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Commit78f7ccc

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1. Fix for elog(ERROR, "EvalPlanQual: t_xmin is uncommitted ?!")
 and possibly for other cases too: DO NOT cache status of transaction in unknown state (i.e. non-committed and non-aborted ones) Example: T1 reads row updated/inserted by running T2 and cache T2 status. T2 commits. Now T1 reads a row updated by T2 and with HEAP_XMAX_COMMITTED in t_infomask (so cached T2 status is not changed). Now T1 EvalPlanQual gets updated row version without HEAP_XMIN_COMMITTED -> TransactionIdDidCommit(t_xmin) and TransactionIdDidAbort(t_xmin) return FALSE and T2 decides that t_xmin is not committed and gets ERROR above. It's too late to find more smart way to handle such cases and so I just changed xact status caching and got rid TransactionIdFlushCache() from code. Changed: transam.c, xact.c, lmgr.c and transam.h - last three just because of TransactionIdFlushCache() is removed.2. heapam.c: T1 marked a row for update. T2 waits for T1 commit/abort. T1 commits. T3 updates the row before T2 locks row page. Now T2 sees that new row t_xmax is different from xact id (T1) T2 was waiting for. Old code did Assert here. New one goes to HeapTupleSatisfiesUpdate. Obvious changes too.3. Added Assert to vacuum.c4. bufmgr.c: break Assert(buf->r_locks == 0 && !buf->ri_lock) into two Asserts.
1 parentc37ecaf commit78f7ccc

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7 files changed

+40
-31
lines changed

7 files changed

+40
-31
lines changed

‎src/backend/access/heap/heapam.c‎

Lines changed: 22 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.43 1999/05/25 16:07:04 momjian Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.44 1999/06/10 14:17:05 vadim Exp $
1111
*
1212
*
1313
* INTERFACE ROUTINES
@@ -1152,8 +1152,13 @@ heap_delete(Relation relation, ItemPointer tid, ItemPointer ctid)
11521152
LockBuffer(buffer,BUFFER_LOCK_EXCLUSIVE);
11531153
if (TransactionIdDidAbort(xwait))
11541154
gotol1;
1155-
/* concurrent xact committed */
1156-
Assert(tp.t_data->t_xmax==xwait);
1155+
/*
1156+
* xwait is committed but if xwait had just marked
1157+
* the tuple for update then some other xaction could
1158+
* update this tuple before we got to this point.
1159+
*/
1160+
if (tp.t_data->t_xmax!=xwait)
1161+
gotol1;
11571162
if (!(tp.t_data->t_infomask&HEAP_XMAX_COMMITTED))
11581163
{
11591164
tp.t_data->t_infomask |=HEAP_XMAX_COMMITTED;
@@ -1242,8 +1247,13 @@ heap_replace(Relation relation, ItemPointer otid, HeapTuple newtup,
12421247
LockBuffer(buffer,BUFFER_LOCK_EXCLUSIVE);
12431248
if (TransactionIdDidAbort(xwait))
12441249
gotol2;
1245-
/* concurrent xact committed */
1246-
Assert(oldtup.t_data->t_xmax==xwait);
1250+
/*
1251+
* xwait is committed but if xwait had just marked
1252+
* the tuple for update then some other xaction could
1253+
* update this tuple before we got to this point.
1254+
*/
1255+
if (oldtup.t_data->t_xmax!=xwait)
1256+
gotol2;
12471257
if (!(oldtup.t_data->t_infomask&HEAP_XMAX_COMMITTED))
12481258
{
12491259
oldtup.t_data->t_infomask |=HEAP_XMAX_COMMITTED;
@@ -1359,8 +1369,13 @@ heap_mark4update(Relation relation, HeapTuple tuple, Buffer *buffer)
13591369
LockBuffer(*buffer,BUFFER_LOCK_EXCLUSIVE);
13601370
if (TransactionIdDidAbort(xwait))
13611371
gotol3;
1362-
/* concurrent xact committed */
1363-
Assert(tuple->t_data->t_xmax==xwait);
1372+
/*
1373+
* xwait is committed but if xwait had just marked
1374+
* the tuple for update then some other xaction could
1375+
* update this tuple before we got to this point.
1376+
*/
1377+
if (tuple->t_data->t_xmax!=xwait)
1378+
gotol3;
13641379
if (!(tuple->t_data->t_infomask&HEAP_XMAX_COMMITTED))
13651380
{
13661381
tuple->t_data->t_infomask |=HEAP_XMAX_COMMITTED;

‎src/backend/access/transam/transam.c‎

Lines changed: 9 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.26 1999/05/25 16:07:45 momjian Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/access/transam/transam.c,v 1.27 1999/06/10 14:17:06 vadim Exp $
1111
*
1212
* NOTES
1313
* This file contains the high level access-method interface to the
@@ -172,8 +172,14 @@ TransactionLogTest(TransactionId transactionId, /* transaction id to test */
172172

173173
if (!fail)
174174
{
175-
TransactionIdStore(transactionId,&cachedTestXid);
176-
cachedTestXidStatus=xidstatus;
175+
/*
176+
* DO NOT cache status for transactions in unknown state !!!
177+
*/
178+
if (xidstatus==XID_COMMIT||xidstatus==XID_ABORT)
179+
{
180+
TransactionIdStore(transactionId,&cachedTestXid);
181+
cachedTestXidStatus=xidstatus;
182+
}
177183
return (bool) (status==xidstatus);
178184
}
179185

@@ -576,12 +582,3 @@ TransactionIdAbort(TransactionId transactionId)
576582

577583
TransactionLogUpdate(transactionId,XID_ABORT);
578584
}
579-
580-
void
581-
TransactionIdFlushCache()
582-
{
583-
584-
TransactionIdStore(AmiTransactionId,&cachedTestXid);
585-
cachedTestXidStatus=XID_COMMIT;
586-
587-
}

‎src/backend/access/transam/xact.c‎

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.40 1999/06/06 20:19:34 vadim Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/access/transam/xact.c,v 1.41 1999/06/10 14:17:06 vadim Exp $
1111
*
1212
* NOTES
1313
*Transaction aborts can now occur two ways:
@@ -514,8 +514,6 @@ CommandCounterIncrement()
514514
AtCommit_Cache();
515515
AtStart_Cache();
516516

517-
TransactionIdFlushCache();
518-
519517
}
520518

521519
void
@@ -822,7 +820,6 @@ StartTransaction()
822820
{
823821
TransactionStates=CurrentTransactionState;
824822

825-
TransactionIdFlushCache();
826823
FreeXactSnapshot();
827824
XactIsoLevel=DefaultXactIsoLevel;
828825

‎src/backend/commands/vacuum.c‎

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.107 1999/06/06 20:19:34 vadim Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.108 1999/06/10 14:17:07 vadim Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -1351,6 +1351,8 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
13511351
if (!ItemIdIsUsed(Pitemid))
13521352
elog(ERROR,"Parent itemid marked as unused");
13531353
Ptp.t_data= (HeapTupleHeader)PageGetItem(Ppage,Pitemid);
1354+
Assert(ItemPointerEquals(&(vtld.new_tid),
1355+
&(Ptp.t_data->t_ctid)));
13541356
Assert(Ptp.t_data->t_xmax==tp.t_data->t_xmin);
13551357

13561358
#ifdefNOT_USED/* I'm not sure that this will wotk properly... */

‎src/backend/storage/buffer/bufmgr.c‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.53 1999/05/29 03:58:43 tgl Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.54 1999/06/10 14:17:09 vadim Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -2007,7 +2007,8 @@ LockBuffer(Buffer buffer, int mode)
20072007
elseif (BufferLocks[buffer-1]&BL_W_LOCK)
20082008
{
20092009
Assert(buf->w_lock);
2010-
Assert(buf->r_locks==0&& !buf->ri_lock);
2010+
Assert(buf->r_locks==0);
2011+
Assert(!buf->ri_lock);
20112012
Assert(!(BufferLocks[buffer-1]& (BL_R_LOCK |BL_RI_LOCK)))
20122013
buf->w_lock= false;
20132014
BufferLocks[buffer-1] &= ~BL_W_LOCK;

‎src/backend/storage/lmgr/lmgr.c‎

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.26 1999/05/31 01:48:13 vadim Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.27 1999/06/10 14:17:11 vadim Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -324,8 +324,6 @@ XactLockTableWait(TransactionId xid)
324324
LockAcquire(LockTableId,&tag,ShareLock);
325325
LockRelease(LockTableId,&tag,ShareLock);
326326

327-
TransactionIdFlushCache();
328-
329327
/*
330328
* Transaction was committed/aborted/crashed - we have to update
331329
* pg_log if transaction is still marked as running.

‎src/include/access/transam.h‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
*
77
* Copyright (c) 1994, Regents of the University of California
88
*
9-
* $Id: transam.h,v 1.21 1999/05/25 22:42:35 momjian Exp $
9+
* $Id: transam.h,v 1.22 1999/06/10 14:17:12 vadim Exp $
1010
*
1111
* NOTES
1212
*Transaction System Version 101 now support proper oid
@@ -145,7 +145,6 @@ extern bool TransactionIdDidCommit(TransactionId transactionId);
145145
externboolTransactionIdDidAbort(TransactionIdtransactionId);
146146
externvoidTransactionIdCommit(TransactionIdtransactionId);
147147
externvoidTransactionIdAbort(TransactionIdtransactionId);
148-
externvoidTransactionIdFlushCache(void);
149148

150149
/* in transam/transsup.c */
151150
externvoidAmiTransactionOverride(boolflag);

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