Package org.apache.accumulo.server.fs

Interface VolumeChooser

All Known Implementing Classes:

PerTableVolumeChooser, PreferredVolumeChooser, RandomVolumeChooser, SpaceAwareVolumeChooser

public interface VolumeChooser

Helper used by VolumeManagers to select from a set of Volume URIs. N.B. implementations must be threadsafe. VolumeChooser.equals will be used for internal caching.

Implementations may wish to store configuration in Accumulo's system configuration using the Property.GENERAL_ARBITRARY_PROP_PREFIX. They may also benefit from using per-table configuration using Property.TABLE_ARBITRARY_PROP_PREFIX.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	VolumeChooser.VolumeChooserException

Method Summary

Modifier and Type	Method	Description
String	choose(VolumeChooserEnvironment env, String[] options)	Choose a volume from the provided options.

Method Detail

choose

String choose(VolumeChooserEnvironment env,
              String[] options)
       throws VolumeChooser.VolumeChooserException

Choose a volume from the provided options.

Parameters:

env - the server environment provided by the calling framework

options - the list of volumes to choose from

Returns:

one of the options

Throws:

VolumeChooser.VolumeChooserException - if there is an error choosing (this is a RuntimeException); this does not preclude other RuntimeExceptions from occurring