org.apache.hadoop.hbase.io

接口 HeapSize

所有已知子接口:

SizedCellScanner

所有已知实现类:

HFileContext, KeyValue, KeyValue.KeyOnlyKeyValue, NoTagsKeyValue

@InterfaceAudience.Private
public interface HeapSize

Implementations can be asked for an estimate of their size in bytes.

Useful for sizing caches. Its a given that implementation approximations do not account for 32 vs 64 bit nor for different VM implementations.

An Object's size is determined by the non-static data members in it, as well as the fixed Object overhead.

For example:

 public class SampleObject implements HeapSize {

   int [] numbers;
   int x;
 }
 

方法概要

方法

限定符和类型	方法和说明
long	heapSize()

方法详细资料

heapSize

long heapSize()

返回:

Approximate 'exclusive deep size' of implementing object. Includes count of payload and hosting object sizings.