org.apache.cassandra.utils.memory

Class NativeAllocator

java.lang.Object

org.apache.cassandra.utils.memory.MemtableAllocator

org.apache.cassandra.utils.memory.NativeAllocator

public class NativeAllocator
extends MemtableAllocator

This NativeAllocator uses global slab allocation strategy with slab size that scales exponentially from 8kb to 1Mb to serve allocation of up to 128kb.

The slab allocation reduces heap fragmentation from small long-lived objects.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.utils.memory.MemtableAllocator

MemtableAllocator.DataReclaimer, MemtableAllocator.SubAllocator

Field Summary

Fields inherited from class org.apache.cassandra.utils.memory.MemtableAllocator

NO_OP

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NativeAllocator(NativePool pool)

Method Summary

Methods

Modifier and Type	Method and Description
long	allocate(int size, OpOrder.Group opGroup)
Cell	clone(Cell cell, CFMetaData cfm, OpOrder.Group writeOp)
CounterCell	clone(CounterCell cell, CFMetaData cfm, OpOrder.Group writeOp)
DecoratedKey	clone(DecoratedKey key, OpOrder.Group writeOp)
DeletedCell	clone(DeletedCell cell, CFMetaData cfm, OpOrder.Group writeOp)
ExpiringCell	clone(ExpiringCell cell, CFMetaData cfm, OpOrder.Group writeOp)
MemtableAllocator.DataReclaimer	reclaimer()
void	setDiscarded() Indicate the memory and resources owned by this allocator are no longer referenced, and can be reclaimed/reused.

Methods inherited from class org.apache.cassandra.utils.memory.MemtableAllocator

isLive, offHeap, onHeap, setDiscarding

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NativeAllocator

protected NativeAllocator(NativePool pool)

Method Detail

clone

public Cell clone(Cell cell,
         CFMetaData cfm,
         OpOrder.Group writeOp)

Specified by:

clone in class MemtableAllocator

clone

public CounterCell clone(CounterCell cell,
                CFMetaData cfm,
                OpOrder.Group writeOp)

Specified by:

clone in class MemtableAllocator

clone

public DeletedCell clone(DeletedCell cell,
                CFMetaData cfm,
                OpOrder.Group writeOp)

Specified by:

clone in class MemtableAllocator

clone

public ExpiringCell clone(ExpiringCell cell,
                 CFMetaData cfm,
                 OpOrder.Group writeOp)

Specified by:

clone in class MemtableAllocator

clone

public DecoratedKey clone(DecoratedKey key,
                 OpOrder.Group writeOp)

Specified by:

clone in class MemtableAllocator

reclaimer

public MemtableAllocator.DataReclaimer reclaimer()

Specified by:

reclaimer in class MemtableAllocator

allocate

public long allocate(int size,
            OpOrder.Group opGroup)

setDiscarded

public void setDiscarded()

Description copied from class: MemtableAllocator

Indicate the memory and resources owned by this allocator are no longer referenced, and can be reclaimed/reused.

Overrides:

setDiscarded in class MemtableAllocator