Package org.apache.arrow.memory

Memory Allocation, Accounting and Management.

See: Description

Interface Summary

Interface	Description
AllocationListener	An allocation listener being notified for allocation/deallocation
AllocationManager.Factory	A factory interface for creating AllocationManager.
AllocationReservation	Supports cumulative allocation reservation.
BufferAllocator	Wrapper class to deal with byte buffer allocation.
BufferManager	Manages a list of ArrowBufs that can be reallocated as needed.
OwnershipTransferResult	The result of transferring an ArrowBuf between BufferAllocators.
ReferenceManager	ReferenceManager is the reference count for one or more allocations.
ReusableBuffer<T>	A lightweight, automatically expanding container for holding byte data.
ValueWithKeyIncluded<K>	Helper interface to generify a value to be included in the map where key is part of the value.

Class Summary

Class	Description
AllocationManager	An AllocationManager is the implementation of a physical memory allocation.
AllocationOutcome	Describes the type of outcome that occurred when trying to account for allocation of memory.
AllocationOutcomeDetails	Captures details of allocation for each accountant in the hierarchical chain.
AllocationOutcomeDetails.Entry	Outcome of the allocation request at one accountant in the hierarchy.
ArrowBuf	ArrowBuf serves as a facade over underlying memory by providing several access APIs to read/write data into a chunk of direct memory.
ArrowByteBufAllocator	Deprecated This class may be removed in a future release.
BoundsChecking	Configuration class to determine if bounds checking should be turned on or off.
BufferLedger	The reference manager that binds an AllocationManager to BufferAllocator and a set of ArrowBuf.
DefaultAllocationManagerFactory	The default Allocation Manager Factory for a module.
DefaultAllocationManagerOption	A class for choosing the default allocation manager.
ForeignAllocation	EXPERIMENTAL: a memory allocation that does not come from a BufferAllocator, but rather an outside source (like JNI).
LowCostIdentityHashMap<K,V extends ValueWithKeyIncluded<K>>	Highly specialized IdentityHashMap that implements only partial Map APIs.
NettyAllocationManager	The default implementation of AllocationManager.
OwnershipTransferNOOP	An OwnershipTransferResult indicating no transfer needed.
RootAllocator	A root allocator for using direct memory for Arrow Vectors/Arrays.
UnsafeAllocationManager	Allocation manager based on unsafe API.

Enum Summary

Enum	Description
AllocationOutcome.Status	Allocation status code.
DefaultAllocationManagerOption.AllocationManagerType	The allocation manager type.

Exception Summary

Exception	Description
AllocatorClosedException	Exception thrown when a closed BufferAllocator is used.
OutOfMemoryException	Indicates memory could not be allocated for Arrow buffers.

Package org.apache.arrow.memory Description

Memory Allocation, Accounting and Management. See the Arrow Java documentation for details: Memory Management