Package org.apache.accumulo.core.spi.fs

Class SpaceAwareVolumeChooser

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 final String	RECOMPUTE_INTERVAL

Constructor Summary

Constructors

Constructor	Description
SpaceAwareVolumeChooser()

Method Summary

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 Details

RECOMPUTE_INTERVAL

public static final String RECOMPUTE_INTERVAL

See Also:

• Constant Field Values

Constructor Details

SpaceAwareVolumeChooser

public SpaceAwareVolumeChooser()

Method Details

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