alluxio.underfs

Interface UfsManager

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

AbstractUfsManager, JobUfsManager, MasterUfsManager, NoopUfsManager, WorkerUfsManager

public interface UfsManager
extends Closeable

A class that manages the UFS used by different services.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	UfsManager.UfsClient Container for a UFS and the URI for that UFS.

Method Summary

Modifier and Type	Method and Description
void	addMount(long mountId, AlluxioURI ufsUri, UnderFileSystemConfiguration ufsConf) Keeps track of a mount id and maps it to its URI in Alluxio and configuration.
UfsManager.UfsClient	get(long mountId) Gets UFS information from the manager if this mount ID exists, or throws exception otherwise.
UfsManager.UfsClient	getJournal(URI location)
UfsManager.UfsClient	getRoot()
void	removeMount(long mountId) Removes the association from a mount id to a UFS instance.

Methods inherited from interface java.io.Closeable

close

Method Detail

addMount

void addMount(long mountId,
              AlluxioURI ufsUri,
              UnderFileSystemConfiguration ufsConf)

Keeps track of a mount id and maps it to its URI in Alluxio and configuration. This is an Alluxio-only operation and no interaction to UFS will be made.

Parameters:

mountId - the mount id

ufsUri - the UFS path

ufsConf - the UFS configuration

removeMount

void removeMount(long mountId)

Removes the association from a mount id to a UFS instance. If the mount id is not known, this is a noop.

Parameters:

mountId - the mount id

get

UfsManager.UfsClient get(long mountId)
                  throws NotFoundException,
                         UnavailableException

Gets UFS information from the manager if this mount ID exists, or throws exception otherwise.

Parameters:

mountId - the mount id

Returns:

the UFS information

Throws:

NotFoundException - if mount id is not found in mount table

UnavailableException - if master is not available to query for mount table

getRoot

UfsManager.UfsClient getRoot()

Returns:

the UFS client associated with root

getJournal

UfsManager.UfsClient getJournal(URI location)

Parameters:

location - the journal location

Returns:

the UFS client associated with journal location