alluxio.worker.block.meta

Class StorageTier

java.lang.Object

alluxio.worker.block.meta.StorageTier

@NotThreadSafe
public final class StorageTier
extends Object

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()

Returns:

the tier ordinal

getTierAlias

public String getTierAlias()

Returns:

the tier alias

getCapacityBytes

public long getCapacityBytes()

Returns:

the capacity (in bytes)

getAvailableBytes

public long getAvailableBytes()

Returns:

the remaining capacity (in bytes)

getDir

@Nullable
public StorageDir getDir(int dirIndex)

Returns a directory for the given index.

Parameters:

dirIndex - the directory index

Returns:

a directory, or null if the directory does not exist

getStorageDirs

public List<StorageDir> getStorageDirs()

Returns:

a list of directories in this tier

getLostStorage

public List<String> getLostStorage()

Returns:

a list of lost storage paths

removeStorageDir

public void removeStorageDir(StorageDir dir)

Removes a directory.

Parameters:

dir - directory to be removed