NativeMap (Apache Accumulo Tablet Server 2.1.0 API)

java.lang.Object
- org.apache.accumulo.tserver.NativeMap

All Implemented Interfaces:

Iterable<Map.Entry<Key,Value>>
```
public class NativeMap
extends Object
implements Iterable<Map.Entry<Key,Value>>
```
This class stores data in a C++ map. Doing this allows us to store more in memory and avoid pauses caused by Java GC. The strategy for dealing with native memory allocated for the native map is that java code using the native map should call delete() as soon as it is finished using the native map. When the NativeMap object is garbage collected its native resources will be released if needed. However waiting for java GC would be a mistake for long lived NativeMaps. Long lived objects are not garbage collected quickly, therefore a process could easily use too much memory.

Constructor Summary

Constructors
Constructor Description

NativeMap()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`delete()`
`Value`	`get(Key key)`
`long`	`getMemoryUsed()`
`Iterator<Map.Entry<Key,Value>>`	`iterator()`
`Iterator<Map.Entry<Key,Value>>`	`iterator(Key startKey)`
`void`	`put(Key key, Value value)`
`int`	`size()`
`SortedKeyValueIterator<Key,Value>`	`skvIterator()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

Constructor Detail
- NativeMap
```
public NativeMap()
```

Method Detail

put

public void put(Key key,
                Value value)

get
```
public Value get(Key key)
```

size
```
public int size()
```

getMemoryUsed
```
public long getMemoryUsed()
```

iterator
```
public Iterator<Map.Entry<Key,Value>> iterator()
```
Specified by:

iterator in interface Iterable<Map.Entry<Key,Value>>

iterator

public Iterator<Map.Entry<Key,Value>> iterator(Key startKey)

delete
```
public void delete()
```

skvIterator

public SortedKeyValueIterator<Key,Value> skvIterator()