alluxio.worker.block.meta

Class DefaultStorageTier

java.lang.Object

alluxio.worker.block.meta.DefaultStorageTier

All Implemented Interfaces:

StorageTier

@NotThreadSafe
public final class DefaultStorageTier
extends Object
implements StorageTier

Represents a tier of storage, for example memory or SSD. It serves as a container of StorageDir which actually contains metadata information about blocks stored and space used/available.

Method Summary

Modifier and Type	Method and Description
long	getAvailableBytes()
long	getCapacityBytes()
StorageDir	getDir(int dirIndex) Returns a directory for the given index.
List<String>	getLostStorage()
List<StorageDir>	getStorageDirs()
String	getTierAlias()
int	getTierOrdinal()
static StorageTier	newStorageTier(String tierAlias, boolean isMultiTier) Factory method to create StorageTier.
void	removeStorageDir(StorageDir dir) Removes a directory.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

newStorageTier

public static StorageTier newStorageTier(String tierAlias,
                                         boolean isMultiTier)
                                  throws BlockAlreadyExistsException,
                                         IOException,
                                         WorkerOutOfSpaceException

Factory method to create StorageTier.

Parameters:

tierAlias - the tier alias

isMultiTier - whether this tier is part of a multi-tier setup

Returns:

a new storage tier

Throws:

BlockAlreadyExistsException - if the tier already exists

WorkerOutOfSpaceException - if there is not enough space available

IOException

getTierOrdinal

public int getTierOrdinal()

Specified by:

getTierOrdinal in interface StorageTier

Returns:

the tier ordinal

getTierAlias

public String getTierAlias()

Specified by:

getTierAlias in interface StorageTier

Returns:

the tier alias

getCapacityBytes

public long getCapacityBytes()

Specified by:

getCapacityBytes in interface StorageTier

Returns:

the capacity (in bytes)

getAvailableBytes

public long getAvailableBytes()

Specified by:

getAvailableBytes in interface StorageTier

Returns:

the remaining capacity (in bytes)

getDir

@Nullable
public StorageDir getDir(int dirIndex)

Description copied from interface: StorageTier

Returns a directory for the given index.

Specified by:

getDir in interface StorageTier

Parameters:

dirIndex - the directory index

Returns:

a directory, or null if the directory does not exist

getStorageDirs

public List<StorageDir> getStorageDirs()

Specified by:

getStorageDirs in interface StorageTier

Returns:

a list of directories in this tier

getLostStorage

public List<String> getLostStorage()

Specified by:

getLostStorage in interface StorageTier

Returns:

a list of lost storage paths

removeStorageDir

public void removeStorageDir(StorageDir dir)

Description copied from interface: StorageTier

Removes a directory.

Specified by:

removeStorageDir in interface StorageTier

Parameters:

dir - directory to be removed