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Two-phase commit. Original patch by Heikki Linnakangas, with additional

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hacking by Alvaro Herrera and Tom Lane.
This commit is contained in:
Tom Lane
2005-06-17 22:32:51 +00:00
parent 5495575903
commit d0a89683a3
61 changed files with 4454 additions and 439 deletions
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71
src/backend/utils/init/flatfiles.c
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@ -22,7 +22,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.7 2005/06/06 17:01:24 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.8 2005/06/17 22:32:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -32,6 +32,7 @@
#include <unistd.h>
#include "access/heapam.h"
#include "access/twophase_rmgr.h"
#include "catalog/pg_database.h"
#include "catalog/pg_group.h"
#include "catalog/pg_namespace.h"
@ -48,10 +49,16 @@
#include "utils/syscache.h"
/* Actual names of the flat files (within $PGDATA/global/) */
#define DATABASE_FLAT_FILE "pg_database"
#define GROUP_FLAT_FILE "pg_group"
#define USER_FLAT_FILE "pg_pwd"
/* Info bits in a flatfiles 2PC record */
#define FF_BIT_DATABASE 1
#define FF_BIT_GROUP 2
#define FF_BIT_USER 4
/*
* The need-to-update-files flags are SubTransactionIds that show
@ -757,6 +764,43 @@ AtEOXact_UpdateFlatFiles(bool isCommit)
SendPostmasterSignal(PMSIGNAL_PASSWORD_CHANGE);
}
/*
* This routine is called during transaction prepare.
*
* Record which files need to be refreshed if this transaction later
* commits.
*
* Note: it's OK to clear the flags immediately, since if the PREPARE fails
* further on, we'd only reset the flags anyway. So there's no need for a
* separate PostPrepare call.
*/
void
AtPrepare_UpdateFlatFiles(void)
{
uint16 info = 0;
if (database_file_update_subid != InvalidSubTransactionId)
{
database_file_update_subid = InvalidSubTransactionId;
info |= FF_BIT_DATABASE;
}
if (group_file_update_subid != InvalidSubTransactionId)
{
group_file_update_subid = InvalidSubTransactionId;
info |= FF_BIT_GROUP;
}
if (user_file_update_subid != InvalidSubTransactionId)
{
user_file_update_subid = InvalidSubTransactionId;
info |= FF_BIT_USER;
}
if (info != 0)
RegisterTwoPhaseRecord(TWOPHASE_RM_FLATFILES_ID, info,
NULL, 0);
}
/*
* AtEOSubXact_UpdateFlatFiles
*
@ -831,3 +875,28 @@ flatfile_update_trigger(PG_FUNCTION_ARGS)
return PointerGetDatum(NULL);
}
/*
* 2PC processing routine for COMMIT PREPARED case.
*
* (We don't have to do anything for ROLLBACK PREPARED.)
*/
void
flatfile_twophase_postcommit(TransactionId xid, uint16 info,
void *recdata, uint32 len)
{
/*
* Set flags to do the needed file updates at the end of my own
* current transaction. (XXX this has some issues if my own
* transaction later rolls back, or if there is any significant
* delay before I commit. OK for now because we disallow
* COMMIT PREPARED inside a transaction block.)
*/
if (info & FF_BIT_DATABASE)
database_file_update_needed();
if (info & FF_BIT_GROUP)
group_file_update_needed();
if (info & FF_BIT_USER)
user_file_update_needed();
}