Namesystem (Apache Hadoop HDFS 3.5.0 API)

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, String xattrName)

Remove xAttr from the inode.

void

startSecretManagerIfNecessary()

Methods inherited from interface org.apache.hadoop.hdfs.util.RwLock
hasReadLock, hasReadLock, hasWriteLock, hasWriteLock, readLock, readLock, readLockInterruptibly, readLockInterruptibly, readUnlock, readUnlock, readUnlock, writeLock, writeLock, writeLockInterruptibly, writeLockInterruptibly, writeUnlock, writeUnlock, writeUnlock

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

Method Details
- 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, String xattrName) throws IOException
  
  Remove xAttr from the inode.
  
  Parameters:
  
  id -
  
  xattrName -
  
  Throws:
  
  IOException
- checkAndProvisionSnapshotTrashRoots
  
  void checkAndProvisionSnapshotTrashRoots()
  
  Check if snapshot roots are created for all existing snapshottable directories. Create them if not.