java.lang.Object
- org.neo4j.gds.core.huge.HugeGraph

All Implemented Interfaces:

BatchNodeIterable, CSRGraph, Degrees, Graph, IdMap, NodeIterator, NodePropertyContainer, PartialIdMap, RelationshipIterator, RelationshipPredicate, RelationshipProperties
```
public class HugeGraph
extends java.lang.Object
implements CSRGraph
```
Huge Graph contains two array like data structures.
The adjacency data is stored in a ByteArray, which is a byte[] addressable by longs indices and capable of storing about 2^46 (~ 70k bn) bytes – or 64 TiB. The bytes are stored in byte[] pages of 32 KiB size.
The data is in the format:
degree ~ targetId₁ ~ targetId₂ ~ targetId_n
The degree is stored as a fill-sized 4 byte long int (the neo kernel api returns an int for Nodes.countAll(org.neo4j.internal.kernel.api.NodeCursor)). Every target ID is first sorted, then delta encoded, and finally written as variable-length vlongs. The delta encoding does not write the actual value but only the difference to the previous value, which plays very nice with the vlong encoding.
The seconds data structure is a LongArray, which is a long[] addressable by longs and capable of storing about 2^43 (~9k bn) longs – or 64 TiB worth of 64 bit longs. The data is the offset address into the aforementioned adjacency array, the index is the respective source node id.
To traverse all nodes, first access to offset from the LongArray, then read 4 bytes into the degree from the ByteArray, starting from the offset, then read degree vlongs as targetId.
Reading the degree from the offset position not only does not require the offset array to be sorted but also allows the adjacency array to be sparse. This fact is used during the import – each thread pre-allocates a local chunk of some pages (512 KiB) and gives access to this data during import. Synchronization between threads only has to happen when a new chunk has to be pre-allocated. This is similar to what most garbage collectors do with TLAB allocations.

See Also:

more abount vlong, more abount TLAB allocation

Nested Class Summary
- Nested classes/interfaces inherited from interface org.neo4j.gds.api.BatchNodeIterable
  BatchNodeIterable.IdIterable, BatchNodeIterable.IdIterator
- Nested classes/interfaces inherited from interface org.neo4j.gds.api.IdMap
  IdMap.NodeLabelConsumer

Field Summary

Fields
Modifier and Type	Field	Description
`protected AdjacencyList`	`adjacency`
`protected boolean`	`hasRelationshipProperty`
`protected IdMap`	`idMap`
`protected boolean`	`isMultiGraph`
`protected java.util.Map<java.lang.String,NodeProperties>`	`nodeProperties`
`protected org.neo4j.gds.Orientation`	`orientation`
`protected @Nullable AdjacencyProperties`	`properties`
`protected long`	`relationshipCount`
`protected org.neo4j.gds.api.schema.GraphSchema`	`schema`

Fields inherited from interface org.neo4j.gds.api.IdMap
NOT_FOUND, START_NODE_ID

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`HugeGraph(IdMap idMap, org.neo4j.gds.api.schema.GraphSchema schema, java.util.Map<java.lang.String,NodeProperties> nodeProperties, long relationshipCount, @NotNull AdjacencyList adjacency, boolean hasRelationshipProperty, double defaultRelationshipPropertyValue, @Nullable AdjacencyProperties relationshipProperty, org.neo4j.gds.Orientation orientation, boolean isMultiGraph)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.Optional<NodeFilteredGraph>`	`asNodeFilteredGraph()`	If this graph is created using a node label filter, this will return a NodeFilteredGraph that represents the node set used in this graph.
`java.util.Set<org.neo4j.gds.NodeLabel>`	`availableNodeLabels()`
`java.util.Set<java.lang.String>`	`availableNodeProperties()`
`java.util.Collection<PrimitiveLongIterable>`	`batchIterables(long batchSize)`
`void`	`canRelease(boolean canRelease)`
`HugeGraph`	`concurrentCopy()`
`boolean`	`contains(long nodeId)`	Returns true iff the nodeId is mapped, otherwise false.
`static HugeGraph`	`create(IdMap nodes, org.neo4j.gds.api.schema.GraphSchema schema, java.util.Map<java.lang.String,NodeProperties> nodeProperties, Relationships.Topology topology, java.util.Optional<Relationships.Properties> maybeRelationshipProperty)`
`int`	`degree(long node)`
`int`	`degreeWithoutParallelRelationships(long nodeId)`	Much slower than just degree() because it may have to look up all relationships.
`boolean`	`exists(long sourceNodeId, long targetNodeId)`	O(n) !
`void`	`forEachNode(java.util.function.LongPredicate consumer)`	Iterate over each nodeId
`void`	`forEachNodeLabel(long nodeId, IdMap.NodeLabelConsumer consumer)`
`void`	`forEachRelationship(long nodeId, double fallbackValue, RelationshipWithPropertyConsumer consumer)`	Calls the given consumer function for every relationship of a given node.
`void`	`forEachRelationship(long nodeId, RelationshipConsumer consumer)`	Calls the given consumer function for every relationship of a given node.
`boolean`	`hasLabel(long nodeId, org.neo4j.gds.NodeLabel label)`
`boolean`	`hasRelationshipProperty()`
`long`	`highestNeoId()`
`IdMap`	`idMap()`
`boolean`	`isMultiGraph()`	Whether the graph is guaranteed to have no parallel relationships.
`boolean`	`isUndirected()`
`long`	`nodeCount()`	Number of mapped nodeIds.
`PrimitiveLongIterator`	`nodeIterator()`
`java.util.List<org.neo4j.gds.NodeLabel>`	`nodeLabels(long nodeId)`
`java.util.Map<java.lang.String,NodeProperties>`	`nodeProperties()`
`NodeProperties`	`nodeProperties(java.lang.String propertyKey)`	Return the property values for a property key NOTE: Avoid using this on the hot path, favor caching the NodeProperties object when possible
`long`	`relationshipCount()`
`double`	`relationshipProperty(long sourceNodeId, long targetNodeId)`	Returns the property value for a relationship defined by its source and target nodes.
`double`	`relationshipProperty(long sourceId, long targetId, double fallbackValue)`	get value of property on relationship between source and target node id
`Relationships`	`relationships()`
`java.util.Map<org.neo4j.gds.RelationshipType,Relationships.Topology>`	`relationshipTopologies()`
`Relationships.Topology`	`relationshipTopology()`
`Graph`	`relationshipTypeFilteredGraph(java.util.Set<org.neo4j.gds.RelationshipType> relationshipTypes)`
`void`	`releaseProperties()`	Release only the properties associated with that graph.
`void`	`releaseTopology()`	Release only the topological data associated with that graph.
`IdMap`	`rootIdMap()`	Returns the original node mapping if the current node mapping is filtered, otherwise it returns itself.
`java.util.OptionalLong`	`rootNodeCount()`	Number of mapped node ids in the root mapping.
`org.neo4j.gds.api.schema.GraphSchema`	`schema()`
`java.util.stream.Stream<RelationshipCursor>`	`streamRelationships(long nodeId, double fallbackValue)`
`long`	`toMappedNodeId(long nodeId)`	Map original nodeId to inner nodeId
`long`	`toOriginalNodeId(long nodeId)`	Map inner nodeId back to original nodeId
`long`	`toRootNodeId(long nodeId)`	Maps an internal id to its root internal node id.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.neo4j.gds.api.Graph
isEmpty, release

Methods inherited from interface org.neo4j.gds.api.IdMap
safeToMappedNodeId, withFilteredLabels

- Field Detail
  - idMap
```
protected final IdMap idMap
```
  - schema
```
protected final org.neo4j.gds.api.schema.GraphSchema schema
```
  - nodeProperties
```
protected final java.util.Map<java.lang.String,NodeProperties> nodeProperties
```
  - orientation
```
protected final org.neo4j.gds.Orientation orientation
```
  - relationshipCount
```
protected final long relationshipCount
```
  - adjacency
```
protected AdjacencyList adjacency
```
  - properties
```
@Nullable
protected @Nullable AdjacencyProperties properties
```
  - hasRelationshipProperty
```
protected final boolean hasRelationshipProperty
```
  - isMultiGraph
```
protected final boolean isMultiGraph
```
- Constructor Detail
  - HugeGraph
```
protected HugeGraph(IdMap idMap,
                    org.neo4j.gds.api.schema.GraphSchema schema,
                    java.util.Map<java.lang.String,NodeProperties> nodeProperties,
                    long relationshipCount,
                    @NotNull
                    @NotNull AdjacencyList adjacency,
                    boolean hasRelationshipProperty,
                    double defaultRelationshipPropertyValue,
                    @Nullable
                    @Nullable AdjacencyProperties relationshipProperty,
                    org.neo4j.gds.Orientation orientation,
                    boolean isMultiGraph)
```
- Method Detail
  - create
```
public static HugeGraph create(IdMap nodes,
                               org.neo4j.gds.api.schema.GraphSchema schema,
                               java.util.Map<java.lang.String,NodeProperties> nodeProperties,
                               Relationships.Topology topology,
                               java.util.Optional<Relationships.Properties> maybeRelationshipProperty)
```
  - nodeCount
```
public long nodeCount()
```
    Description copied from interface: IdMap
    
    Number of mapped nodeIds.
    
    Specified by:
    
    nodeCount in interface IdMap
  - rootNodeCount
```
public java.util.OptionalLong rootNodeCount()
```
    Description copied from interface: PartialIdMap
    
    Number of mapped node ids in the root mapping. This is necessary for nested (filtered) id mappings.
    
    Specified by:
    
    rootNodeCount in interface PartialIdMap
  - highestNeoId
```
public long highestNeoId()
```
    Specified by:
    
    highestNeoId in interface IdMap
  - idMap
```
public IdMap idMap()
```
  - rootIdMap
```
public IdMap rootIdMap()
```
    Description copied from interface: IdMap
    
    Returns the original node mapping if the current node mapping is filtered, otherwise it returns itself.
    
    Specified by:
    
    rootIdMap in interface IdMap
  - schema
```
public org.neo4j.gds.api.schema.GraphSchema schema()
```
    Specified by:
    
    schema in interface Graph
  - nodeProperties
```
public java.util.Map<java.lang.String,NodeProperties> nodeProperties()
```
  - relationshipCount
```
public long relationshipCount()
```
    Specified by:
    
    relationshipCount in interface Graph
    
    Returns:
    
    returns the total number of relationships in the graph.
  - batchIterables
```
public java.util.Collection<PrimitiveLongIterable> batchIterables(long batchSize)
```
    Specified by:
    
    batchIterables in interface BatchNodeIterable
    
    Returns:
    
    a collection of iterables over every node, partitioned by the given batch size.
  - forEachNode
```
public void forEachNode(java.util.function.LongPredicate consumer)
```
    Description copied from interface: NodeIterator
    
    Iterate over each nodeId
    
    Specified by:
    
    forEachNode in interface NodeIterator
  - nodeIterator
```
public PrimitiveLongIterator nodeIterator()
```
    Specified by:
    
    nodeIterator in interface NodeIterator
  - relationshipProperty
```
public double relationshipProperty(long sourceNodeId,
                                   long targetNodeId)
```
    Description copied from interface: RelationshipProperties
    
    Returns the property value for a relationship defined by its source and target nodes.
    
    Specified by:
    
    relationshipProperty in interface RelationshipProperties
  - relationshipProperty
```
public double relationshipProperty(long sourceId,
                                   long targetId,
                                   double fallbackValue)
```
    Description copied from interface: RelationshipProperties
    
    get value of property on relationship between source and target node id
    
    Specified by:
    
    relationshipProperty in interface RelationshipProperties
    
    Parameters:
    
    sourceId - source node
    
    targetId - target node
    
    fallbackValue - value to use if relationship has no property value
    
    Returns:
    
    the property value
  - nodeProperties
```
public NodeProperties nodeProperties(java.lang.String propertyKey)
```
    Description copied from interface: NodePropertyContainer
    
    Return the property values for a property key NOTE: Avoid using this on the hot path, favor caching the NodeProperties object when possible
    
    Specified by:
    
    nodeProperties in interface NodePropertyContainer
    
    Parameters:
    
    propertyKey - the node property key
    
    Returns:
    
    the values associated with that key
  - availableNodeProperties
```
public java.util.Set<java.lang.String> availableNodeProperties()
```
    Specified by:
    
    availableNodeProperties in interface NodePropertyContainer
  - forEachRelationship
```
public void forEachRelationship(long nodeId,
                                RelationshipConsumer consumer)
```
    Description copied from interface: RelationshipIterator
    
    Calls the given consumer function for every relationship of a given node.
    
    Specified by:
    
    forEachRelationship in interface RelationshipIterator
    
    Parameters:
    
    nodeId - id of the node for which to iterate relationships
    
    consumer - relationship consumer function
  - forEachRelationship
```
public void forEachRelationship(long nodeId,
                                double fallbackValue,
                                RelationshipWithPropertyConsumer consumer)
```
    Description copied from interface: RelationshipIterator
    
    Calls the given consumer function for every relationship of a given node. If the graph was loaded with a relationship property, the property value of the relationship will be passed into the consumer. Otherwise the given fallback value will be used.
    
    Specified by:
    
    forEachRelationship in interface RelationshipIterator
    
    Parameters:
    
    nodeId - id of the node for which to iterate relationships
    
    fallbackValue - value used as relationship property if no properties were loaded
    
    consumer - relationship consumer function
  - streamRelationships
```
public java.util.stream.Stream<RelationshipCursor> streamRelationships(long nodeId,
                                                                       double fallbackValue)
```
    Specified by:
    
    streamRelationships in interface RelationshipIterator
  - relationshipTypeFilteredGraph
```
public Graph relationshipTypeFilteredGraph(java.util.Set<org.neo4j.gds.RelationshipType> relationshipTypes)
```
    Specified by:
    
    relationshipTypeFilteredGraph in interface Graph
  - relationshipTopologies
```
public java.util.Map<org.neo4j.gds.RelationshipType,Relationships.Topology> relationshipTopologies()
```
    Specified by:
    
    relationshipTopologies in interface CSRGraph
  - relationshipTopology
```
public Relationships.Topology relationshipTopology()
```
  - degree
```
public int degree(long node)
```
    Specified by:
    
    degree in interface Degrees
  - degreeWithoutParallelRelationships
```
public int degreeWithoutParallelRelationships(long nodeId)
```
    Description copied from interface: Degrees
    
    Much slower than just degree() because it may have to look up all relationships.
    This is not thread-safe, so if this is called concurrently please use RelationshipIterator.concurrentCopy().
    
    Specified by:
    
    degreeWithoutParallelRelationships in interface Degrees
    
    See Also:
    
    Graph.isMultiGraph()
  - toMappedNodeId
```
public long toMappedNodeId(long nodeId)
```
    Description copied from interface: PartialIdMap
    
    Map original nodeId to inner nodeId
    
    Specified by:
    
    toMappedNodeId in interface PartialIdMap
    
    Parameters:
    
    nodeId - must be smaller or equal to the id returned by IdMap.highestNeoId()
  - toOriginalNodeId
```
public long toOriginalNodeId(long nodeId)
```
    Description copied from interface: IdMap
    
    Map inner nodeId back to original nodeId
    
    Specified by:
    
    toOriginalNodeId in interface IdMap
  - toRootNodeId
```
public long toRootNodeId(long nodeId)
```
    Description copied from interface: IdMap
    
    Maps an internal id to its root internal node id. This is necessary for nested (filtered) id mappings. If this mapping is a nested mapping, this method returns the root node id of the parent mapping. For the root mapping this method returns the given node id.
    
    Specified by:
    
    toRootNodeId in interface IdMap
  - contains
```
public boolean contains(long nodeId)
```
    Description copied from interface: IdMap
    
    Returns true iff the nodeId is mapped, otherwise false.
    
    Specified by:
    
    contains in interface IdMap
  - concurrentCopy
```
public HugeGraph concurrentCopy()
```
    Specified by:
    
    concurrentCopy in interface CSRGraph
    
    Specified by:
    
    concurrentCopy in interface Graph
    
    Specified by:
    
    concurrentCopy in interface RelationshipIterator
    
    Returns:
    
    a copy of this iterator that reuses new cursors internally, so that iterations happen independent from other iterations.
  - asNodeFilteredGraph
```
public java.util.Optional<NodeFilteredGraph> asNodeFilteredGraph()
```
    Description copied from interface: Graph
    
    If this graph is created using a node label filter, this will return a NodeFilteredGraph that represents the node set used in this graph. Be aware that it is not guaranteed to contain all relationships of the graph. Otherwise, it will return an empty Optional.
    
    Specified by:
    
    asNodeFilteredGraph in interface Graph
  - exists
```
public boolean exists(long sourceNodeId,
                      long targetNodeId)
```
    O(n) !
    
    Specified by:
    
    exists in interface RelationshipPredicate
  - canRelease
```
public void canRelease(boolean canRelease)
```
    Specified by:
    
    canRelease in interface Graph
  - releaseTopology
```
public void releaseTopology()
```
    Description copied from interface: Graph
    
    Release only the topological data associated with that graph.
    
    Specified by:
    
    releaseTopology in interface Graph
  - releaseProperties
```
public void releaseProperties()
```
    Description copied from interface: Graph
    
    Release only the properties associated with that graph.
    
    Specified by:
    
    releaseProperties in interface Graph
  - isUndirected
```
public boolean isUndirected()
```
    Specified by:
    
    isUndirected in interface Graph
  - isMultiGraph
```
public boolean isMultiGraph()
```
    Description copied from interface: Graph
    
    Whether the graph is guaranteed to have no parallel relationships. If this returns false it still may be parallel-free, but we do not know.
    
    Specified by:
    
    isMultiGraph in interface Graph
    
    Returns:
    
    true iff the graph has maximum one relationship between each pair of nodes.
  - relationships
```
public Relationships relationships()
```
  - hasRelationshipProperty
```
public boolean hasRelationshipProperty()
```
    Specified by:
    
    hasRelationshipProperty in interface Graph
  - nodeLabels
```
public java.util.List<org.neo4j.gds.NodeLabel> nodeLabels(long nodeId)
```
    Specified by:
    
    nodeLabels in interface IdMap
  - forEachNodeLabel
```
public void forEachNodeLabel(long nodeId,
                             IdMap.NodeLabelConsumer consumer)
```
    Specified by:
    
    forEachNodeLabel in interface IdMap
  - availableNodeLabels
```
public java.util.Set<org.neo4j.gds.NodeLabel> availableNodeLabels()
```
    Specified by:
    
    availableNodeLabels in interface IdMap
  - hasLabel
```
public boolean hasLabel(long nodeId,
                        org.neo4j.gds.NodeLabel label)
```
    Specified by:
    
    hasLabel in interface IdMap

Class HugeGraph

Nested Class Summary

Nested classes/interfaces inherited from interface org.neo4j.gds.api.BatchNodeIterable

Nested classes/interfaces inherited from interface org.neo4j.gds.api.IdMap

Field Summary

Fields inherited from interface org.neo4j.gds.api.IdMap

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.neo4j.gds.api.Graph

Methods inherited from interface org.neo4j.gds.api.IdMap

Field Detail

idMap

schema

nodeProperties

orientation

relationshipCount

adjacency

properties

hasRelationshipProperty

isMultiGraph

Constructor Detail

HugeGraph

Method Detail

create

nodeCount

rootNodeCount

highestNeoId

idMap

rootIdMap

schema

nodeProperties

relationshipCount

batchIterables

forEachNode

nodeIterator

relationshipProperty

relationshipProperty

nodeProperties

availableNodeProperties

forEachRelationship

forEachRelationship

streamRelationships

relationshipTypeFilteredGraph

relationshipTopologies

relationshipTopology

degree

degreeWithoutParallelRelationships

toMappedNodeId

toOriginalNodeId

toRootNodeId

contains

concurrentCopy

asNodeFilteredGraph

exists

canRelease

releaseTopology

releaseProperties

isUndirected

isMultiGraph

relationships

hasRelationshipProperty

nodeLabels

forEachNodeLabel

availableNodeLabels

hasLabel