org.apache.hadoop.hive.ql.lockmgr
Class TxnManagerFactory

java.lang.Object
  org.apache.hadoop.hive.ql.lockmgr.TxnManagerFactory

public class TxnManagerFactory
extends Object

A factory to get an instance of HiveTxnManager. This should always be called rather than building a transaction manager via reflection. This factory will read the configuration file to determine which transaction manager to instantiate. It will stash the chosen transaction manager into the Context object, and subsequently return it from there so that if there are multiple Hive threads running, each will get it's appropriate transaction manager.

Method Summary

HiveTxnManager	getTxnManager(HiveConf conf) Create a new transaction manager.
static TxnManagerFactory	getTxnManagerFactory() Get the singleton instance of this factory.

Methods inherited from class java.lang.Object

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

Method Detail

getTxnManagerFactory

public static TxnManagerFactory getTxnManagerFactory()

Get the singleton instance of this factory.

Returns:

this factory

getTxnManager

public HiveTxnManager getTxnManager(HiveConf conf)
                             throws LockException

Create a new transaction manager. The transaction manager to instantiate will be determined by the hive.txn.manager value in the configuration. This should not be called if a transaction manager has already been constructed and stored in the Context object.

Parameters:

conf - HiveConf object used to construct the transaction manager

Returns:

the transaction manager

Throws:

LockException - if there is an error constructing the transaction manager.