org.apache.hadoop.hbase.master.locking

类 LockManager.MasterLock

java.lang.Object

org.apache.hadoop.hbase.master.locking.LockManager.MasterLock

封闭类:

LockManager

public class LockManager.MasterLock
extends Object

Locks on namespace/table/regions. Underneath, uses procedure framework and queues a LockProcedure which waits in a queue until scheduled. Use this lock instead LockManager.remoteLocks() for MASTER ONLY operations for two advantages: - no need of polling on LockProcedure to check if lock was acquired. - Generous timeout for lock preemption (default 10 min), no need to spawn thread for heartbeats. (timeout configuration LockProcedure.DEFAULT_LOCAL_MASTER_LOCKS_TIMEOUT_MS).

构造器概要

构造器

构造器和说明
MasterLock(RegionInfo[] regionInfos, String description)
MasterLock(String namespace, LockType type, String description)
MasterLock(TableName tableName, LockType type, String description)

方法概要

限定符和类型	方法和说明
boolean	acquire() Acquire the lock, waiting indefinitely until the lock is released or the thread is interrupted.
void	release() Release the lock.
String	toString()
boolean	tryAcquire(long timeoutMs) Acquire the lock within a wait time.

从类继承的方法 java.lang.Object

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

构造器详细资料

MasterLock

public MasterLock(String namespace,
                  LockType type,
                  String description)

MasterLock

public MasterLock(TableName tableName,
                  LockType type,
                  String description)

MasterLock

public MasterLock(RegionInfo[] regionInfos,
                  String description)

方法详细资料

acquire

public boolean acquire()
                throws InterruptedException

Acquire the lock, waiting indefinitely until the lock is released or the thread is interrupted.

抛出:

InterruptedException - If current thread is interrupted while waiting for the lock

tryAcquire

public boolean tryAcquire(long timeoutMs)
                   throws InterruptedException

Acquire the lock within a wait time.

参数:

timeoutMs - The maximum time (in milliseconds) to wait for the lock, 0 to wait indefinitely

返回:

True if the lock was acquired, false if waiting time elapsed before the lock was acquired

抛出:

InterruptedException - If the thread is interrupted while waiting to acquire the lock

release

public void release()

Release the lock. No-op if the lock was never acquired.

toString

public String toString()

覆盖:

toString 在类中 Object