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Change WAL-logging scheme for multixacts to be more like regular

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transaction IDs, rather than like subtrans; in particular, the information
now survives a database restart.  Per previous discussion, this is
essential for PITR log shipping and for 2PC.
This commit is contained in:
Tom Lane
2005-06-08 15:50:28 +00:00
parent 593badd30b
commit f5b2f60bd1
12 changed files with 560 additions and 274 deletions
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61
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.197 2005/06/06 20:22:57 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.198 2005/06/08 15:50:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3688,12 +3688,13 @@ BootStrapXLOG(void)
checkPoint.nextXid = FirstNormalTransactionId;
checkPoint.nextOid = FirstBootstrapObjectId;
checkPoint.nextMulti = FirstMultiXactId;
checkPoint.nextMultiOffset = 0;
checkPoint.time = time(NULL);
ShmemVariableCache->nextXid = checkPoint.nextXid;
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
MultiXactSetNextMXact(checkPoint.nextMulti);
MultiXactSetNextMXact(checkPoint.nextMulti, checkPoint.nextMultiOffset);
/* Set up the XLOG page header */
page->xlp_magic = XLOG_PAGE_MAGIC;
@ -4344,8 +4345,11 @@ StartupXLOG(void)
checkPoint.undo.xlogid, checkPoint.undo.xrecoff,
wasShutdown ? "TRUE" : "FALSE")));
ereport(LOG,
(errmsg("next transaction ID: %u; next OID: %u; next MultiXactId: %u",
checkPoint.nextXid, checkPoint.nextOid, checkPoint.nextMulti)));
(errmsg("next transaction ID: %u; next OID: %u",
checkPoint.nextXid, checkPoint.nextOid)));
ereport(LOG,
(errmsg("next MultiXactId: %u; next MultiXactOffset: %u",
checkPoint.nextMulti, checkPoint.nextMultiOffset)));
if (!TransactionIdIsNormal(checkPoint.nextXid))
ereport(PANIC,
(errmsg("invalid next transaction ID")));
@ -4353,7 +4357,7 @@ StartupXLOG(void)
ShmemVariableCache->nextXid = checkPoint.nextXid;
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
MultiXactSetNextMXact(checkPoint.nextMulti);
MultiXactSetNextMXact(checkPoint.nextMulti, checkPoint.nextMultiOffset);
/*
* We must replay WAL entries using the same TimeLineID they were
@ -5080,7 +5084,9 @@ CreateCheckPoint(bool shutdown, bool force)
checkPoint.nextOid += ShmemVariableCache->oidCount;
LWLockRelease(OidGenLock);
checkPoint.nextMulti = MultiXactGetCheckptMulti(shutdown);
MultiXactGetCheckptMulti(shutdown,
&checkPoint.nextMulti,
&checkPoint.nextMultiOffset);
/*
* Having constructed the checkpoint record, ensure all shmem disk
@ -5228,25 +5234,6 @@ XLogPutNextOid(Oid nextOid)
*/
}
/*
* Write a NEXT_MULTIXACT log record
*/
void
XLogPutNextMultiXactId(MultiXactId nextMulti)
{
XLogRecData rdata;
rdata.data = (char *) (&nextMulti);
rdata.len = sizeof(MultiXactId);
rdata.buffer = InvalidBuffer;
rdata.next = NULL;
(void) XLogInsert(RM_XLOG_ID, XLOG_NEXTMULTI, &rdata);
/*
* We do not flush here either; this assumes that heap_lock_tuple() will
* always generate a WAL record. See notes therein.
*/
}
/*
* XLOG resource manager's routines
*/
@ -5266,14 +5253,6 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ShmemVariableCache->oidCount = 0;
}
}
else if (info == XLOG_NEXTMULTI)
{
MultiXactId nextMulti;
memcpy(&nextMulti, XLogRecGetData(record), sizeof(MultiXactId));
MultiXactAdvanceNextMXact(nextMulti);
}
else if (info == XLOG_CHECKPOINT_SHUTDOWN)
{
CheckPoint checkPoint;
@ -5283,7 +5262,8 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ShmemVariableCache->nextXid = checkPoint.nextXid;
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
MultiXactSetNextMXact(checkPoint.nextMulti);
MultiXactSetNextMXact(checkPoint.nextMulti,
checkPoint.nextMultiOffset);
/*
* TLI may change in a shutdown checkpoint, but it shouldn't
@ -5315,7 +5295,8 @@ xlog_redo(XLogRecPtr lsn, XLogRecord *record)
ShmemVariableCache->nextOid = checkPoint.nextOid;
ShmemVariableCache->oidCount = 0;
}
MultiXactAdvanceNextMXact(checkPoint.nextMulti);
MultiXactAdvanceNextMXact(checkPoint.nextMulti,
checkPoint.nextMultiOffset);
/* TLI should not change in an on-line checkpoint */
if (checkPoint.ThisTimeLineID != ThisTimeLineID)
ereport(PANIC,
@ -5335,12 +5316,13 @@ xlog_desc(char *buf, uint8 xl_info, char *rec)
CheckPoint *checkpoint = (CheckPoint *) rec;
sprintf(buf + strlen(buf), "checkpoint: redo %X/%X; undo %X/%X; "
"tli %u; xid %u; oid %u; multi %u; %s",
"tli %u; xid %u; oid %u; multi %u; offset %u; %s",
checkpoint->redo.xlogid, checkpoint->redo.xrecoff,
checkpoint->undo.xlogid, checkpoint->undo.xrecoff,
checkpoint->ThisTimeLineID, checkpoint->nextXid,
checkpoint->nextOid,
checkpoint->nextMulti,
checkpoint->nextMultiOffset,
(info == XLOG_CHECKPOINT_SHUTDOWN) ? "shutdown" : "online");
}
else if (info == XLOG_NEXTOID)
@ -5350,13 +5332,6 @@ xlog_desc(char *buf, uint8 xl_info, char *rec)
memcpy(&nextOid, rec, sizeof(Oid));
sprintf(buf + strlen(buf), "nextOid: %u", nextOid);
}
else if (info == XLOG_NEXTMULTI)
{
MultiXactId multi;
memcpy(&multi, rec, sizeof(MultiXactId));
sprintf(buf + strlen(buf), "nextMultiXact: %u", multi);
}
else
strcat(buf, "UNKNOWN");
}