alluxio.master.file.meta

Class FileSystemMasterView

java.lang.Object

alluxio.master.file.meta.FileSystemMasterView

@ThreadSafe
public final class FileSystemMasterView
extends Object

This class exposes a read-only view of FileSystemMaster.

Constructor Summary

Constructors

Constructor and Description
FileSystemMasterView(FileSystemMaster fileSystemMaster) Constructs a view of the FileSystemMaster.

Method Summary

Modifier and Type	Method and Description
List<FileBlockInfo>	getFileBlockInfoList(AlluxioURI path)
long	getFileId(AlluxioURI path) Returns the file id for a given path.
FileInfo	getFileInfo(long fileId) Returns the FileInfo for a given path.
AlluxioURI	getPath(long fileId) Gets the path of a file with the given id.
List<WorkerInfo>	getWorkerInfoList()

Methods inherited from class java.lang.Object

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

Constructor Detail

FileSystemMasterView

public FileSystemMasterView(FileSystemMaster fileSystemMaster)

Constructs a view of the FileSystemMaster.

Parameters:

fileSystemMaster - the file system master

Method Detail

getFileInfo

public FileInfo getFileInfo(long fileId)
                     throws FileDoesNotExistException,
                            AccessControlException,
                            UnavailableException

Returns the FileInfo for a given path. Called via RPC, as well as internal masters.

Parameters:

fileId - the file id to get the FileInfo for

Returns:

the FileInfo for the given file id

Throws:

FileDoesNotExistException - if the file does not exist

AccessControlException - if permission denied

UnavailableException

getFileId

public long getFileId(AlluxioURI path)
               throws AccessControlException,
                      FileDoesNotExistException,
                      UnavailableException

Returns the file id for a given path. If the given path does not exist in Alluxio, the method attempts to load it from UFS.

Parameters:

path - the path to get the file id for

Returns:

the file id for a given path, or -1 if there is no file at that path

Throws:

AccessControlException - if permission checking fails

FileDoesNotExistException - if file does not exist

UnavailableException

getFileBlockInfoList

public List<FileBlockInfo> getFileBlockInfoList(AlluxioURI path)
                                         throws FileDoesNotExistException,
                                                InvalidPathException,
                                                AccessControlException,
                                                UnavailableException

Parameters:

path - the path to get the info for

Returns:

a list of FileBlockInfo for all the blocks of the given file

Throws:

FileDoesNotExistException - if the file does not exist

InvalidPathException - if the path of the given file is invalid

AccessControlException - if permission checking fails

UnavailableException

getPath

public AlluxioURI getPath(long fileId)
                   throws FileDoesNotExistException

Gets the path of a file with the given id.

Parameters:

fileId - the id of the file to look up

Returns:

the path of the file

Throws:

FileDoesNotExistException - raise if the file does not exist

getWorkerInfoList

public List<WorkerInfo> getWorkerInfoList()
                                   throws UnavailableException

Returns:

a list of WorkerInfo objects representing the workers in Alluxio

Throws:

UnavailableException