SpaceAwareVolumeChooser (Apache Accumulo Core 2.1.2 API)

java.lang.Object
- org.apache.accumulo.core.spi.fs.RandomVolumeChooser
- - org.apache.accumulo.core.spi.fs.PreferredVolumeChooser
  - - org.apache.accumulo.core.spi.fs.SpaceAwareVolumeChooser

All Implemented Interfaces:

VolumeChooser
```
public class SpaceAwareVolumeChooser
extends PreferredVolumeChooser
```
A PreferredVolumeChooser that takes remaining HDFS space into account when making a volume choice rather than a simpler round-robin. The list of volumes to use can be limited using the same properties as PreferredVolumeChooser

Since:

2.1.0

Field Summary

Fields
Modifier and Type Field Description

static String RECOMPUTE_INTERVAL

Constructor Summary

Constructors
Constructor Description

SpaceAwareVolumeChooser()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`choose(VolumeChooserEnvironment env, Set<String> options)`	Selects a volume at random from the provided set of volumes.
`protected double`	`getFreeSpace(String uri)`

Methods inherited from class org.apache.accumulo.core.spi.fs.PreferredVolumeChooser
choosable

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

- Field Detail
  - RECOMPUTE_INTERVAL
```
public static final String RECOMPUTE_INTERVAL
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - SpaceAwareVolumeChooser
```
public SpaceAwareVolumeChooser()
```
- Method Detail
  - getFreeSpace
```
protected double getFreeSpace(String uri)
                       throws IOException
```
    Throws:
    
    IOException
  - choose
```
public String choose(VolumeChooserEnvironment env,
                     Set<String> options)
```
    Description copied from class: RandomVolumeChooser
    
    Selects a volume at random from the provided set of volumes. The environment scope is not utilized.
    
    Specified by:
    
    choose in interface VolumeChooser
    
    Overrides:
    
    choose in class PreferredVolumeChooser
    
    Parameters:
    
    env - the server environment provided by the calling framework
    
    options - the list of volumes to choose from
    
    Returns:
    
    a volume from the list of volume options