org.apache.hadoop.hive.metastore.txn

Class TxnCommonUtils

java.lang.Object

org.apache.hadoop.hive.metastore.txn.TxnCommonUtils

public class TxnCommonUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
TxnCommonUtils()

Method Summary

Modifier and Type	Method and Description
static ValidReaderWriteIdList	createValidReaderWriteIdList(TableValidWriteIds tableWriteIds) Transform a TableValidWriteIds to a ValidReaderWriteIdList.
static ValidTxnList	createValidReadTxnList(GetOpenTxnsResponse txns, long currentTxn) Transform a GetOpenTxnsResponse to a ValidTxnList.
static ValidTxnWriteIdList	createValidTxnWriteIdList(Long currentTxnId, List<TableValidWriteIds> validIds) Transform a GetValidWriteIdsResponse to a ValidTxnWriteIdList.

Methods inherited from class java.lang.Object

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

Constructor Detail

TxnCommonUtils

public TxnCommonUtils()

Method Detail

createValidReadTxnList

public static ValidTxnList createValidReadTxnList(GetOpenTxnsResponse txns,
                                                  long currentTxn)

Transform a GetOpenTxnsResponse to a ValidTxnList. This assumes that the caller intends to read the files, and thus treats both open and aborted transactions as invalid.

Parameters:

txns - txn list from the metastore

currentTxn - Current transaction that the user has open. If this is greater than 0 it will be removed from the exceptions list so that the user sees his own transaction as valid.

Returns:

a valid txn list.

createValidTxnWriteIdList

public static ValidTxnWriteIdList createValidTxnWriteIdList(Long currentTxnId,
                                                            List<TableValidWriteIds> validIds)

Transform a GetValidWriteIdsResponse to a ValidTxnWriteIdList. This assumes that the caller intends to read the files, and thus treats both open and aborted transactions as invalid.

Parameters:

currentTxnId - current txn ID for which we get the valid write ids list

validIds - valid write ids list from the metastore

Returns:

a valid write IDs list for the whole transaction.

createValidReaderWriteIdList

public static ValidReaderWriteIdList createValidReaderWriteIdList(TableValidWriteIds tableWriteIds)

Transform a TableValidWriteIds to a ValidReaderWriteIdList. This assumes that the caller intends to read the files, and thus treats both open and aborted write ids as invalid.

Parameters:

tableWriteIds - valid write ids for the given table from the metastore

Returns:

a valid write IDs list for the input table