NativeAllocator (apache-cassandra API)

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 Description

protected NativeAllocator(NativePool pool)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`long`	`allocate(int size, OpOrder.Group opGroup)`
`DecoratedKey`	`clone(DecoratedKey key, OpOrder.Group writeOp)`
`EnsureOnHeap`	`ensureOnHeap()`
`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
  - ensureOnHeap
```
public EnsureOnHeap ensureOnHeap()
```
    Specified by:
    
    ensureOnHeap 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