Package org.apache.flink.runtime.state.heap

This package contains the classes for key/value state backends that store the state on the JVM heap as objects.

Interface Summary

Interface	Description
HeapPriorityQueueElement	Interface for objects that can be managed by a HeapPriorityQueue.
KeyGroupPartitionedPriorityQueue.PartitionQueueSetFactory<T,PQS extends InternalPriorityQueue<T> & HeapPriorityQueueElement>	Factory that produces the sub-queues that represent the partitions of a KeyGroupPartitionedPriorityQueue.

Class Summary

Class	Description
AbstractHeapPriorityQueue<T extends HeapPriorityQueueElement>	Abstract base class for heap (object array) based implementations of priority queues, with support for fast deletes via HeapPriorityQueueElement.
AbstractHeapPriorityQueueElement	Abstract base class for HeapPriorityQueueElement.
AbstractHeapState<K,N,SV>	Base class for partitioned State implementations that are backed by a regular heap hash map.
CopyOnWriteStateMap<K,N,S>	Implementation of Flink's in-memory state maps with copy-on-write support.
CopyOnWriteStateMap.StateMapEntry<K,N,S>	One entry in the CopyOnWriteStateMap.
CopyOnWriteStateMapSnapshot<K,N,S>	This class represents the snapshot of a CopyOnWriteStateMap.
CopyOnWriteStateTable<K,N,S>	This implementation of StateTable uses CopyOnWriteStateMap.
CopyOnWriteStateTableSnapshot<K,N,S>	This class represents the snapshot of a CopyOnWriteStateTable and has a role in operator state checkpointing.
HeapKeyedStateBackend<K>	A AbstractKeyedStateBackend that keeps state on the Java Heap and will serialize state to streams provided by a CheckpointStreamFactory upon checkpointing.
HeapKeyedStateBackendBuilder<K>	Builder class for HeapKeyedStateBackend which handles all necessary initializations and clean ups.
HeapKeyValueStateIterator	A KeyValueStateIterator over Heap backend snapshot resources.
HeapPriorityQueue<T extends HeapPriorityQueueElement>	Basic heap-based priority queue for HeapPriorityQueueElement objects.
HeapPriorityQueueSet<T extends HeapPriorityQueueElement>	A heap-based priority queue with set semantics, based on HeapPriorityQueue.
HeapPriorityQueueSetFactory	Factory for HeapPriorityQueueSet.
HeapPriorityQueueSnapshotRestoreWrapper<T extends HeapPriorityQueueElement>	This wrapper combines a HeapPriorityQueue with backend meta data.
HeapPriorityQueueStateSnapshot<T>	This class represents the snapshot of an HeapPriorityQueueSet.
HeapRestoreOperation<K>	Implementation of heap restore operation.
HeapSavepointRestoreOperation<K>	Implementation of heap savepoint restore operation.
KeyGroupPartitionedPriorityQueue<T,PQ extends InternalPriorityQueue<T> & HeapPriorityQueueElement>	This implementation of InternalPriorityQueue is internally partitioned into sub-queues per key-group and essentially works as a heap-of-heaps.
StateMap<K,N,S>	Base class for state maps.
StateMapSnapshot<K,N,S,T extends StateMap<K,N,S>>	Base class for snapshots of a StateMap.
StateTable<K,N,S>	Base class for state tables.
StateTableByKeyGroupReaders	This class provides a static factory method to create different implementations of StateSnapshotKeyGroupReader depending on the provided serialization format version.