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.SubAllocator

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NativeAllocator(NativePool pool)

Method Summary

Modifier and Type	Method and Description
long	allocate(int size, OpOrder.Group opGroup)
DecoratedKey	clone(DecoratedKey key, OpOrder.Group writeOp)
Row.Builder	rowBuilder(OpOrder.Group opGroup)
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

rowBuilder

public Row.Builder rowBuilder(OpOrder.Group opGroup)

Specified by:

rowBuilder in class MemtableAllocator

clone

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

Specified by:

clone 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