org.apache.hadoop.hive.ql.lockmgr

Class DbLockManager

java.lang.Object

org.apache.hadoop.hive.ql.lockmgr.DbLockManager

All Implemented Interfaces:

HiveLockManager

public final class DbLockManager
extends Object
implements HiveLockManager

An implementation of HiveLockManager for use with DbTxnManager. Note, this lock manager is not meant to be stand alone. It cannot be used without the DbTxnManager. See DbTxnManager.getMS() for important concurrency/metastore access notes.

Method Summary

Modifier and Type	Method and Description
void	close()
org.apache.hadoop.hive.metastore.api.ShowLocksResponse	getLocks()
List<HiveLock>	getLocks(boolean verifyTablePartitions, boolean fetchData)
List<HiveLock>	getLocks(HiveLockObject key, boolean verifyTablePartitions, boolean fetchData)
org.apache.hadoop.hive.metastore.api.ShowLocksResponse	getLocks(org.apache.hadoop.hive.metastore.api.ShowLocksRequest showLocksRequest)
HiveLock	lock(HiveLockObject key, HiveLockMode mode, boolean keepAlive)
List<HiveLock>	lock(List<HiveLockObj> objs, boolean keepAlive, Driver.LockedDriverState lDrvState)
void	prepareRetry()
void	refresh() refresh to enable new configurations.
void	releaseLocks(List<HiveLock> hiveLocks)
void	setContext(HiveLockManagerCtx ctx)
void	unlock(HiveLock hiveLock)

Methods inherited from class java.lang.Object

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

Method Detail

setContext

public void setContext(HiveLockManagerCtx ctx)
                throws LockException

Specified by:

setContext in interface HiveLockManager

Throws:

LockException

lock

public HiveLock lock(HiveLockObject key,
                     HiveLockMode mode,
                     boolean keepAlive)
              throws LockException

Specified by:

lock in interface HiveLockManager

Parameters:

key - object to be locked

mode - mode of the lock (SHARED/EXCLUSIVE)

keepAlive - if the lock needs to be persisted after the statement

Throws:

LockException

lock

public List<HiveLock> lock(List<HiveLockObj> objs,
                           boolean keepAlive,
                           Driver.LockedDriverState lDrvState)
                    throws LockException

Specified by:

lock in interface HiveLockManager

Throws:

LockException

unlock

public void unlock(HiveLock hiveLock)
            throws LockException

Specified by:

unlock in interface HiveLockManager

Throws:

LockException

releaseLocks

public void releaseLocks(List<HiveLock> hiveLocks)

Specified by:

releaseLocks in interface HiveLockManager

getLocks

public List<HiveLock> getLocks(boolean verifyTablePartitions,
                               boolean fetchData)
                        throws LockException

Specified by:

getLocks in interface HiveLockManager

Throws:

LockException

getLocks

public List<HiveLock> getLocks(HiveLockObject key,
                               boolean verifyTablePartitions,
                               boolean fetchData)
                        throws LockException

Specified by:

getLocks in interface HiveLockManager

Throws:

LockException

getLocks

public org.apache.hadoop.hive.metastore.api.ShowLocksResponse getLocks()
                                                                throws LockException

Throws:

LockException

getLocks

public org.apache.hadoop.hive.metastore.api.ShowLocksResponse getLocks(org.apache.hadoop.hive.metastore.api.ShowLocksRequest showLocksRequest)
                                                                throws LockException

Throws:

LockException

close

public void close()
           throws LockException

Specified by:

close in interface HiveLockManager

Throws:

LockException

prepareRetry

public void prepareRetry()
                  throws LockException

Specified by:

prepareRetry in interface HiveLockManager

Throws:

LockException

refresh

public void refresh()

Description copied from interface: HiveLockManager

refresh to enable new configurations.

Specified by:

refresh in interface HiveLockManager