Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commitcbe9d6b

Browse files
committed
Fix up rickety handling of relation-truncation interlocks.
Move rd_targblock, rd_fsm_nblocks, and rd_vm_nblocks from relcache to the smgrrelation entries, so that they will get reset to InvalidBlockNumber wheneveran smgr-level flush happens. Because we now send smgr invalidation messagesimmediately (not at end of transaction) when a relation truncation occurs,this ensures that other backends will reset their values before they nextaccess the relation. We no longer need the unreliable assumption that aVACUUM that's doing a truncation will hold its AccessExclusive lock untilcommit --- in fact, we can intentionally release that lock as soon as we'vecompleted the truncation. This patch therefore reverts (most of) Alvaro'spatch of 2009-11-10, as well as my marginal hacking on it yesterday. We canalso get rid of assorted no-longer-needed relcache flushes, which are far moreexpensive than an smgr flush because they kill a lot more state.In passing this patch fixes smgr_redo's failure to perform visibility-maptruncation, and cleans up some rather dubious assumptions in freespace.c andvisibilitymap.c about when rd_fsm_nblocks and rd_vm_nblocks can be out ofdate.
1 parent79647ee commitcbe9d6b

File tree

15 files changed

+207
-216
lines changed

15 files changed

+207
-216
lines changed

‎src/backend/access/heap/hio.c‎

Lines changed: 6 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/heap/hio.c,v 1.77 2010/01/02 16:57:34 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/heap/hio.c,v 1.78 2010/02/09 21:43:29 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -20,6 +20,7 @@
2020
#include"storage/bufmgr.h"
2121
#include"storage/freespace.h"
2222
#include"storage/lmgr.h"
23+
#include"storage/smgr.h"
2324

2425

2526
/*
@@ -126,7 +127,7 @@ ReadBufferBI(Relation relation, BlockNumber targetBlock,
126127
*
127128
*HEAP_INSERT_SKIP_FSM is also useful for non-WAL-logged additions to a
128129
*relation, if the caller holds exclusive lock and is careful to invalidate
129-
*relation->rd_targblock before the first insertion --- that ensures that
130+
*relation's smgr_targblock before the first insertion --- that ensures that
130131
*all insertions will occur into newly added pages and not be intermixed
131132
*with tuples from other transactions. That way, a crash can't risk losing
132133
*any committed data of other transactions. (See heap_insert's comments
@@ -206,7 +207,7 @@ RelationGetBufferForTuple(Relation relation, Size len,
206207
elseif (bistate&&bistate->current_buf!=InvalidBuffer)
207208
targetBlock=BufferGetBlockNumber(bistate->current_buf);
208209
else
209-
targetBlock=relation->rd_targblock;
210+
targetBlock=RelationGetTargetBlock(relation);
210211

211212
if (targetBlock==InvalidBlockNumber&&use_fsm)
212213
{
@@ -273,7 +274,7 @@ RelationGetBufferForTuple(Relation relation, Size len,
273274
if (len+saveFreeSpace <=pageFreeSpace)
274275
{
275276
/* use this page as future insert target, too */
276-
relation->rd_targblock=targetBlock;
277+
RelationSetTargetBlock(relation,targetBlock);
277278
returnbuffer;
278279
}
279280

@@ -377,7 +378,7 @@ RelationGetBufferForTuple(Relation relation, Size len,
377378
* current backend to make more insertions or not, which is probably a
378379
* good bet most of the time. So for now, don't add it to FSM yet.
379380
*/
380-
relation->rd_targblock=BufferGetBlockNumber(buffer);
381+
RelationSetTargetBlock(relation,BufferGetBlockNumber(buffer));
381382

382383
returnbuffer;
383384
}

‎src/backend/access/heap/visibilitymap.c‎

Lines changed: 46 additions & 32 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/heap/visibilitymap.c,v 1.7 2010/01/02 16:57:35 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/heap/visibilitymap.c,v 1.8 2010/02/09 21:43:29 tgl Exp $
1212
*
1313
* INTERFACE ROUTINES
1414
*visibilitymap_clear - clear a bit in the visibility map
@@ -94,7 +94,7 @@
9494
#include"storage/bufpage.h"
9595
#include"storage/lmgr.h"
9696
#include"storage/smgr.h"
97-
#include"utils/inval.h"
97+
9898

9999
/*#define TRACE_VISIBILITYMAP */
100100

@@ -291,7 +291,13 @@ visibilitymap_test(Relation rel, BlockNumber heapBlk, Buffer *buf)
291291
}
292292

293293
/*
294-
*visibilitymap_test - truncate the visibility map
294+
*visibilitymap_truncate - truncate the visibility map
295+
*
296+
* The caller must hold AccessExclusiveLock on the relation, to ensure that
297+
* other backends receive the smgr invalidation event that this function sends
298+
* before they access the VM again.
299+
*
300+
* nheapblocks is the new size of the heap.
295301
*/
296302
void
297303
visibilitymap_truncate(Relationrel,BlockNumbernheapblocks)
@@ -307,6 +313,8 @@ visibilitymap_truncate(Relation rel, BlockNumber nheapblocks)
307313
elog(DEBUG1,"vm_truncate %s %d",RelationGetRelationName(rel),nheapblocks);
308314
#endif
309315

316+
RelationOpenSmgr(rel);
317+
310318
/*
311319
* If no visibility map has been created yet for this relation, there's
312320
* nothing to truncate.
@@ -358,23 +366,25 @@ visibilitymap_truncate(Relation rel, BlockNumber nheapblocks)
358366
else
359367
newnblocks=truncBlock;
360368

361-
if (smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM)<newnblocks)
369+
if (smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM) <=newnblocks)
362370
{
363371
/* nothing to do, the file was already smaller than requested size */
364372
return;
365373
}
366374

375+
/* Truncate the unused VM pages, and send smgr inval message */
367376
smgrtruncate(rel->rd_smgr,VISIBILITYMAP_FORKNUM,newnblocks,
368377
rel->rd_istemp);
369378

370379
/*
371-
* Need to invalidate the relcache entry, because rd_vm_nblocks seen by
372-
* other backends is no longer valid.
380+
* We might as well update the local smgr_vm_nblocks setting.
381+
* smgrtruncate sent an smgr cache inval message, which will cause
382+
* other backends to invalidate their copy of smgr_vm_nblocks, and
383+
* this one too at the next command boundary. But this ensures it
384+
* isn't outright wrong until then.
373385
*/
374-
if (!InRecovery)
375-
CacheInvalidateRelcache(rel);
376-
377-
rel->rd_vm_nblocks=newnblocks;
386+
if (rel->rd_smgr)
387+
rel->rd_smgr->smgr_vm_nblocks=newnblocks;
378388
}
379389

380390
/*
@@ -391,21 +401,23 @@ vm_readbuf(Relation rel, BlockNumber blkno, bool extend)
391401
RelationOpenSmgr(rel);
392402

393403
/*
394-
* The current size of the visibility map fork is kept in relcache, to
395-
* avoid reading beyond EOF. If we haven't cached the size of the map yet,
396-
* do that first.
404+
* If we haven't cached the size of the visibility map fork yet, check it
405+
* first. Also recheck if the requested block seems to be past end, since
406+
* our cached value might be stale. (We send smgr inval messages on
407+
* truncation, but not on extension.)
397408
*/
398-
if (rel->rd_vm_nblocks==InvalidBlockNumber)
409+
if (rel->rd_smgr->smgr_vm_nblocks==InvalidBlockNumber||
410+
blkno >=rel->rd_smgr->smgr_vm_nblocks)
399411
{
400412
if (smgrexists(rel->rd_smgr,VISIBILITYMAP_FORKNUM))
401-
rel->rd_vm_nblocks=smgrnblocks(rel->rd_smgr,
402-
VISIBILITYMAP_FORKNUM);
413+
rel->rd_smgr->smgr_vm_nblocks=smgrnblocks(rel->rd_smgr,
414+
VISIBILITYMAP_FORKNUM);
403415
else
404-
rel->rd_vm_nblocks=0;
416+
rel->rd_smgr->smgr_vm_nblocks=0;
405417
}
406418

407419
/* Handle requests beyond EOF */
408-
if (blkno >=rel->rd_vm_nblocks)
420+
if (blkno >=rel->rd_smgr->smgr_vm_nblocks)
409421
{
410422
if (extend)
411423
vm_extend(rel,blkno+1);
@@ -446,19 +458,23 @@ vm_extend(Relation rel, BlockNumber vm_nblocks)
446458
* separate lock tag type for it.
447459
*
448460
* Note that another backend might have extended or created the relation
449-
*before we get the lock.
461+
*by the time we get the lock.
450462
*/
451463
LockRelationForExtension(rel,ExclusiveLock);
452464

453-
/* Create the file first if it doesn't exist */
454-
if ((rel->rd_vm_nblocks==0||rel->rd_vm_nblocks==InvalidBlockNumber)
455-
&& !smgrexists(rel->rd_smgr,VISIBILITYMAP_FORKNUM))
456-
{
465+
/* Might have to re-open if a cache flush happened */
466+
RelationOpenSmgr(rel);
467+
468+
/*
469+
* Create the file first if it doesn't exist. If smgr_vm_nblocks
470+
* is positive then it must exist, no need for an smgrexists call.
471+
*/
472+
if ((rel->rd_smgr->smgr_vm_nblocks==0||
473+
rel->rd_smgr->smgr_vm_nblocks==InvalidBlockNumber)&&
474+
!smgrexists(rel->rd_smgr,VISIBILITYMAP_FORKNUM))
457475
smgrcreate(rel->rd_smgr,VISIBILITYMAP_FORKNUM, false);
458-
vm_nblocks_now=0;
459-
}
460-
else
461-
vm_nblocks_now=smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM);
476+
477+
vm_nblocks_now=smgrnblocks(rel->rd_smgr,VISIBILITYMAP_FORKNUM);
462478

463479
while (vm_nblocks_now<vm_nblocks)
464480
{
@@ -467,12 +483,10 @@ vm_extend(Relation rel, BlockNumber vm_nblocks)
467483
vm_nblocks_now++;
468484
}
469485

486+
/* Update local cache with the up-to-date size */
487+
rel->rd_smgr->smgr_vm_nblocks=vm_nblocks_now;
488+
470489
UnlockRelationForExtension(rel,ExclusiveLock);
471490

472491
pfree(pg);
473-
474-
/* Update the relcache with the up-to-date size */
475-
if (!InRecovery)
476-
CacheInvalidateRelcache(rel);
477-
rel->rd_vm_nblocks=vm_nblocks_now;
478492
}

‎src/backend/access/transam/xlogutils.c‎

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
1212
* Portions Copyright (c) 1994, Regents of the University of California
1313
*
14-
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.69 2010/01/02 16:57:35 momjian Exp $
14+
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.70 2010/02/09 21:43:29 tgl Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
@@ -393,9 +393,6 @@ CreateFakeRelcacheEntry(RelFileNode rnode)
393393
rel->rd_lockInfo.lockRelId.dbId=rnode.dbNode;
394394
rel->rd_lockInfo.lockRelId.relId=rnode.relNode;
395395

396-
rel->rd_targblock=InvalidBlockNumber;
397-
rel->rd_fsm_nblocks=InvalidBlockNumber;
398-
rel->rd_vm_nblocks=InvalidBlockNumber;
399396
rel->rd_smgr=NULL;
400397

401398
returnrel;

‎src/backend/catalog/storage.c‎

Lines changed: 15 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/catalog/storage.c,v 1.9 2010/02/08 19:59:49 heikki Exp $
11+
* $PostgreSQL: pgsql/src/backend/catalog/storage.c,v 1.10 2010/02/09 21:43:30 tgl Exp $
1212
*
1313
* NOTES
1414
* Some of this code used to be in storage/smgr/smgr.c, and the
@@ -226,8 +226,12 @@ RelationTruncate(Relation rel, BlockNumber nblocks)
226226
/* Open it at the smgr level if not already done */
227227
RelationOpenSmgr(rel);
228228

229-
/* Make sure rd_targblock isn't pointing somewhere past end */
230-
rel->rd_targblock=InvalidBlockNumber;
229+
/*
230+
* Make sure smgr_targblock etc aren't pointing somewhere past new end
231+
*/
232+
rel->rd_smgr->smgr_targblock=InvalidBlockNumber;
233+
rel->rd_smgr->smgr_fsm_nblocks=InvalidBlockNumber;
234+
rel->rd_smgr->smgr_vm_nblocks=InvalidBlockNumber;
231235

232236
/* Truncate the FSM first if it exists */
233237
fsm=smgrexists(rel->rd_smgr,FSM_FORKNUM);
@@ -459,6 +463,7 @@ smgr_redo(XLogRecPtr lsn, XLogRecord *record)
459463
{
460464
xl_smgr_truncate*xlrec= (xl_smgr_truncate*)XLogRecGetData(record);
461465
SMgrRelationreln;
466+
Relationrel;
462467

463468
reln=smgropen(xlrec->rnode);
464469

@@ -475,14 +480,15 @@ smgr_redo(XLogRecPtr lsn, XLogRecord *record)
475480
/* Also tell xlogutils.c about it */
476481
XLogTruncateRelation(xlrec->rnode,MAIN_FORKNUM,xlrec->blkno);
477482

478-
/* Truncate FSM too */
479-
if (smgrexists(reln,FSM_FORKNUM))
480-
{
481-
Relationrel=CreateFakeRelcacheEntry(xlrec->rnode);
483+
/* Truncate FSM and VM too */
484+
rel=CreateFakeRelcacheEntry(xlrec->rnode);
482485

486+
if (smgrexists(reln,FSM_FORKNUM))
483487
FreeSpaceMapTruncateRel(rel,xlrec->blkno);
484-
FreeFakeRelcacheEntry(rel);
485-
}
488+
if (smgrexists(reln,VISIBILITYMAP_FORKNUM))
489+
visibilitymap_truncate(rel,xlrec->blkno);
490+
491+
FreeFakeRelcacheEntry(rel);
486492
}
487493
else
488494
elog(PANIC,"smgr_redo: unknown op code %u",info);

‎src/backend/commands/cluster.c‎

Lines changed: 4 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.199 2010/02/07 22:40:33 tgl Exp $
14+
* $PostgreSQL: pgsql/src/backend/commands/cluster.c,v 1.200 2010/02/09 21:43:30 tgl Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
@@ -38,6 +38,7 @@
3838
#include"miscadmin.h"
3939
#include"storage/bufmgr.h"
4040
#include"storage/procarray.h"
41+
#include"storage/smgr.h"
4142
#include"utils/acl.h"
4243
#include"utils/fmgroids.h"
4344
#include"utils/inval.h"
@@ -559,16 +560,12 @@ mark_index_clustered(Relation rel, Oid indexOid)
559560
indexForm->indisclustered= false;
560561
simple_heap_update(pg_index,&indexTuple->t_self,indexTuple);
561562
CatalogUpdateIndexes(pg_index,indexTuple);
562-
/* Ensure we see the update in the index's relcache entry */
563-
CacheInvalidateRelcacheByRelid(thisIndexOid);
564563
}
565564
elseif (thisIndexOid==indexOid)
566565
{
567566
indexForm->indisclustered= true;
568567
simple_heap_update(pg_index,&indexTuple->t_self,indexTuple);
569568
CatalogUpdateIndexes(pg_index,indexTuple);
570-
/* Ensure we see the update in the index's relcache entry */
571-
CacheInvalidateRelcacheByRelid(thisIndexOid);
572569
}
573570
heap_freetuple(indexTuple);
574571
}
@@ -819,8 +816,8 @@ copy_heap_data(Oid OIDNewHeap, Oid OIDOldHeap, Oid OIDOldIndex,
819816
XLogReportUnloggedStatement(reason);
820817
}
821818

822-
/* use_wal off requiresrd_targblock be initially invalid */
823-
Assert(NewHeap->rd_targblock==InvalidBlockNumber);
819+
/* use_wal off requiressmgr_targblock be initially invalid */
820+
Assert(RelationGetTargetBlock(NewHeap)==InvalidBlockNumber);
824821

825822
/*
826823
* If both tables have TOAST tables, perform toast swap by content. It is

‎src/backend/commands/sequence.c‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.164 2010/01/02 16:57:37 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.165 2010/02/09 21:43:30 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -29,6 +29,7 @@
2929
#include"storage/bufmgr.h"
3030
#include"storage/lmgr.h"
3131
#include"storage/proc.h"
32+
#include"storage/smgr.h"
3233
#include"utils/acl.h"
3334
#include"utils/builtins.h"
3435
#include"utils/lsyscache.h"
@@ -220,7 +221,7 @@ DefineSequence(CreateSeqStmt *seq)
220221
sm->magic=SEQ_MAGIC;
221222

222223
/* hack: ensure heap_insert will insert on the just-created page */
223-
rel->rd_targblock=0;
224+
RelationSetTargetBlock(rel,0);
224225

225226
/* Now form & insert sequence tuple */
226227
tuple=heap_form_tuple(tupDesc,value,null);

‎src/backend/commands/vacuum.c‎

Lines changed: 2 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -14,7 +14,7 @@
1414
*
1515
*
1616
* IDENTIFICATION
17-
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.406 2010/02/08 16:50:21 tgl Exp $
17+
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.407 2010/02/09 21:43:30 tgl Exp $
1818
*
1919
*-------------------------------------------------------------------------
2020
*/
@@ -789,7 +789,6 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, bool do_toast, bool for_wraparound,
789789
Oidsave_userid;
790790
intsave_sec_context;
791791
intsave_nestlevel;
792-
boolheldoff;
793792

794793
if (scanned_all)
795794
*scanned_all= false;
@@ -970,10 +969,9 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, bool do_toast, bool for_wraparound,
970969
cluster_rel(relid,InvalidOid, false,
971970
(vacstmt->options&VACOPT_VERBOSE)!=0,
972971
vacstmt->freeze_min_age,vacstmt->freeze_table_age);
973-
heldoff= false;
974972
}
975973
else
976-
heldoff=lazy_vacuum_rel(onerel,vacstmt,vac_strategy,scanned_all);
974+
lazy_vacuum_rel(onerel,vacstmt,vac_strategy,scanned_all);
977975

978976
/* Roll back any GUC changes executed by index functions */
979977
AtEOXact_GUC(false,save_nestlevel);
@@ -991,10 +989,6 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, bool do_toast, bool for_wraparound,
991989
PopActiveSnapshot();
992990
CommitTransactionCommand();
993991

994-
/* now we can allow interrupts again, if disabled */
995-
if (heldoff)
996-
RESUME_INTERRUPTS();
997-
998992
/*
999993
* If the relation has a secondary toast rel, vacuum that too while we
1000994
* still hold the session lock on the master table. Note however that

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp