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Commitdebcec7

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Include the backend ID in the relpath of temporary relations.
This allows us to reliably remove all leftover temporary relationfiles on cluster startup without reference to system catalogs or WAL;therefore, we no longer include temporary relations in XLOG_XACT_COMMITand XLOG_XACT_ABORT WAL records.Since these changes require including a backend ID in eachSharedInvalSmgrMsg, the size of the SharedInvalidationMessage.idfield has been reduced from two bytes to one, and the maximum numberof connections has been reduced from INT_MAX / 4 to 2^23-1. It wouldbe possible to remove these restrictions by increasing the size ofSharedInvalidationMessage by 4 bytes, but right now that doesn't seemlike a good trade-off.Review by Jaime Casanova and Tom Lane.
1 parent3f9479e commitdebcec7

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37 files changed

+668
-342
lines changed

37 files changed

+668
-342
lines changed

‎doc/src/sgml/storage.sgml

Lines changed: 15 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.32 2010/02/16 22:34:43 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.33 2010/08/13 20:10:50 rhaas Exp $ -->
22

33
<chapter id="storage">
44

@@ -133,16 +133,20 @@ there.
133133
</para>
134134

135135
<para>
136-
Each table and index is stored in a separate file, named after the table
137-
or index's <firstterm>filenode</> number, which can be found in
138-
<structname>pg_class</>.<structfield>relfilenode</>. In addition to the
139-
main file (a/k/a main fork), each table and index has a <firstterm>free space
140-
map</> (see <xref linkend="storage-fsm">), which stores information about free
141-
space available in the relation. The free space map is stored in a file named
142-
with the filenode number plus the suffix <literal>_fsm</>. Tables also have a
143-
<firstterm>visibility map</>, stored in a fork with the suffix
144-
<literal>_vm</>, to track which pages are known to have no dead tuples.
145-
The visibility map is described further in <xref linkend="storage-vm">.
136+
Each table and index is stored in a separate file. For ordinary relations,
137+
these files are named after the table or index's <firstterm>filenode</> number,
138+
which can be found in <structname>pg_class</>.<structfield>relfilenode</>. But
139+
for temporary relations, the file name is of the form
140+
<literal>t<replaceable>BBB</>_<replaceable>FFF</></>, where <replaceable>BBB</>
141+
is the backend ID of the backend which created the file, and <replaceable>FFF</>
142+
is the filenode number. In either case, in addition to the main file (a/k/a
143+
main fork), each table and index has a <firstterm>free space map</> (see <xref
144+
linkend="storage-fsm">), which stores information about free space available in
145+
the relation. The free space map is stored in a file named with the filenode
146+
number plus the suffix <literal>_fsm</>. Tables also have a
147+
<firstterm>visibility map</>, stored in a fork with the suffix <literal>_vm</>,
148+
to track which pages are known to have no dead tuples. The visibility map is
149+
described further in <xref linkend="storage-vm">.
146150
</para>
147151

148152
<caution>

‎src/backend/access/heap/visibilitymap.c

Lines changed: 2 additions & 3 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 1.10 2010/04/23 23:21:44 rhaas Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/heap/visibilitymap.c,v 1.11 2010/08/13 20:10:50 rhaas Exp $
1212
*
1313
* INTERFACE ROUTINES
1414
*visibilitymap_clear - clear a bit in the visibility map
@@ -373,8 +373,7 @@ visibilitymap_truncate(Relation rel, BlockNumber nheapblocks)
373373
}
374374

375375
/* Truncate the unused VM pages, and send smgr inval message */
376-
smgrtruncate(rel->rd_smgr,VISIBILITYMAP_FORKNUM,newnblocks,
377-
rel->rd_istemp);
376+
smgrtruncate(rel->rd_smgr,VISIBILITYMAP_FORKNUM,newnblocks);
378377

379378
/*
380379
* We might as well update the local smgr_vm_nblocks setting. smgrtruncate

‎src/backend/access/nbtree/nbtsort.c

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -59,7 +59,7 @@
5959
* Portions Copyright (c) 1994, Regents of the University of California
6060
*
6161
* IDENTIFICATION
62-
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtsort.c,v 1.125 2010/04/28 16:10:40 heikki Exp $
62+
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtsort.c,v 1.126 2010/08/13 20:10:50 rhaas Exp $
6363
*
6464
*-------------------------------------------------------------------------
6565
*/
@@ -295,9 +295,8 @@ _bt_blwritepage(BTWriteState *wstate, Page page, BlockNumber blkno)
295295
}
296296

297297
/*
298-
* Now write the page.We say isTemp = true even if it's not a temp
299-
* index, because there's no need for smgr to schedule an fsync for this
300-
* write; we'll do it ourselves before ending the build.
298+
* Now write the page.There's no need for smgr to schedule an fsync for
299+
* this write; we'll do it ourselves before ending the build.
301300
*/
302301
if (blkno==wstate->btws_pages_written)
303302
{

‎src/backend/access/transam/twophase.c

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
*$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.62 2010/07/06 19:18:55 momjian Exp $
10+
*$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.63 2010/08/13 20:10:50 rhaas Exp $
1111
*
1212
* NOTES
1313
*Each global transaction is associated with a global transaction
@@ -865,8 +865,8 @@ StartPrepare(GlobalTransaction gxact)
865865
hdr.prepared_at=gxact->prepared_at;
866866
hdr.owner=gxact->owner;
867867
hdr.nsubxacts=xactGetCommittedChildren(&children);
868-
hdr.ncommitrels=smgrGetPendingDeletes(true,&commitrels,NULL);
869-
hdr.nabortrels=smgrGetPendingDeletes(false,&abortrels,NULL);
868+
hdr.ncommitrels=smgrGetPendingDeletes(true,&commitrels);
869+
hdr.nabortrels=smgrGetPendingDeletes(false,&abortrels);
870870
hdr.ninvalmsgs=xactGetCommittedInvalidationMessages(&invalmsgs,
871871
&hdr.initfileinval);
872872
StrNCpy(hdr.gid,gxact->gid,GIDSIZE);
@@ -1320,13 +1320,13 @@ FinishPreparedTransaction(const char *gid, bool isCommit)
13201320
}
13211321
for (i=0;i<ndelrels;i++)
13221322
{
1323-
SMgrRelationsrel=smgropen(delrels[i]);
1323+
SMgrRelationsrel=smgropen(delrels[i],InvalidBackendId);
13241324
ForkNumberfork;
13251325

13261326
for (fork=0;fork <=MAX_FORKNUM;fork++)
13271327
{
13281328
if (smgrexists(srel,fork))
1329-
smgrdounlink(srel,fork, false, false);
1329+
smgrdounlink(srel,fork, false);
13301330
}
13311331
smgrclose(srel);
13321332
}

‎src/backend/access/transam/xact.c

Lines changed: 10 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.297 2010/08/1315:42:21 rhaas Exp $
13+
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.298 2010/08/1320:10:50 rhaas Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -912,15 +912,14 @@ RecordTransactionCommit(void)
912912
TransactionIdlatestXid=InvalidTransactionId;
913913
intnrels;
914914
RelFileNode*rels;
915-
boolhaveNonTemp;
916915
intnchildren;
917916
TransactionId*children;
918917
intnmsgs=0;
919918
SharedInvalidationMessage*invalMessages=NULL;
920919
boolRelcacheInitFileInval= false;
921920

922921
/* Get data needed for commit record */
923-
nrels=smgrGetPendingDeletes(true,&rels,&haveNonTemp);
922+
nrels=smgrGetPendingDeletes(true,&rels);
924923
nchildren=xactGetCommittedChildren(&children);
925924
if (XLogStandbyInfoActive())
926925
nmsgs=xactGetCommittedInvalidationMessages(&invalMessages,
@@ -1048,7 +1047,7 @@ RecordTransactionCommit(void)
10481047
* asynchronous commit if all to-be-deleted tables are temporary though,
10491048
* since they are lost anyway if we crash.)
10501049
*/
1051-
if (XactSyncCommit||forceSyncCommit||haveNonTemp)
1050+
if (XactSyncCommit||forceSyncCommit||nrels>0)
10521051
{
10531052
/*
10541053
* Synchronous commit case:
@@ -1334,7 +1333,7 @@ RecordTransactionAbort(bool isSubXact)
13341333
xid);
13351334

13361335
/* Fetch the data we need for the abort record */
1337-
nrels=smgrGetPendingDeletes(false,&rels,NULL);
1336+
nrels=smgrGetPendingDeletes(false,&rels);
13381337
nchildren=xactGetCommittedChildren(&children);
13391338

13401339
/* XXX do we really need a critical section here? */
@@ -4474,15 +4473,15 @@ xact_redo_commit(xl_xact_commit *xlrec, TransactionId xid, XLogRecPtr lsn)
44744473
/* Make sure files supposed to be dropped are dropped */
44754474
for (i=0;i<xlrec->nrels;i++)
44764475
{
4477-
SMgrRelationsrel=smgropen(xlrec->xnodes[i]);
4476+
SMgrRelationsrel=smgropen(xlrec->xnodes[i],InvalidBackendId);
44784477
ForkNumberfork;
44794478

44804479
for (fork=0;fork <=MAX_FORKNUM;fork++)
44814480
{
44824481
if (smgrexists(srel,fork))
44834482
{
44844483
XLogDropRelation(xlrec->xnodes[i],fork);
4485-
smgrdounlink(srel,fork,false,true);
4484+
smgrdounlink(srel,fork, true);
44864485
}
44874486
}
44884487
smgrclose(srel);
@@ -4579,15 +4578,15 @@ xact_redo_abort(xl_xact_abort *xlrec, TransactionId xid)
45794578
/* Make sure files supposed to be dropped are dropped */
45804579
for (i=0;i<xlrec->nrels;i++)
45814580
{
4582-
SMgrRelationsrel=smgropen(xlrec->xnodes[i]);
4581+
SMgrRelationsrel=smgropen(xlrec->xnodes[i],InvalidBackendId);
45834582
ForkNumberfork;
45844583

45854584
for (fork=0;fork <=MAX_FORKNUM;fork++)
45864585
{
45874586
if (smgrexists(srel,fork))
45884587
{
45894588
XLogDropRelation(xlrec->xnodes[i],fork);
4590-
smgrdounlink(srel,fork,false,true);
4589+
smgrdounlink(srel,fork, true);
45914590
}
45924591
}
45934592
smgrclose(srel);
@@ -4661,7 +4660,7 @@ xact_desc_commit(StringInfo buf, xl_xact_commit *xlrec)
46614660
appendStringInfo(buf,"; rels:");
46624661
for (i=0;i<xlrec->nrels;i++)
46634662
{
4664-
char*path=relpath(xlrec->xnodes[i],MAIN_FORKNUM);
4663+
char*path=relpathperm(xlrec->xnodes[i],MAIN_FORKNUM);
46654664

46664665
appendStringInfo(buf," %s",path);
46674666
pfree(path);
@@ -4716,7 +4715,7 @@ xact_desc_abort(StringInfo buf, xl_xact_abort *xlrec)
47164715
appendStringInfo(buf,"; rels:");
47174716
for (i=0;i<xlrec->nrels;i++)
47184717
{
4719-
char*path=relpath(xlrec->xnodes[i],MAIN_FORKNUM);
4718+
char*path=relpathperm(xlrec->xnodes[i],MAIN_FORKNUM);
47204719

47214720
appendStringInfo(buf," %s",path);
47224721
pfree(path);

‎src/backend/access/transam/xlogutils.c

Lines changed: 8 additions & 8 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 1.71 2010/07/08 16:08:30 tgl Exp $
14+
* $PostgreSQL: pgsql/src/backend/access/transam/xlogutils.c,v 1.72 2010/08/13 20:10:50 rhaas Exp $
1515
*
1616
*-------------------------------------------------------------------------
1717
*/
@@ -68,7 +68,7 @@ log_invalid_page(RelFileNode node, ForkNumber forkno, BlockNumber blkno,
6868
*/
6969
if (log_min_messages <=DEBUG1||client_min_messages <=DEBUG1)
7070
{
71-
char*path=relpath(node,forkno);
71+
char*path=relpathperm(node,forkno);
7272

7373
if (present)
7474
elog(DEBUG1,"page %u of relation %s is uninitialized",
@@ -133,7 +133,7 @@ forget_invalid_pages(RelFileNode node, ForkNumber forkno, BlockNumber minblkno)
133133
{
134134
if (log_min_messages <=DEBUG2||client_min_messages <=DEBUG2)
135135
{
136-
char*path=relpath(hentry->key.node,forkno);
136+
char*path=relpathperm(hentry->key.node,forkno);
137137

138138
elog(DEBUG2,"page %u of relation %s has been dropped",
139139
hentry->key.blkno,path);
@@ -166,7 +166,7 @@ forget_invalid_pages_db(Oid dbid)
166166
{
167167
if (log_min_messages <=DEBUG2||client_min_messages <=DEBUG2)
168168
{
169-
char*path=relpath(hentry->key.node,hentry->key.forkno);
169+
char*path=relpathperm(hentry->key.node,hentry->key.forkno);
170170

171171
elog(DEBUG2,"page %u of relation %s has been dropped",
172172
hentry->key.blkno,path);
@@ -200,7 +200,7 @@ XLogCheckInvalidPages(void)
200200
*/
201201
while ((hentry= (xl_invalid_page*)hash_seq_search(&status))!=NULL)
202202
{
203-
char*path=relpath(hentry->key.node,hentry->key.forkno);
203+
char*path=relpathperm(hentry->key.node,hentry->key.forkno);
204204

205205
if (hentry->present)
206206
elog(WARNING,"page %u of relation %s was uninitialized",
@@ -276,7 +276,7 @@ XLogReadBufferExtended(RelFileNode rnode, ForkNumber forknum,
276276
Assert(blkno!=P_NEW);
277277

278278
/* Open the relation at smgr level */
279-
smgr=smgropen(rnode);
279+
smgr=smgropen(rnode,InvalidBackendId);
280280

281281
/*
282282
* Create the target file if it doesn't already exist. This lets us cope
@@ -293,7 +293,7 @@ XLogReadBufferExtended(RelFileNode rnode, ForkNumber forknum,
293293
if (blkno<lastblock)
294294
{
295295
/* page exists in file */
296-
buffer=ReadBufferWithoutRelcache(rnode,false,forknum,blkno,
296+
buffer=ReadBufferWithoutRelcache(rnode,forknum,blkno,
297297
mode,NULL);
298298
}
299299
else
@@ -312,7 +312,7 @@ XLogReadBufferExtended(RelFileNode rnode, ForkNumber forknum,
312312
{
313313
if (buffer!=InvalidBuffer)
314314
ReleaseBuffer(buffer);
315-
buffer=ReadBufferWithoutRelcache(rnode,false,forknum,
315+
buffer=ReadBufferWithoutRelcache(rnode,forknum,
316316
P_NEW,mode,NULL);
317317
lastblock++;
318318
}

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