Package org.apache.hadoop.hdfs.server.common

Interface DataNodeLockManager<T extends AutoCloseDataSetLock>

All Known Implementing Classes:

DataSetLockManager, NoLockManager

public interface DataNodeLockManager<T extends AutoCloseDataSetLock>

Use for manage a set of lock for datanode.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static enum	DataNodeLockManager.LockLevel	Acquire block pool level and volume level lock first if you want to acquire dir lock.

Method Summary

Modifier and Type	Method	Description
void	addLock(DataNodeLockManager.LockLevel level, String... resources)	Add a lock to LockManager.
void	hook()	LockManager may need to back hook.
T	readLock(DataNodeLockManager.LockLevel level, String... resources)	Acquire readLock and then lock.
void	removeLock(DataNodeLockManager.LockLevel level, String... resources)	Remove a lock from LockManager.
T	writeLock(DataNodeLockManager.LockLevel level, String... resources)	Acquire writeLock and then lock.

Method Details

readLock

T readLock(DataNodeLockManager.LockLevel level,
 String... resources)

Acquire readLock and then lock.

writeLock

T writeLock(DataNodeLockManager.LockLevel level,
 String... resources)

Acquire writeLock and then lock.

addLock

void addLock(DataNodeLockManager.LockLevel level,
 String... resources)

Add a lock to LockManager.

removeLock

void removeLock(DataNodeLockManager.LockLevel level,
 String... resources)

Remove a lock from LockManager.

hook

void hook()

LockManager may need to back hook.