org.apache.hadoop.fs.viewfs

Class ViewFileSystemUtil

java.lang.Object

org.apache.hadoop.fs.viewfs.ViewFileSystemUtil

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public final class ViewFileSystemUtil
extends Object

Utility APIs for ViewFileSystem.

Method Summary

Modifier and Type	Method and Description
static Map<org.apache.hadoop.fs.viewfs.ViewFileSystem.MountPoint,FsStatus>	getStatus(FileSystem fileSystem, Path path) Get FsStatus for all ViewFsMountPoints matching path for the given ViewFileSystem.
static boolean	isViewFileSystem(FileSystem fileSystem) Check if the FileSystem is a ViewFileSystem.

Methods inherited from class java.lang.Object

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

Method Detail

isViewFileSystem

public static boolean isViewFileSystem(FileSystem fileSystem)

Check if the FileSystem is a ViewFileSystem.

Parameters:

fileSystem -

Returns:

true if the fileSystem is ViewFileSystem

getStatus

public static Map<org.apache.hadoop.fs.viewfs.ViewFileSystem.MountPoint,FsStatus> getStatus(FileSystem fileSystem,
                                                                                            Path path)
                                                                                     throws IOException

Get FsStatus for all ViewFsMountPoints matching path for the given ViewFileSystem. Say ViewFileSystem has following mount points configured (1) hdfs://NN0_host:port/sales mounted on /dept/sales (2) hdfs://NN1_host:port/marketing mounted on /dept/marketing (3) hdfs://NN2_host:port/eng_usa mounted on /dept/eng/usa (4) hdfs://NN3_host:port/eng_asia mounted on /dept/eng/asia For the above config, here is a sample list of paths and their matching mount points while getting FsStatus Path Description Matching MountPoint "/" Root ViewFileSystem lists all (1), (2), (3), (4) mount points. "/dept" Not a mount point, but a valid (1), (2), (3), (4) internal dir in the mount tree and resolved down to "/" path. "/dept/sales" Matches a mount point (1) "/dept/sales/india" Path is over a valid mount point (1) and resolved down to "/dept/sales" "/dept/eng" Not a mount point, but a valid (1), (2), (3), (4) internal dir in the mount tree and resolved down to "/" path. "/erp" Doesn't match or leads to or over any valid mount points None

Parameters:

fileSystem - - ViewFileSystem on which mount point exists

path - - URI for which FsStatus is requested

Returns:

Map of ViewFsMountPoint and FsStatus

Throws:

IOException