org.apache.hadoop.hive.common

Class ValidReadTxnList

java.lang.Object

org.apache.hadoop.hive.common.ValidReadTxnList

All Implemented Interfaces:

ValidTxnList

public class ValidReadTxnList
extends Object
implements ValidTxnList

An implmentation of ValidTxnList for use by readers. This class will view a transaction as valid only if it is committed. Both open and aborted transactions will be seen as invalid.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hive.common.ValidTxnList

ValidTxnList.RangeResponse

Field Summary

Fields

Modifier and Type	Field and Description
protected long[]	exceptions
protected long	highWatermark

Fields inherited from interface org.apache.hadoop.hive.common.ValidTxnList

VALID_TXNS_KEY

Constructor Summary

Constructors

Constructor and Description
ValidReadTxnList()
ValidReadTxnList(long[] exceptions, long highWatermark)
ValidReadTxnList(String value)

Method Summary

Methods

Modifier and Type	Method and Description
long	getHighWatermark() Get the largest committed transaction id.
long[]	getInvalidTransactions() Get the list of transactions under the high water mark that are not valid.
ValidTxnList.RangeResponse	isTxnRangeValid(long minTxnId, long maxTxnId) Find out if a range of transaction ids are valid.
boolean	isTxnValid(long txnid) Indicates whether a given transaction is valid.
void	readFromString(String src) Populate this validTxnList from the string.
String	toString()
String	writeToString() Write this validTxnList into a string.

Methods inherited from class java.lang.Object

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

Field Detail

exceptions

protected long[] exceptions

highWatermark

protected long highWatermark

Constructor Detail

ValidReadTxnList

public ValidReadTxnList()

ValidReadTxnList

public ValidReadTxnList(long[] exceptions,
                long highWatermark)

ValidReadTxnList

public ValidReadTxnList(String value)

Method Detail

isTxnValid

public boolean isTxnValid(long txnid)

Description copied from interface: ValidTxnList

Indicates whether a given transaction is valid. Note that valid may have different meanings for different implementations, as some will only want to see committed transactions and some both committed and aborted.

Specified by:

isTxnValid in interface ValidTxnList

Parameters:

txnid - id for the transaction

Returns:

true if valid, false otherwise

isTxnRangeValid

public ValidTxnList.RangeResponse isTxnRangeValid(long minTxnId,
                                         long maxTxnId)

Description copied from interface: ValidTxnList

Find out if a range of transaction ids are valid. Note that valid may have different meanings for different implementations, as some will only want to see committed transactions and some both committed and aborted.

Specified by:

isTxnRangeValid in interface ValidTxnList

Parameters:

minTxnId - minimum txnid to look for, inclusive

maxTxnId - maximum txnid to look for, inclusive

Returns:

Indicate whether none, some, or all of these transactions are valid.

toString

public String toString()

Overrides:

toString in class Object

writeToString

public String writeToString()

Description copied from interface: ValidTxnList

Write this validTxnList into a string. This should produce a string that can be used by ValidTxnList.readFromString(String) to populate a validTxnsList.

Specified by:

writeToString in interface ValidTxnList

readFromString

public void readFromString(String src)

Description copied from interface: ValidTxnList

Populate this validTxnList from the string. It is assumed that the string was created via ValidTxnList.writeToString().

Specified by:

readFromString in interface ValidTxnList

Parameters:

src - source string.

getHighWatermark

public long getHighWatermark()

Description copied from interface: ValidTxnList

Get the largest committed transaction id.

Specified by:

getHighWatermark in interface ValidTxnList

Returns:

largest committed transaction id

getInvalidTransactions

public long[] getInvalidTransactions()

Description copied from interface: ValidTxnList

Get the list of transactions under the high water mark that are not valid. Note that invalid may have different meanings for different implementations, as some will only want to see open transactions and some both open and aborted.

Specified by:

getInvalidTransactions in interface ValidTxnList

Returns:

a list of invalid transaction ids