server site. 

    - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1, 
        config: { ioRegistries: [org.janusgraph.graphdb.tinkerpop.JanusGraphIoRegistry] }}
    - { className: org.apache.tinkerpop.gremlin.driver.ser.GraphBinaryMessageSerializerV1, 
        config: { serializeResultToString: true }}

Note

The java driver is the only driver that currently supports GraphBinary, see Connecting to JanusGraph using Java.

Note

Version 1.0.0 moves everything under org.apache.tinkerpop.gremlin.driver.ser package to org.apache.tinkerpop.gremlin.util.ser package.

Note

Version 1.0.0 adds a breaking change to GraphBinary for Geoshape serialization, see the 1.0.0 changelog for more information.

New index selection algorithm

In version 0.6.0, the index selection algorithm has changed. If the number of possible indexes for a query is small enough, the new algorithm will perform an exhaustive search to minimize the number of indexes which need to be queried. The default limit is set to 10. In order to maintain the old selection algorithm regardless of the available indexes, set the key query.index-select-threshold to 0. For more information, see Configuration Reference

Removal of Cassandra Thrift support

Thrift will be completely removed in Cassandra 4. All deprecated Cassandra Thrift backends were removed in JanusGraph 0.6.0. We already added support for CQL in JanusGraph 0.2.0 and we have been encouraging users to switch from Thrift to CQL since version 0.2.1.

This means that the following backends were removed: cassandrathrift, cassandra, astyanax, and embeddedcassandra. Users who still use one of these Thrift backends should migrate to CQL. Our migration guide explains the necessary steps for this. The option to run Cassandra embedded in the same JVM as JanusGraph is however no longer supported with CQL.

Note

The source code for the Thrift backends will be moved into a dedicated repository. While we do not support them any more, users can still use them if they for some reason cannot migrate to CQL.

Drop support for Cassandra 2

With the release of Cassandra 4, the support of Cassandra 2 will be dropped. Therefore, you should upgrade to Cassandra 3 or higher.

Note

Cassandra 3 and higher doesn't support compact storage. If you have activated or never changed the value of storage.cql.storage-compact=true, during the upgrade process you have to ensure your data is correctly migrated.

Introduction of a JanusGraph Server startup class as a replacement for Gremlin Server startup

The gremlin-server.sh and the janusgraph.sh are configured to use the new JanusGraph startup class. This new class introduces a default set of TinkerPop Serializers if no serializers are configured in the gremlin-server.yaml. Furthermore, JanusGraph will log the version of JanusGraph and TinkerPop after a shiny new JanusGraph header.

Note

If you have a custom script to startup JanusGraph, you propably would like to replace the Gremlin Server class with JanusGraph Server class:

org.apache.tinkerpop.gremlin.server.GremlinServer => org.janusgraph.graphdb.server.JanusGraphServer

Drop support for Ganglia metrics

We are dropping Ganglia as we are using dropwizard for metrics. Dropwizard did drop Ganglia in the newest major version.

DataStax cassandra driver upgrade from 3.9.0 to 4.13.0

All DataStax cassandra driver metrics are now disabled by default. To enable DataStax driver metrics you need to provide a list of Session level metrics and / or Node level metrics you want to enable. To provide a list of enabled metrics, you can use the next configuration options: storage.cql.metrics.session-enabled and storage.cql.metrics.node-enabled. Notice, DataStax metrics are enabled only when basic metrics are enabled (i.e. metrics.enabled = true). See configuration references storage.cql.metrics for additional DataStax metrics configuration.

An example configuration which enables some CQL Session level and Node level metrics reporting by JMX: 

metrics.enabled=true
metrics.jmx.enabled=true
metrics.jmx.domain=com.datastax.oss.driver
metrics.jmx.agentid=agent
storage.cql.metrics.session-enabled=bytes-sent,bytes-received,connected-nodes,cql-requests,throttling.delay
storage.cql.metrics.node-enabled=pool.open-connections,pool.available-streams,bytes-sent,cql-messages

See advanced.metrics.session.enabled and advanced.metrics.node.enabled sections in DataStax Metrics Configuration for a complete list of available Session level and Node level metrics.

Due to driver upgrade the next cql configuration options have been removed:

  • local-core-connections-per-host
  • remote-core-connections-per-host
  • local-max-requests-per-connection
  • remote-max-requests-per-connection
  • cluster-name

storage.connection-timeout is now used to control initial connection timeout to CQL storage and not request timeouts. Please, use storage.cql.request-timeout to configure request timeouts instead.

New cql configuration options should be used for upgrade:

  • max-requests-per-connection
  • session-name

storage.cql.local-datacenter is mandatory now and defaults to datacenter1.

See more new cql configuration options in configuration references under storage.cql section.

Automatic configurations of dynamic graph binding

If the JanusGraphManager is configured, dynamic graph binding will be setup automatically, see Dynamic Graphs.

Note

Breaking changes in the config of the gremlin-server.yaml.

Following, classes are removed and have to be replaced by tinkerpop equivalent:

removed class replacement class
org.janusgraph.channelizers.JanusGraphWebSocketChannelizer org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer
org.janusgraph.channelizers.JanusGraphHttpChannelizer org.apache.tinkerpop.gremlin.server.channel.HttpChannelizer
org.janusgraph.channelizers.JanusGraphNioChannelizer org.apache.tinkerpop.gremlin.server.channel.NioChannelizer
org.janusgraph.channelizers.JanusGraphWsAndHttpChannelizer org.apache.tinkerpop.gremlin.server.channel.WsAndHttpChannelizer
Breaking change Lucene and Solr fuzzy predicates

The text predicates text.textFuzzy and text.textContainsFuzzy have been updated in both the Lucene and Solr indexing backends to align with JanusGraph and Elastic. These predicates now inspect the query length to determine the Levenshtein distance, where previously they used the backend's default max distance of 2:

  • 0 for strings of one or two characters (exact match)
  • 1 for strings of three, four or five characters
  • 2 for strings of more than five characters

Change Matrix:

text query previous result new result
ah ah true true
ah ai true false
hop hop true true
hop hap true true
hop hoop true true
hop hooop true false
surprises surprises true true
surprises surprizes true true
surprises surpprises true true
surprises surpprisess false false

Version 0.5.3 (Release Date: December 24, 2020)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.5.3</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.5.3"

Tested Compatibility:

  • Apache Cassandra 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.10, 2.1.5
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.14.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.6.2
  • Apache Lucene 7.0.0
  • Apache Solr 7.0.0
  • Apache TinkerPop 3.4.6
  • Java 1.8

Changes

For more information on features and bug fixes in 0.5.3, see the GitHub milestone:

Assets

Version 0.5.2 (Release Date: May 3, 2020)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.5.2</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.5.2"

Tested Compatibility:

  • Apache Cassandra 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.10, 2.1.5
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.14.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.6.2
  • Apache Lucene 7.0.0
  • Apache Solr 7.0.0
  • Apache TinkerPop 3.4.6
  • Java 1.8

For more information on features and bug fixes in 0.5.2, see the GitHub milestone:

Upgrade Instructions

ElasticSearch index store names cache now enabled for any amount of indexes per store

In JanusGraph version 0.5.0 and 0.5.1 all ElasticSearch index store names are cached for efficient index store name retrieval and the cache is disabled if there are more than 50000 indexes available per index store. From JanusGraph version 0.5.2 index store names cache isn't limited to 50000 but instead can be disabled by using a new added parameter enable_index_names_cache. It is still recommended to disable index store names cache if more than 50000 indexes are used per index store.

Version 0.5.1 (Release Date: March 25, 2020)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.5.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.5.1"

Tested Compatibility:

  • Apache Cassandra 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.10, 2.1.5
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0, 1.14.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.6.1
  • Apache Lucene 7.0.0
  • Apache Solr 7.0.0
  • Apache TinkerPop 3.4.6
  • Java 1.8

For more information on features and bug fixes in 0.5.1, see the GitHub milestone:

Upgrade Instructions

Two Distributed package is splitted into two version

The default version of the distribution package does no longer contain the janusgraph.sh. This includes a packaged version of cassandra and elasticsearch. If you want to have janusgraph.sh, you have to download distribution with the suffix -full.

Gremlin Server distributed with the release uses inmemory storage backend and no search backend by default

Gremlin Server is by default configured for the inmemory storage backend and no search backend when started with bin/gremlin-server.sh.
You can provide configuration for another storage backend and/or search backend by providing a path to the appropriate configuration as a second parameter (./bin/gremlin-server.sh ./conf/gremlin-server/[...].yaml).

Version 0.5.0 (Release Date: March 10, 2020)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.5.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.5.0"

Tested Compatibility:

  • Apache Cassandra 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.10, 2.1.5
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 6.0.1, 6.6.0, 7.6.1
  • Apache Lucene 7.0.0
  • Apache Solr 7.0.0
  • Apache TinkerPop 3.4.6
  • Java 1.8

For more information on features and bug fixes in 0.5.0, see the GitHub milestone:

Upgrade Instructions

Distributed package is renamed

The distribution has no longer the suffix -hadoop2.

Reorder dependency of Hadoop

Hadoop is now a dependency of supported backends. Therefore, MapReduceIndexJobs is now split up into different classes:

Old Function New Function
MapReduceIndexJobs.cassandraRepair CassandraMapReduceIndexJobsUtils.repair
MapReduceIndexJobs.cassandraRemove CassandraMapReduceIndexJobsUtils.remove
MapReduceIndexJobs.cqlRepair CqlMapReduceIndexJobsUtils.repair
MapReduceIndexJobs.cqlRemove CqlMapReduceIndexJobsUtils.remove
MapReduceIndexJobs.hbaseRepair HBaseMapReduceIndexJobsUtils.repair
MapReduceIndexJobs.hbaseRemove HBaseMapReduceIndexJobsUtils.remove

Note

Now, you can easily support for any backend.

Warning

Cassandra3InputFormat is replaced by CqlInputFormat

ElasticSearch: Upgrade from 6.6.0 to 7.6.1 and drop support for 5.x version

The ElasticSearch version has been changed to 7.6.1 which removes support for max-retry-timeout option. That is why this option no longer available in JanusGraph. Users should be aware that by default JanusGraph setups maximum open scroll contexts to maximum value of 2147483647 with the parameter setup-max-open-scroll-contexts for ElasticSearch 7.y. This option can be disabled and updated manually in ElasticSearch but you should be aware that ElasticSearch starting from version 7 has a default limit of 500 opened contexts which most likely be reached by the normal usage of JanusGraph with ElasticSearch. By default deprecated mappings are disabled in ElasticSearch version 7. If you are upgrading your ElasticSearch index backend to version 7 from lower versions, it is recommended to reindex your JanusGraph indices to not use mappings. If you are unable to reindex your indices you may setup parameter use-mapping-for-es7 to true which will tell JanusGraph to use mapping types for ElasticSearch version 7. Due to the drop of support for 5.x version, deprecated multi-type indices are no more supported. Parameter use-deprecated-multitype-index is no more supported by JanusGraph.

BerkeleyDB

BerkeleyDB storage configured with SHARED_CACHE for better memory usage.

Default logging location has changed

If you are using janusgraph.sh to start your instance, the default logging has been changed from log to logs

In-Memory backend moved into dedicated module

The built-in in-memory backend has been moved into a dedicated module. Users who use it for instance in tests, have to explicitly declare it as a dependency:

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-inmemory</artifactId>
    <scope>test</scope>
    <version>0.5.0</version>
</dependency>

implementation 'org.janusgraph:janusgraph-inmemory:0.5.0'

Version 0.4.1 (Release Date: January 14, 2020)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.4.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.4.1"

Tested Compatibility:

  • Apache Cassandra 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.10, 2.1.5
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 5.6.14, 6.0.1, 6.6.0
  • Apache Lucene 7.0.0
  • Apache Solr 7.0.0
  • Apache TinkerPop 3.4.4
  • Java 1.8

For more information on features and bug fixes in 0.4.1, see the GitHub milestone:

Upgrade Instructions

TinkerPop: Upgrade from 3.4.1 to 3.4.4

Adding multiple values in the same query to a new vertex property without explicitly defined type (i.e. using Automatic Schema Maker to create a property type) requires explicit usage of VertexProperty.Cardinality for each call (only for the first query which defines a property) if the VertexProperty.Cardinality is different than VertexProperty.Cardinality.single.

Version 0.4.0 (Release Date: July 1, 2019)

Legacy documentation: https://old-docs.janusgraph.org/0.4.0/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.4.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.4.0"

Tested Compatibility:

  • Apache Cassandra 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.10, 2.1.5
  • Google Bigtable 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.11.0
  • Oracle BerkeleyJE 7.5.11
  • Elasticsearch 5.6.14, 6.0.1, 6.6.0
  • Apache Lucene 7.0.0
  • Apache Solr 7.0.0
  • Apache TinkerPop 3.4.1
  • Java 1.8

For more information on features and bug fixes in 0.4.0, see the GitHub milestone:

Upgrade Instructions

HBase: Upgrade from 1.2 to 2.1

The version of HBase that is included in the distribution of JanusGraph was upgraded from 1.2.6 to 2.1.5. HBase 2.x client is not fully backward compatible with HBase 1.x server. Users who operate their own HBase version 1.x cluster may need to upgrade their cluster to version 2.x. Optionally users may build their own distribution of JanusGraph which includes HBase 1.x from source with the maven flags -Dhbase.profile -Phbase1.

Cassandra: Upgrade from 2.1 to 2.2

The version of Cassandra that is included in the distribution of JanusGraph was upgraded from 2.1.20 to 2.2.13. Refer to the upgrade documentation of Cassandra for detailed instructions to perform this upgrade. Users who operate their own Cassandra cluster instead of using Cassandra distributed together with JanusGraph are not affected by this upgrade. This also does not change the different versions of Cassandra that are supported by JanusGraph (see <> for a detailed list of the supported versions).

BerkeleyDB : Upgrade from 7.4 to 7.5

The BerkeleyDB version has been updated, and it contains changes to the file format stored on disk (see the BerkeleyDB changelog for reference). This file format change is forward compatible with previous versions of BerkeleyDB, so existing graph data stored with JanusGraph can be read in. However, once the data has been read in with the newer version of BerkeleyDB, those files can no longer be read by the older version. Users are encouraged to backup the BerkeleyDB storage directory before attempting to use it with the JanusGraph release.

Solr: Compatible Lucene version changed from 5.0.0 to 7.0.0 in distributed config

The JanusGraph distribution contains a solrconfig.xml file that can be used to configure Solr. The value luceneMatchVersion in this config that tells Solr to behave according to that Lucene version was changed from 5.0.0 to 7.0.0 as that is the default version currently used by JanusGraph. Users should generally set this value to the version of their Solr installation. If the config distributed by JanusGraph is used for an existing Solr installation that used a lower version before (like 5.0.0 from a previous versions of this file), it is highly recommended that a re-indexing is performed.

Version 0.3.3 (Release Date: January 11, 2020)

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.3.3</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.3.3"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.4
  • Google Bigtable 1.0.0, 1.1.2, 1.2.0, 1.3.0, 1.4.0
  • Oracle BerkeleyJE 7.4.5
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.3.3
  • Java 1.8

For more information on features and bug fixes in 0.3.3, see the GitHub milestone:

Version 0.3.2 (Release Date: June 16, 2019)

Legacy documentation: https://old-docs.janusgraph.org/0.3.2/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.3.2</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.3.2"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.4
  • Google Bigtable 1.0.0, 1.1.2, 1.2.0, 1.3.0, 1.4.0
  • Oracle BerkeleyJE 7.4.5
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.3.3
  • Java 1.8

For more information on features and bug fixes in 0.3.2, see the GitHub milestone:

Version 0.3.1 (Release Date: October 2, 2018)

Legacy documentation: https://old-docs.janusgraph.org/0.3.1/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.3.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.3.1"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.4
  • Google Bigtable 1.0.0, 1.1.2, 1.2.0, 1.3.0, 1.4.0
  • Oracle BerkeleyJE 7.4.5
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.3.3
  • Java 1.8

For more information on features and bug fixes in 0.3.1, see the GitHub milestone:

Version 0.3.0 (Release Date: July 31, 2018)

Legacy documentation: https://old-docs.janusgraph.org/0.3.0/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.3.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.3.0"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 1.2.6, 1.3.1, 1.4.4
  • Google Bigtable 1.0.0, 1.1.2, 1.2.0, 1.3.0, 1.4.0
  • Oracle BerkeleyJE 7.4.5
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.3.3
  • Java 1.8

For more information on features and bug fixes in 0.3.0, see the GitHub milestone:

Upgrade Instructions

Important

You should back-up your data prior to attempting an upgrade! Also please note that once an upgrade has been completed you will no longer be able to connect to your graph with client versions prior to 0.3.0.

JanusGraph 0.3.0 implements Schema Constraints which made it necessary to also introduce the concept of a schema version. There is a check to prevent client connections that either expect a different schema version or have no concept of a schema version. To perform an upgrade, the configuration option graph.allow-upgrade=true must be set on each graph you wish to upgrade. The graph must be opened with a 0.3.0 or greater version of JanusGraph since older versions have no concept of graph.storage-version and will not allow for it to be set.

Example excerpt from janusgraph.properties file 

# JanusGraph configuration sample: Cassandra over a socket
#
# This file connects to a Cassandra daemon running on localhost via
# Thrift.  Cassandra must already be started before starting JanusGraph
# with this file.

# This option should be removed as soon as the upgrade is complete. Otherwise if this file
# is used in the future to connect to a different graph it could cause an unintended upgrade.
graph.allow-upgrade=true

gremlin.graph=org.janusgraph.core.JanusGraphFactory

# The primary persistence provider used by JanusGraph.  This is required.
# It should be set one of JanusGraph's built-in shorthand names for its
# standard storage backends (shorthands: berkeleyje, cassandrathrift,
# cassandra, astyanax, embeddedcassandra, cql, hbase, inmemory) or to the
# full package and classname of a custom/third-party StoreManager
# implementation.
#
# Default:    (no default value)
# Data Type:  String
# Mutability: LOCAL
storage.backend=cassandrathrift

# The hostname or comma-separated list of hostnames of storage backend
# servers.  This is only applicable to some storage backends, such as
# cassandra and hbase.
#
# Default:    127.0.0.1
# Data Type:  class java.lang.String[]
# Mutability: LOCAL
storage.hostname=127.0.0.1

If graph.allow-upgrade is set to true on a graph graph.storage-version and graph.janusgraph-version will automatically be upgraded to match the version level of the server, or local client, that is opening the graph. You can verify the upgrade was successful by opening the management API and validating the values of graph.storage-version and graph.janusgraph-version.

Once the storage version has been set you should remove graph.allow-upgrade=true from your properties file and reopen your graph to ensure that the upgrade was successful.

Version 0.2.3 (Release Date: May 21, 2019)

Legacy documentation: https://old-docs.janusgraph.org/0.2.3/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.2.3</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.2.3"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 0.98.24-hadoop2, 1.2.6, 1.3.1
  • Google Bigtable 1.0.0
  • Oracle BerkeleyJE 7.3.7
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.2.9
  • Java 1.8

For more information on features and bug fixes in 0.2.3, see the GitHub milestone:

Version 0.2.2 (Release Date: October 9, 2018)

Legacy documentation: https://old-docs.janusgraph.org/0.2.2/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.2.2</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.2.2"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 0.98.24-hadoop2, 1.2.6, 1.3.1
  • Google Bigtable 1.0.0
  • Oracle BerkeleyJE 7.3.7
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.2.9
  • Java 1.8

For more information on features and bug fixes in 0.2.2, see the GitHub milestone:

Version 0.2.1 (Release Date: July 9, 2018)

Legacy documentation: https://old-docs.janusgraph.org/0.2.1/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.2.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.2.1"

Tested Compatibility:

  • Apache Cassandra 2.1.20, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 0.98.24-hadoop2, 1.2.6, 1.3.1
  • Google Bigtable 1.0.0
  • Oracle BerkeleyJE 7.3.7
  • Elasticsearch 1.7.6, 2.4.6, 5.6.5, 6.0.1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.2.9
  • Java 1.8

For more information on features and bug fixes in 0.2.1, see the GitHub milestone:

Upgrade Instructions

HBase TTL

In JanusGraph 0.2.0, time-to-live (TTL) support was added for HBase storage backend. In order to utilize the TTL capability on HBase, the graph timestamps need to be MILLI. If the graph.timestamps property is not explicitly set to MILLI, the default is MICRO in JanusGraph 0.2.0, which does not work for HBase TTL. Since the graph.timestamps property is FIXED, a new graph needs to be created to make any change of the graph.timestamps property effective.

Version 0.2.0 (Release Date: October 11, 2017)

Legacy documentation: https://old-docs.janusgraph.org/0.2.0/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.2.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.2.0"

Tested Compatibility:

  • Apache Cassandra 2.1.18, 2.2.10, 3.0.14, 3.11.0
  • Apache HBase 0.98.24-hadoop2, 1.2.6, 1.3.1
  • Google Bigtable 1.0.0-pre3
  • Oracle BerkeleyJE 7.3.7
  • Elasticsearch 1.7.6, 2.4.6, 5.6.2, 6.0.0-rc1
  • Apache Lucene 7.0.0
  • Apache Solr 5.5.4, 6.6.1, 7.0.0
  • Apache TinkerPop 3.2.6
  • Java 1.8

For more information on features and bug fixes in 0.2.0, see the GitHub milestone:

Upgrade Instructions

Elasticsearch

JanusGraph 0.1.z is compatible with Elasticsearch 1.5.z. There were several configuration options available, including transport client, node client, and legacy configuration track. JanusGraph 0.2.0 is compatible with Elasticsearch versions from 1.y through 6.y, however it offers only a single configuration option using the REST client.

Transport client

The TRANSPORT_CLIENT interface has been replaced with REST_CLIENT. When migrating an existing graph to JanusGraph 0.2.0, the interface property must be set when connecting to the graph: 

index.search.backend=elasticsearch
index.search.elasticsearch.interface=REST_CLIENT
index.search.hostname=127.0.0.1

After connecting to the graph, the property update can be made permanent by making the change with JanusGraphManagement: 

mgmt = graph.openManagement()
mgmt.set("index.search.elasticsearch.interface", "REST_CLIENT")
mgmt.commit()

Node client

A node client with JanusGraph can be configured in a few ways. If the node client was configured as a client-only or non-data node, follow the steps from the transport client section to connect to the existing cluster using the REST_CLIENT instead. If the node client was a data node (local-mode), then convert it into a standalone Elasticsearch node, running in a separate JVM from your application process. This can be done by using the node’s configuration from the JanusGraph configuration to start a standalone Elasticsearch 1.5.z node. For example, we start with these JanusGraph 0.1.z properties:

index.search.backend=elasticsearch
index.search.elasticsearch.interface=NODE
index.search.conf-file=es-client.yml
index.search.elasticsearch.ext.node.name=alice

where the configuration file es-client.yml has properties:

node.data: true
path.data: /var/lib/elasticsearch/data
path.work: /var/lib/elasticsearch/work
path.logs: /var/log/elasticsearch

The properties found in the configuration file es-client.yml and the index.search.elasticsearch.ext.* properties can be inserted into $ES_HOME/config/elasticsearch.yml so that a standalone Elasticsearch 1.5.z node can be started with the same properties. Keep in mind that if any path locations have relative paths, those values may need to be updated appropriately. Once the standalone Elasticsearch node is started, follow the directions in the transport client section to complete the migration to the REST_CLIENT interface. Note that the index.search.conf-file and index.search.elasticsearch.ext.* properties are not used by the REST_CLIENT interface, so they can be removed from the configuration properties.

Legacy configuration

The legacy configuration track was not recommended in JanusGraph 0.1.z and is no longer supported in JanusGraph 0.2.0. Users should refer to the previous sections and migrate to the REST_CLIENT.

Version 0.1.1 (Release Date: May 11, 2017)

Documentation: https://old-docs.janusgraph.org/0.1.1/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.1.1</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.1.1"

Tested Compatibility:

  • Apache Cassandra 2.1.9
  • Apache HBase 0.98.8-hadoop2, 1.0.3, 1.1.8, 1.2.4
  • Google Bigtable 0.9.5.1
  • Oracle BerkeleyJE 7.3.7
  • Elasticsearch 1.5.1
  • Apache Lucene 4.10.4
  • Apache Solr 5.2.1
  • Apache TinkerPop 3.2.3
  • Java 1.8

For more information on features and bug fixes in 0.1.1, see the GitHub milestone:

Version 0.1.0 (Release Date: April 11, 2017)

Documentation: https://old-docs.janusgraph.org/0.1.0/index.html

<dependency>
    <groupId>org.janusgraph</groupId>
    <artifactId>janusgraph-core</artifactId>
    <version>0.1.0</version>
</dependency>

compile "org.janusgraph:janusgraph-core:0.1.0"

Tested Compatibility:

  • Apache Cassandra 2.1.9
  • Apache HBase 0.98.8-hadoop2, 1.0.3, 1.1.8, 1.2.4
  • Google Bigtable 0.9.5.1
  • Oracle BerkeleyJE 7.3.7
  • Elasticsearch 1.5.1
  • Apache Lucene 4.10.4
  • Apache Solr 5.2.1
  • Apache TinkerPop 3.2.3
  • Java 1.8

Features added since version Titan 1.0.0:

  • TinkerPop 3.2.3 compatibility

    • Includes update to Spark 1.6.1

  • Query optimizations: JanusGraphStep folds in HasId and HasContainers can be folded in even mid-traversal

  • Support Google Cloud Bigtable as a backend over the HBase interface

  • Compatibility with newer versions of backend and index stores

    • HBase 1.2

    • BerkeleyJE 7.3.7

  • Includes a number of bug fixes and optimizations

For more information on features and bug fixes in 0.1.0, see the GitHub milestone:

Upgrade Instructions

JanusGraph is based on the latest commit to the titan11 branch of Titan repo.

JanusGraph has made the following changes to Titan, so you will need to adjust your code and configuration accordingly:

  1. module names: titan-* are now janusgraph-*

  2. package names: com.thinkaurelius.titan are now org.janusgraph

  3. class names: Titan* are now JanusGraph* except in cases where this would duplicate a word, e.g., TitanGraph is simply JanusGraph rather than JanusGraphGraph

For more information on how to configure JanusGraph to read data which had previously been written by Titan refer to Migration from titan.