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Arrange to fsync two-phase-commit state files only during checkpoints;

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given reasonably short lifespans for prepared transactions, this should
mean that only a small minority of state files ever need to be fsynced
at all.  Per discussion with Heikki Linnakangas.
This commit is contained in:
Tom Lane
2005-06-19 20:00:39 +00:00
parent ba90268e2b
commit e26b0abda3
4 changed files with 197 additions and 58 deletions
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7
src/include/access/twophase.h
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@@ -7,14 +7,14 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/twophase.h,v 1.2 2005/06/18 19:33:42 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/twophase.h,v 1.3 2005/06/19 20:00:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TWOPHASE_H
#define TWOPHASE_H
#include "storage/lock.h"
#include "storage/proc.h"
#include "utils/timestamp.h"
@@ -35,7 +35,6 @@ extern PGPROC *TwoPhaseGetDummyProc(TransactionId xid);
extern GlobalTransaction MarkAsPreparing(TransactionId xid, const char *gid,
TimestampTz prepared_at,
AclId owner, Oid databaseid);
extern void MarkAsPrepared(GlobalTransaction gxact);
extern void StartPrepare(GlobalTransaction gxact);
extern void EndPrepare(GlobalTransaction gxact);
@@ -46,6 +45,8 @@ extern void RecoverPreparedTransactions(void);
extern void RecreateTwoPhaseFile(TransactionId xid, void *content, int len);
extern void RemoveTwoPhaseFile(TransactionId xid, bool giveWarning);
extern void CheckPointTwoPhase(XLogRecPtr redo_horizon);
extern void FinishPreparedTransaction(const char *gid, bool isCommit);
#endif /* TWOPHASE_H */