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Commit953477c

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Fixes for single-page hash index vacuum.
Clear LH_PAGE_HAS_DEAD_TUPLES during replay, similar to what gets donefor btree. Update hashdesc.c for xl_hash_vacuum_one_page.Oversights in commit6977b8b spottedby Amit Kapila. Patch by Ashutosh Sharma.Bump WAL version. The original patch to make hash indexes write-aheadlogged probably should have done this, and the single page vacuumingpatch probably should have done it again, but better late than never.Discussion:http://postgr.es/m/CAA4eK1Kd=mJ9xreovcsh0qMiAj-QqCphHVQ_Lfau1DR9oVjASQ@mail.gmail.com
1 parentbc18126 commit953477c

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6 files changed

+48
-3
lines changed

6 files changed

+48
-3
lines changed

‎src/backend/access/hash/hash.c‎

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -790,6 +790,7 @@ hashbucketcleanup(Relation rel, Bucket cur_bucket, Buffer bucket_buf,
790790
OffsetNumberdeletable[MaxOffsetNumber];
791791
intndeletable=0;
792792
boolretain_pin= false;
793+
boolclear_dead_marking= false;
793794

794795
vacuum_delay_point();
795796

@@ -877,11 +878,14 @@ hashbucketcleanup(Relation rel, Bucket cur_bucket, Buffer bucket_buf,
877878
/*
878879
* Let us mark the page as clean if vacuum removes the DEAD tuples
879880
* from an index page. We do this by clearing LH_PAGE_HAS_DEAD_TUPLES
880-
* flag. Clearing this flag is just a hint; replay won't redo this.
881+
* flag.
881882
*/
882883
if (tuples_removed&&*tuples_removed>0&&
883884
opaque->hasho_flag&LH_PAGE_HAS_DEAD_TUPLES)
885+
{
884886
opaque->hasho_flag &= ~LH_PAGE_HAS_DEAD_TUPLES;
887+
clear_dead_marking= true;
888+
}
885889

886890
MarkBufferDirty(buf);
887891

@@ -891,6 +895,7 @@ hashbucketcleanup(Relation rel, Bucket cur_bucket, Buffer bucket_buf,
891895
xl_hash_deletexlrec;
892896
XLogRecPtrrecptr;
893897

898+
xlrec.clear_dead_marking=clear_dead_marking;
894899
xlrec.is_primary_bucket_page= (buf==bucket_buf) ? true : false;
895900

896901
XLogBeginInsert();

‎src/backend/access/hash/hash_xlog.c‎

Lines changed: 21 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -859,6 +859,19 @@ hash_xlog_delete(XLogReaderState *record)
859859
PageIndexMultiDelete(page,unused,unend-unused);
860860
}
861861

862+
/*
863+
* Mark the page as not containing any LP_DEAD items only if
864+
* clear_dead_marking flag is set to true. See comments in
865+
* hashbucketcleanup() for details.
866+
*/
867+
if (xldata->clear_dead_marking)
868+
{
869+
HashPageOpaquepageopaque;
870+
871+
pageopaque= (HashPageOpaque)PageGetSpecialPointer(page);
872+
pageopaque->hasho_flag &= ~LH_PAGE_HAS_DEAD_TUPLES;
873+
}
874+
862875
PageSetLSN(page,lsn);
863876
MarkBufferDirty(deletebuf);
864877
}
@@ -1078,6 +1091,7 @@ hash_xlog_vacuum_one_page(XLogReaderState *record)
10781091
Buffermetabuf;
10791092
Pagepage;
10801093
XLogRedoActionaction;
1094+
HashPageOpaquepageopaque;
10811095

10821096
xldata= (xl_hash_vacuum_one_page*)XLogRecGetData(record);
10831097

@@ -1126,6 +1140,13 @@ hash_xlog_vacuum_one_page(XLogReaderState *record)
11261140
PageIndexMultiDelete(page,unused,unend-unused);
11271141
}
11281142

1143+
/*
1144+
* Mark the page as not containing any LP_DEAD items. See comments
1145+
* in _hash_vacuum_one_page() for details.
1146+
*/
1147+
pageopaque= (HashPageOpaque)PageGetSpecialPointer(page);
1148+
pageopaque->hasho_flag &= ~LH_PAGE_HAS_DEAD_TUPLES;
1149+
11291150
PageSetLSN(page,lsn);
11301151
MarkBufferDirty(buffer);
11311152
}

‎src/backend/access/hash/hashinsert.c‎

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -374,6 +374,14 @@ _hash_vacuum_one_page(Relation rel, Buffer metabuf, Buffer buf,
374374

375375
PageIndexMultiDelete(page,deletable,ndeletable);
376376

377+
/*
378+
* Mark the page as not containing any LP_DEAD items. This is not
379+
* certainly true (there might be some that have recently been marked,
380+
* but weren't included in our target-item list), but it will almost
381+
* always be true and it doesn't seem worth an additional page scan
382+
* to check it. Remember that LH_PAGE_HAS_DEAD_TUPLES is only a hint
383+
* anyway.
384+
*/
377385
pageopaque= (HashPageOpaque)PageGetSpecialPointer(page);
378386
pageopaque->hasho_flag &= ~LH_PAGE_HAS_DEAD_TUPLES;
379387

‎src/backend/access/rmgrdesc/hashdesc.c‎

Lines changed: 10 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -96,14 +96,23 @@ hash_desc(StringInfo buf, XLogReaderState *record)
9696
{
9797
xl_hash_delete*xlrec= (xl_hash_delete*)rec;
9898

99-
appendStringInfo(buf,"is_primary %c",
99+
appendStringInfo(buf,"clear_dead_marking %c, is_primary %c",
100+
xlrec->clear_dead_marking ?'T' :'F',
100101
xlrec->is_primary_bucket_page ?'T' :'F');
101102
break;
102103
}
103104
caseXLOG_HASH_UPDATE_META_PAGE:
104105
{
105106
xl_hash_update_meta_page*xlrec= (xl_hash_update_meta_page*)rec;
106107

108+
appendStringInfo(buf,"ntuples %g",
109+
xlrec->ntuples);
110+
break;
111+
}
112+
caseXLOG_HASH_VACUUM_ONE_PAGE:
113+
{
114+
xl_hash_vacuum_one_page*xlrec= (xl_hash_vacuum_one_page*)rec;
115+
107116
appendStringInfo(buf,"ntuples %g",
108117
xlrec->ntuples);
109118
break;

‎src/include/access/hash_xlog.h‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -197,6 +197,8 @@ typedef struct xl_hash_squeeze_page
197197
*/
198198
typedefstructxl_hash_delete
199199
{
200+
boolclear_dead_marking;/* TRUE if this operation clears
201+
* LH_PAGE_HAS_DEAD_TUPLES flag */
200202
boolis_primary_bucket_page;/* TRUE if the operation is for
201203
* primary bucket page */
202204
}xl_hash_delete;

‎src/include/access/xlog_internal.h‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -31,7 +31,7 @@
3131
/*
3232
* Each page of XLOG file has a header like this:
3333
*/
34-
#defineXLOG_PAGE_MAGIC0xD095/* can be used as WAL version indicator */
34+
#defineXLOG_PAGE_MAGIC0xD096/* can be used as WAL version indicator */
3535

3636
typedefstructXLogPageHeaderData
3737
{

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