Package org.apache.hadoop.hdfs.server.namenode

Interface Namesystem

All Superinterfaces:

RwLock, SafeMode

All Known Implementing Classes:

FSNamesystem

@Private
public interface Namesystem
extends RwLock, SafeMode

Namesystem operations.

Method Summary

Modifier and Type	Method	Description
void	checkAndProvisionSnapshotTrashRoots()	Check if snapshot roots are created for all existing snapshottable directories.
BlockCollection	getBlockCollection(long id)
CacheManager	getCacheManager()
FSDirectory	getFSDirectory()
HAContext	getHAContext()
boolean	inTransitionToActive()
boolean	isInSnapshot(long blockCollectionID)
boolean	isRunning()	Is this name system running?
void	removeXattr(long id, java.lang.String xattrName)	Remove xAttr from the inode.
void	startSecretManagerIfNecessary()

Methods inherited from interface org.apache.hadoop.hdfs.util.RwLock

hasReadLock, hasWriteLock, readLock, readLockInterruptibly, readUnlock, readUnlock, writeLock, writeLockInterruptibly, writeUnlock, writeUnlock

Methods inherited from interface org.apache.hadoop.hdfs.server.namenode.SafeMode

isInSafeMode, isInStartupSafeMode

Method Detail

isRunning

boolean isRunning()

Is this name system running?

getBlockCollection

BlockCollection getBlockCollection(long id)

getFSDirectory

FSDirectory getFSDirectory()

startSecretManagerIfNecessary

void startSecretManagerIfNecessary()

isInSnapshot

boolean isInSnapshot(long blockCollectionID)

getCacheManager

CacheManager getCacheManager()

getHAContext

HAContext getHAContext()

inTransitionToActive

boolean inTransitionToActive()

Returns:

Whether the namenode is transitioning to active state and is in the middle of the starting active services.

removeXattr

void removeXattr(long id,
                 java.lang.String xattrName)
          throws java.io.IOException

Remove xAttr from the inode.

Parameters:

id -

xattrName -

Throws:

java.io.IOException

checkAndProvisionSnapshotTrashRoots

void checkAndProvisionSnapshotTrashRoots()

Check if snapshot roots are created for all existing snapshottable directories. Create them if not.