Package alluxio.underfs

Interface UfsManager

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable

public interface UfsManager
extends java.io.Closeable

A class that manages the UFS used by different services.

Nested Class Summary

Nested Classes

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

Method Summary

Modifier and Type	Method	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.
void	addMountWithRecorder(long mountId, AlluxioURI ufsUri, UnderFileSystemConfiguration ufsConf, Recorder recorder)	Keeps track of a mount id and maps it to its URI in Alluxio and configuration and records the execution process.
UfsManager.UfsClient	get(long mountId)	Gets UFS information from the manager if this mount ID exists, or throws exception otherwise.
UfsManager.UfsClient	getJournal(java.net.URI location)
UfsManager.UfsClient	getRoot()
boolean	hasMount(long mountId)	Checks if a mountId exists.
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

addMountWithRecorder

void addMountWithRecorder(long mountId,
                          AlluxioURI ufsUri,
                          UnderFileSystemConfiguration ufsConf,
                          Recorder recorder)

Keeps track of a mount id and maps it to its URI in Alluxio and configuration and records the execution process. 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

recorder - recorder used to record the detailed execution process

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(java.net.URI location)

Parameters:

location - the journal location

Returns:

the UFS client associated with journal location

hasMount

boolean hasMount(long mountId)

Checks if a mountId exists.

Parameters:

mountId - the mountId to check

Returns:

whether the mountId has been occupied