org.apache.hadoop.hbase.master

Class TableLockManager.NullTableLockManager

java.lang.Object

org.apache.hadoop.hbase.master.TableLockManager

org.apache.hadoop.hbase.master.TableLockManager.NullTableLockManager

Enclosing class:

TableLockManager

@InterfaceAudience.Private
public static class TableLockManager.NullTableLockManager
extends TableLockManager

A null implementation

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.master.TableLockManager

TableLockManager.NullTableLockManager, TableLockManager.TableLock

Field Summary

Fields inherited from class org.apache.hadoop.hbase.master.TableLockManager

DEFAULT_TABLE_LOCK_EXPIRE_TIMEOUT_MS, DEFAULT_TABLE_READ_LOCK_TIMEOUT_MS, DEFAULT_TABLE_WRITE_LOCK_TIMEOUT_MS, TABLE_LOCK_ENABLE, TABLE_LOCK_EXPIRE_TIMEOUT, TABLE_READ_LOCK_TIMEOUT_MS, TABLE_WRITE_LOCK_TIMEOUT_MS

Constructor Summary

Constructors

Constructor and Description
NullTableLockManager()

Method Summary

Modifier and Type	Method and Description
TableLockManager.TableLock	readLock(TableName tableName, String purpose) Returns a TableLock for locking the table for shared access among read-lock holders
void	reapAllExpiredLocks() Force releases all table locks(read and write) that have been held longer than "hbase.table.lock.expire.ms".
void	reapWriteLocks() Force releases table write locks and lock attempts even if this thread does not own the lock.
void	tableDeleted(TableName tableName) Called after a table has been deleted, and after the table lock is released.
void	visitAllLocks(InterProcessLock.MetadataHandler handler) Visits all table locks(read and write), and lock attempts with the given callback MetadataHandler.
TableLockManager.TableLock	writeLock(TableName tableName, String purpose) Returns a TableLock for locking the table for exclusive access

Methods inherited from class org.apache.hadoop.hbase.master.TableLockManager

createTableLockManager, fromBytes

Methods inherited from class java.lang.Object

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

Constructor Detail

NullTableLockManager

public NullTableLockManager()

Method Detail

writeLock

public TableLockManager.TableLock writeLock(TableName tableName,
                                            String purpose)

Description copied from class: TableLockManager

Returns a TableLock for locking the table for exclusive access

Specified by:

writeLock in class TableLockManager

Parameters:

tableName - Table to lock

purpose - Human readable reason for locking the table

Returns:

A new TableLock object for acquiring a write lock

readLock

public TableLockManager.TableLock readLock(TableName tableName,
                                           String purpose)

Description copied from class: TableLockManager

Returns a TableLock for locking the table for shared access among read-lock holders

Specified by:

readLock in class TableLockManager

Parameters:

tableName - Table to lock

purpose - Human readable reason for locking the table

Returns:

A new TableLock object for acquiring a read lock

reapAllExpiredLocks

public void reapAllExpiredLocks()
                         throws IOException

Description copied from class: TableLockManager

Force releases all table locks(read and write) that have been held longer than "hbase.table.lock.expire.ms". Assumption is that the clock skew between zookeeper and this servers is negligible. The behavior of the lock holders still thinking that they have the lock is undefined.

Specified by:

reapAllExpiredLocks in class TableLockManager

Throws:

IOException - If there is an unrecoverable error

reapWriteLocks

public void reapWriteLocks()
                    throws IOException

Description copied from class: TableLockManager

Force releases table write locks and lock attempts even if this thread does not own the lock. The behavior of the lock holders still thinking that they have the lock is undefined. This should be used carefully and only when we can ensure that all write-lock holders have died. For example if only the master can hold write locks, then we can reap it's locks when the backup master starts.

Specified by:

reapWriteLocks in class TableLockManager

Throws:

IOException - If there is an unrecoverable error

tableDeleted

public void tableDeleted(TableName tableName)
                  throws IOException

Description copied from class: TableLockManager

Called after a table has been deleted, and after the table lock is released. TableLockManager should do cleanup for the table state.

Specified by:

tableDeleted in class TableLockManager

Parameters:

tableName - name of the table

Throws:

IOException - If there is an unrecoverable error releasing the lock

visitAllLocks

public void visitAllLocks(InterProcessLock.MetadataHandler handler)
                   throws IOException

Description copied from class: TableLockManager

Visits all table locks(read and write), and lock attempts with the given callback MetadataHandler.

Specified by:

visitAllLocks in class TableLockManager

Parameters:

handler - the metadata handler to call

Throws:

IOException - If there is an unrecoverable error