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

Commitabaffa9

Browse files
committed
Fix contrib/bloom to work for unlogged indexes.
blbuildempty did not do even approximately the right thing: it triedto add a metapage to the relation's regular data fork, which alreadyhas one at that point. It should look like the ambuildempty methodsfor all the standard index types, ie, initialize a metapage image insome transient storage and then write it directly to the init fork.To support that, refactor BloomInitMetapage into two functions.In passing, fix BloomInitMetapage so it doesn't leave the rd_optionsfield of the index's relcache entry pointing at transient storage.I'm not sure this had any visible consequence, since nothing muchelse is likely to look at a bloom index's rd_options, but it'scertainly poor practice.Per bug #14155 from Zhou Digoal.Report: <20160524144146.22598.42558@wrigleys.postgresql.org>
1 parent2e8b4bf commitabaffa9

File tree

5 files changed

+144
-25
lines changed

5 files changed

+144
-25
lines changed

‎contrib/bloom/blinsert.c

Lines changed: 20 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -18,6 +18,7 @@
1818
#include"miscadmin.h"
1919
#include"storage/bufmgr.h"
2020
#include"storage/indexfsm.h"
21+
#include"storage/smgr.h"
2122
#include"utils/memutils.h"
2223
#include"utils/rel.h"
2324

@@ -159,12 +160,26 @@ blbuild(Relation heap, Relation index, IndexInfo *indexInfo)
159160
void
160161
blbuildempty(Relationindex)
161162
{
162-
if (RelationGetNumberOfBlocks(index)!=0)
163-
elog(ERROR,"index \"%s\" already contains data",
164-
RelationGetRelationName(index));
163+
Pagemetapage;
165164

166-
/* Initialize the meta page */
167-
BloomInitMetapage(index);
165+
/* Construct metapage. */
166+
metapage= (Page)palloc(BLCKSZ);
167+
BloomFillMetapage(index,metapage);
168+
169+
/* Write the page. If archiving/streaming, XLOG it. */
170+
PageSetChecksumInplace(metapage,BLOOM_METAPAGE_BLKNO);
171+
smgrwrite(index->rd_smgr,INIT_FORKNUM,BLOOM_METAPAGE_BLKNO,
172+
(char*)metapage, true);
173+
if (XLogIsNeeded())
174+
log_newpage(&index->rd_smgr->smgr_rnode.node,INIT_FORKNUM,
175+
BLOOM_METAPAGE_BLKNO,metapage, false);
176+
177+
/*
178+
* An immediate sync is required even if we xlog'd the page, because the
179+
* write did not go through shared_buffers and therefore a concurrent
180+
* checkpoint may have moved the redo pointer past our xlog record.
181+
*/
182+
smgrimmedsync(index->rd_smgr,INIT_FORKNUM);
168183
}
169184

170185
/*

‎contrib/bloom/bloom.h

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -166,6 +166,7 @@ typedef BloomScanOpaqueData *BloomScanOpaque;
166166
externvoid_PG_init(void);
167167
externDatumblhandler(PG_FUNCTION_ARGS);
168168
externvoidinitBloomState(BloomState*state,Relationindex);
169+
externvoidBloomFillMetapage(Relationindex,PagemetaPage);
169170
externvoidBloomInitMetapage(Relationindex);
170171
externvoidBloomInitPage(Pagepage,uint16flags);
171172
externBufferBloomNewBuffer(Relationindex);

‎contrib/bloom/blutils.c

Lines changed: 43 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -346,7 +346,7 @@ BloomNewBuffer(Relation index)
346346
}
347347

348348
/*
349-
* Initializebloom page.
349+
* Initializeany page of a bloom index.
350350
*/
351351
void
352352
BloomInitPage(Pagepage,uint16flags)
@@ -363,6 +363,8 @@ BloomInitPage(Page page, uint16 flags)
363363

364364
/*
365365
* Adjust options of bloom index.
366+
*
367+
* This must produce default options when *opts is initially all-zero.
366368
*/
367369
staticvoid
368370
adjustBloomOptions(BloomOptions*opts)
@@ -378,7 +380,7 @@ adjustBloomOptions(BloomOptions *opts)
378380
errmsg("length of bloom signature (%d) is greater than maximum %d",
379381
opts->bloomLength,MAX_BLOOM_LENGTH)));
380382

381-
/* Checksingnature length */
383+
/* Checksignature length */
382384
for (i=0;i<INDEX_MAX_KEYS;i++)
383385
{
384386
/*
@@ -392,46 +394,67 @@ adjustBloomOptions(BloomOptions *opts)
392394
}
393395
}
394396

397+
/*
398+
* Fill in metapage for bloom index.
399+
*/
400+
void
401+
BloomFillMetapage(Relationindex,PagemetaPage)
402+
{
403+
BloomOptions*opts;
404+
BloomMetaPageData*metadata;
405+
406+
/*
407+
* Choose the index's options. If reloptions have been assigned, use
408+
* those, otherwise create default options by applying adjustBloomOptions
409+
* to a zeroed chunk of memory. We apply adjustBloomOptions to existing
410+
* reloptions too, just out of paranoia; they should be valid already.
411+
*/
412+
opts= (BloomOptions*)index->rd_options;
413+
if (!opts)
414+
opts= (BloomOptions*)palloc0(sizeof(BloomOptions));
415+
adjustBloomOptions(opts);
416+
417+
/*
418+
* Initialize contents of meta page, including a copy of the options,
419+
* which are now frozen for the life of the index.
420+
*/
421+
BloomInitPage(metaPage,BLOOM_META);
422+
metadata=BloomPageGetMeta(metaPage);
423+
memset(metadata,0,sizeof(BloomMetaPageData));
424+
metadata->magickNumber=BLOOM_MAGICK_NUMBER;
425+
metadata->opts=*opts;
426+
((PageHeader)metaPage)->pd_lower+=sizeof(BloomMetaPageData);
427+
}
428+
395429
/*
396430
* Initialize metapage for bloom index.
397431
*/
398432
void
399433
BloomInitMetapage(Relationindex)
400434
{
401-
PagemetaPage;
402435
BuffermetaBuffer;
403-
BloomMetaPageData*metadata;
436+
PagemetaPage;
404437
GenericXLogState*state;
405438

406439
/*
407-
* Make a newbuffer, since it firstbuffer it should be associated with
440+
* Make a newpage; since itisfirstpage it should be associated with
408441
* block number 0 (BLOOM_METAPAGE_BLKNO).
409442
*/
410443
metaBuffer=BloomNewBuffer(index);
411444
Assert(BufferGetBlockNumber(metaBuffer)==BLOOM_METAPAGE_BLKNO);
412445

413-
/* Initialize bloom index options */
414-
if (!index->rd_options)
415-
index->rd_options=palloc0(sizeof(BloomOptions));
416-
adjustBloomOptions((BloomOptions*)index->rd_options);
417-
418446
/* Initialize contents of meta page */
419447
state=GenericXLogStart(index);
420-
metaPage=GenericXLogRegisterBuffer(state,metaBuffer,GENERIC_XLOG_FULL_IMAGE);
421-
422-
BloomInitPage(metaPage,BLOOM_META);
423-
metadata=BloomPageGetMeta(metaPage);
424-
memset(metadata,0,sizeof(BloomMetaPageData));
425-
metadata->magickNumber=BLOOM_MAGICK_NUMBER;
426-
metadata->opts=*((BloomOptions*)index->rd_options);
427-
((PageHeader)metaPage)->pd_lower+=sizeof(BloomMetaPageData);
428-
448+
metaPage=GenericXLogRegisterBuffer(state,metaBuffer,
449+
GENERIC_XLOG_FULL_IMAGE);
450+
BloomFillMetapage(index,metaPage);
429451
GenericXLogFinish(state);
452+
430453
UnlockReleaseBuffer(metaBuffer);
431454
}
432455

433456
/*
434-
*Initialize options for bloom index.
457+
*Parse reloptions for bloom index, producing a BloomOptions struct.
435458
*/
436459
bytea*
437460
bloptions(Datumreloptions,boolvalidate)

‎contrib/bloom/expected/bloom.out

Lines changed: 58 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -138,6 +138,64 @@ SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
138138
13
139139
(1 row)
140140

141+
-- Try an unlogged table too
142+
CREATE UNLOGGED TABLE tstu (
143+
iint4,
144+
ttext
145+
);
146+
INSERT INTO tstu SELECT i%10, substr(md5(i::text), 1, 1) FROM generate_series(1,2000) i;
147+
CREATE INDEX bloomidxu ON tstu USING bloom (i, t) WITH (col2 = 4);
148+
SET enable_seqscan=off;
149+
SET enable_bitmapscan=on;
150+
SET enable_indexscan=on;
151+
EXPLAIN (COSTS OFF) SELECT count(*) FROM tstu WHERE i = 7;
152+
QUERY PLAN
153+
--------------------------------------------
154+
Aggregate
155+
-> Bitmap Heap Scan on tstu
156+
Recheck Cond: (i = 7)
157+
-> Bitmap Index Scan on bloomidxu
158+
Index Cond: (i = 7)
159+
(5 rows)
160+
161+
EXPLAIN (COSTS OFF) SELECT count(*) FROM tstu WHERE t = '5';
162+
QUERY PLAN
163+
--------------------------------------------
164+
Aggregate
165+
-> Bitmap Heap Scan on tstu
166+
Recheck Cond: (t = '5'::text)
167+
-> Bitmap Index Scan on bloomidxu
168+
Index Cond: (t = '5'::text)
169+
(5 rows)
170+
171+
EXPLAIN (COSTS OFF) SELECT count(*) FROM tstu WHERE i = 7 AND t = '5';
172+
QUERY PLAN
173+
---------------------------------------------------------
174+
Aggregate
175+
-> Bitmap Heap Scan on tstu
176+
Recheck Cond: ((i = 7) AND (t = '5'::text))
177+
-> Bitmap Index Scan on bloomidxu
178+
Index Cond: ((i = 7) AND (t = '5'::text))
179+
(5 rows)
180+
181+
SELECT count(*) FROM tstu WHERE i = 7;
182+
count
183+
-------
184+
200
185+
(1 row)
186+
187+
SELECT count(*) FROM tstu WHERE t = '5';
188+
count
189+
-------
190+
112
191+
(1 row)
192+
193+
SELECT count(*) FROM tstu WHERE i = 7 AND t = '5';
194+
count
195+
-------
196+
13
197+
(1 row)
198+
141199
RESET enable_seqscan;
142200
RESET enable_bitmapscan;
143201
RESET enable_indexscan;

‎contrib/bloom/sql/bloom.sql

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -50,6 +50,28 @@ SELECT count(*) FROM tst WHERE i = 7;
5050
SELECTcount(*)FROM tstWHERE t='5';
5151
SELECTcount(*)FROM tstWHERE i=7AND t='5';
5252

53+
-- Try an unlogged table too
54+
55+
CREATE UNLOGGED TABLE tstu (
56+
iint4,
57+
ttext
58+
);
59+
60+
INSERT INTO tstuSELECT i%10, substr(md5(i::text),1,1)FROM generate_series(1,2000) i;
61+
CREATEINDEXbloomidxuON tstu USING bloom (i, t) WITH (col2=4);
62+
63+
SET enable_seqscan=off;
64+
SET enable_bitmapscan=on;
65+
SET enable_indexscan=on;
66+
67+
EXPLAIN (COSTS OFF)SELECTcount(*)FROM tstuWHERE i=7;
68+
EXPLAIN (COSTS OFF)SELECTcount(*)FROM tstuWHERE t='5';
69+
EXPLAIN (COSTS OFF)SELECTcount(*)FROM tstuWHERE i=7AND t='5';
70+
71+
SELECTcount(*)FROM tstuWHERE i=7;
72+
SELECTcount(*)FROM tstuWHERE t='5';
73+
SELECTcount(*)FROM tstuWHERE i=7AND t='5';
74+
5375
RESET enable_seqscan;
5476
RESET enable_bitmapscan;
5577
RESET enable_indexscan;

0 commit comments

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