org.apache.hadoop.hdfs.server.namenode

Interface Namesystem

All Superinterfaces:

RwLock, SafeMode

All Known Implementing Classes:

FSNamesystem

@InterfaceAudience.Private
public interface Namesystem
extends RwLock, SafeMode

Namesystem operations.

Method Summary

Methods

Modifier and Type	Method and Description
void	adjustSafeModeBlockTotals(int deltaSafe, int deltaTotal)
void	checkOperation(NameNode.OperationCategory read)
void	checkSuperuserPrivilege() Check if the user has superuser privilege.
String	getBlockPoolId()
boolean	isGenStampInFuture(Block block)
boolean	isInStandbyState()
boolean	isRunning() Is this name system running?

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

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

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

checkSafeMode, decrementSafeBlockCount, incrementSafeBlockCount, isInSafeMode, isInStartupSafeMode, isPopulatingReplQueues

Method Detail

isRunning

boolean isRunning()

Is this name system running?

checkSuperuserPrivilege

void checkSuperuserPrivilege()
                             throws AccessControlException

Check if the user has superuser privilege.

Throws:

AccessControlException

getBlockPoolId

String getBlockPoolId()

Returns:

the block pool ID

isInStandbyState

boolean isInStandbyState()

isGenStampInFuture

boolean isGenStampInFuture(Block block)

adjustSafeModeBlockTotals

void adjustSafeModeBlockTotals(int deltaSafe,
                             int deltaTotal)

checkOperation

void checkOperation(NameNode.OperationCategory read)
                    throws StandbyException

Throws:

StandbyException