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Some of the ambuildempty functions used smgrwrite() directly, followed by smgrimmedsync(). A few small problems with that: Firstly, one is supposed to use smgrextend() when extending a relation, not smgrwrite(). It doesn't make much difference in production builds. smgrextend() updates the relation size cache, so you miss that, but that's harmless because we never use the cached relation size of an init fork. But if you compile with CHECK_WRITE_VS_EXTEND, you get an assertion failure. Secondly, the smgrwrite() calls were performed before WAL-logging, so the page image written to disk had 0/0 as the LSN, not the LSN of the WAL record. That's also harmless in practice, but seems sloppy. Thirdly, it's better to use the buffer cache, because then you don't need to smgrimmedsync() the relation to disk, which adds latency. Bypassing the cache makes sense for bulk operations like index creation, but not when you're just initializing an empty index. Creation of unlogged tables is hardly performance bottleneck in any real world applications, but nevertheless. Backpatch to v16, but no further. These issues should be harmless in practice, so better to not rock the boat in older branches. Reviewed-by: Robert Haas Discussion: https://www.postgresql.org/message-id/6e5bbc08-cdfc-b2b3-9e23-1a914b9850a9@iki.fi
492 lines
13 KiB
C
492 lines
13 KiB
C
/*-------------------------------------------------------------------------
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*
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* blutils.c
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* Bloom index utilities.
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*
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* Portions Copyright (c) 2016-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1990-1993, Regents of the University of California
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*
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* IDENTIFICATION
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* contrib/bloom/blutils.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/amapi.h"
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#include "access/generic_xlog.h"
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#include "access/reloptions.h"
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#include "bloom.h"
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#include "catalog/index.h"
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#include "commands/vacuum.h"
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#include "miscadmin.h"
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#include "storage/bufmgr.h"
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#include "storage/freespace.h"
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#include "storage/indexfsm.h"
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#include "storage/lmgr.h"
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#include "utils/memutils.h"
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/* Signature dealing macros - note i is assumed to be of type int */
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#define GETWORD(x,i) ( *( (BloomSignatureWord *)(x) + ( (i) / SIGNWORDBITS ) ) )
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#define CLRBIT(x,i) GETWORD(x,i) &= ~( 0x01 << ( (i) % SIGNWORDBITS ) )
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#define SETBIT(x,i) GETWORD(x,i) |= ( 0x01 << ( (i) % SIGNWORDBITS ) )
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#define GETBIT(x,i) ( (GETWORD(x,i) >> ( (i) % SIGNWORDBITS )) & 0x01 )
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PG_FUNCTION_INFO_V1(blhandler);
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/* Kind of relation options for bloom index */
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static relopt_kind bl_relopt_kind;
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/* parse table for fillRelOptions */
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static relopt_parse_elt bl_relopt_tab[INDEX_MAX_KEYS + 1];
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static int32 myRand(void);
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static void mySrand(uint32 seed);
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/*
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* Module initialize function: initialize info about Bloom relation options.
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*
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* Note: keep this in sync with makeDefaultBloomOptions().
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*/
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void
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_PG_init(void)
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{
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int i;
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char buf[16];
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bl_relopt_kind = add_reloption_kind();
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/* Option for length of signature */
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add_int_reloption(bl_relopt_kind, "length",
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"Length of signature in bits",
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DEFAULT_BLOOM_LENGTH, 1, MAX_BLOOM_LENGTH,
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AccessExclusiveLock);
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bl_relopt_tab[0].optname = "length";
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bl_relopt_tab[0].opttype = RELOPT_TYPE_INT;
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bl_relopt_tab[0].offset = offsetof(BloomOptions, bloomLength);
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/* Number of bits for each possible index column: col1, col2, ... */
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for (i = 0; i < INDEX_MAX_KEYS; i++)
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{
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snprintf(buf, sizeof(buf), "col%d", i + 1);
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add_int_reloption(bl_relopt_kind, buf,
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"Number of bits generated for each index column",
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DEFAULT_BLOOM_BITS, 1, MAX_BLOOM_BITS,
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AccessExclusiveLock);
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bl_relopt_tab[i + 1].optname = MemoryContextStrdup(TopMemoryContext,
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buf);
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bl_relopt_tab[i + 1].opttype = RELOPT_TYPE_INT;
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bl_relopt_tab[i + 1].offset = offsetof(BloomOptions, bitSize[0]) + sizeof(int) * i;
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}
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}
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/*
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* Construct a default set of Bloom options.
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*/
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static BloomOptions *
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makeDefaultBloomOptions(void)
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{
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BloomOptions *opts;
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int i;
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opts = (BloomOptions *) palloc0(sizeof(BloomOptions));
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/* Convert DEFAULT_BLOOM_LENGTH from # of bits to # of words */
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opts->bloomLength = (DEFAULT_BLOOM_LENGTH + SIGNWORDBITS - 1) / SIGNWORDBITS;
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for (i = 0; i < INDEX_MAX_KEYS; i++)
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opts->bitSize[i] = DEFAULT_BLOOM_BITS;
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SET_VARSIZE(opts, sizeof(BloomOptions));
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return opts;
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}
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/*
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* Bloom handler function: return IndexAmRoutine with access method parameters
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* and callbacks.
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*/
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Datum
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blhandler(PG_FUNCTION_ARGS)
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{
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IndexAmRoutine *amroutine = makeNode(IndexAmRoutine);
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amroutine->amstrategies = BLOOM_NSTRATEGIES;
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amroutine->amsupport = BLOOM_NPROC;
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amroutine->amoptsprocnum = BLOOM_OPTIONS_PROC;
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amroutine->amcanorder = false;
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amroutine->amcanorderbyop = false;
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amroutine->amcanbackward = false;
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amroutine->amcanunique = false;
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amroutine->amcanmulticol = true;
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amroutine->amoptionalkey = true;
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amroutine->amsearcharray = false;
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amroutine->amsearchnulls = false;
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amroutine->amstorage = false;
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amroutine->amclusterable = false;
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amroutine->ampredlocks = false;
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amroutine->amcanparallel = false;
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amroutine->amcaninclude = false;
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amroutine->amusemaintenanceworkmem = false;
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amroutine->amparallelvacuumoptions =
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VACUUM_OPTION_PARALLEL_BULKDEL | VACUUM_OPTION_PARALLEL_CLEANUP;
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amroutine->amkeytype = InvalidOid;
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amroutine->ambuild = blbuild;
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amroutine->ambuildempty = blbuildempty;
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amroutine->aminsert = blinsert;
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amroutine->ambulkdelete = blbulkdelete;
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amroutine->amvacuumcleanup = blvacuumcleanup;
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amroutine->amcanreturn = NULL;
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amroutine->amcostestimate = blcostestimate;
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amroutine->amoptions = bloptions;
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amroutine->amproperty = NULL;
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amroutine->ambuildphasename = NULL;
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amroutine->amvalidate = blvalidate;
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amroutine->amadjustmembers = NULL;
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amroutine->ambeginscan = blbeginscan;
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amroutine->amrescan = blrescan;
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amroutine->amgettuple = NULL;
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amroutine->amgetbitmap = blgetbitmap;
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amroutine->amendscan = blendscan;
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amroutine->ammarkpos = NULL;
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amroutine->amrestrpos = NULL;
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amroutine->amestimateparallelscan = NULL;
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amroutine->aminitparallelscan = NULL;
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amroutine->amparallelrescan = NULL;
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PG_RETURN_POINTER(amroutine);
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}
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/*
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* Fill BloomState structure for particular index.
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*/
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void
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initBloomState(BloomState *state, Relation index)
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{
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int i;
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state->nColumns = index->rd_att->natts;
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/* Initialize hash function for each attribute */
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for (i = 0; i < index->rd_att->natts; i++)
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{
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fmgr_info_copy(&(state->hashFn[i]),
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index_getprocinfo(index, i + 1, BLOOM_HASH_PROC),
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CurrentMemoryContext);
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state->collations[i] = index->rd_indcollation[i];
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}
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/* Initialize amcache if needed with options from metapage */
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if (!index->rd_amcache)
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{
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Buffer buffer;
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Page page;
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BloomMetaPageData *meta;
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BloomOptions *opts;
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opts = MemoryContextAlloc(index->rd_indexcxt, sizeof(BloomOptions));
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buffer = ReadBuffer(index, BLOOM_METAPAGE_BLKNO);
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LockBuffer(buffer, BUFFER_LOCK_SHARE);
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page = BufferGetPage(buffer);
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if (!BloomPageIsMeta(page))
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elog(ERROR, "Relation is not a bloom index");
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meta = BloomPageGetMeta(BufferGetPage(buffer));
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if (meta->magickNumber != BLOOM_MAGICK_NUMBER)
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elog(ERROR, "Relation is not a bloom index");
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*opts = meta->opts;
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UnlockReleaseBuffer(buffer);
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index->rd_amcache = (void *) opts;
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}
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memcpy(&state->opts, index->rd_amcache, sizeof(state->opts));
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state->sizeOfBloomTuple = BLOOMTUPLEHDRSZ +
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sizeof(BloomSignatureWord) * state->opts.bloomLength;
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}
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/*
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* Random generator copied from FreeBSD. Using own random generator here for
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* two reasons:
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*
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* 1) In this case random numbers are used for on-disk storage. Usage of
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* PostgreSQL number generator would obstruct it from all possible changes.
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* 2) Changing seed of PostgreSQL random generator would be undesirable side
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* effect.
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*/
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static int32 next;
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static int32
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myRand(void)
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{
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/*----------
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* Compute x = (7^5 * x) mod (2^31 - 1)
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* without overflowing 31 bits:
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* (2^31 - 1) = 127773 * (7^5) + 2836
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* From "Random number generators: good ones are hard to find",
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* Park and Miller, Communications of the ACM, vol. 31, no. 10,
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* October 1988, p. 1195.
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*----------
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*/
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int32 hi,
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lo,
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x;
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/* Must be in [1, 0x7ffffffe] range at this point. */
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hi = next / 127773;
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lo = next % 127773;
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x = 16807 * lo - 2836 * hi;
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if (x < 0)
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x += 0x7fffffff;
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next = x;
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/* Transform to [0, 0x7ffffffd] range. */
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return (x - 1);
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}
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static void
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mySrand(uint32 seed)
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{
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next = seed;
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/* Transform to [1, 0x7ffffffe] range. */
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next = (next % 0x7ffffffe) + 1;
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}
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/*
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* Add bits of given value to the signature.
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*/
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void
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signValue(BloomState *state, BloomSignatureWord *sign, Datum value, int attno)
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{
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uint32 hashVal;
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int nBit,
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j;
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/*
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* init generator with "column's" number to get "hashed" seed for new
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* value. We don't want to map the same numbers from different columns
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* into the same bits!
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*/
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mySrand(attno);
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/*
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* Init hash sequence to map our value into bits. the same values in
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* different columns will be mapped into different bits because of step
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* above
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*/
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hashVal = DatumGetInt32(FunctionCall1Coll(&state->hashFn[attno], state->collations[attno], value));
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mySrand(hashVal ^ myRand());
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for (j = 0; j < state->opts.bitSize[attno]; j++)
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{
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/* prevent multiple evaluation in SETBIT macro */
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nBit = myRand() % (state->opts.bloomLength * SIGNWORDBITS);
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SETBIT(sign, nBit);
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}
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}
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/*
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* Make bloom tuple from values.
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*/
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BloomTuple *
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BloomFormTuple(BloomState *state, ItemPointer iptr, Datum *values, bool *isnull)
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{
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int i;
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BloomTuple *res = (BloomTuple *) palloc0(state->sizeOfBloomTuple);
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res->heapPtr = *iptr;
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/* Blooming each column */
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for (i = 0; i < state->nColumns; i++)
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{
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/* skip nulls */
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if (isnull[i])
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continue;
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signValue(state, res->sign, values[i], i);
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}
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return res;
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}
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/*
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* Add new bloom tuple to the page. Returns true if new tuple was successfully
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* added to the page. Returns false if it doesn't fit on the page.
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*/
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bool
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BloomPageAddItem(BloomState *state, Page page, BloomTuple *tuple)
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{
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BloomTuple *itup;
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BloomPageOpaque opaque;
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Pointer ptr;
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/* We shouldn't be pointed to an invalid page */
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Assert(!PageIsNew(page) && !BloomPageIsDeleted(page));
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/* Does new tuple fit on the page? */
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if (BloomPageGetFreeSpace(state, page) < state->sizeOfBloomTuple)
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return false;
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/* Copy new tuple to the end of page */
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opaque = BloomPageGetOpaque(page);
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itup = BloomPageGetTuple(state, page, opaque->maxoff + 1);
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memcpy((Pointer) itup, (Pointer) tuple, state->sizeOfBloomTuple);
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/* Adjust maxoff and pd_lower */
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opaque->maxoff++;
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ptr = (Pointer) BloomPageGetTuple(state, page, opaque->maxoff + 1);
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((PageHeader) page)->pd_lower = ptr - page;
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/* Assert we didn't overrun available space */
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Assert(((PageHeader) page)->pd_lower <= ((PageHeader) page)->pd_upper);
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return true;
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}
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/*
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* Allocate a new page (either by recycling, or by extending the index file)
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* The returned buffer is already pinned and exclusive-locked
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* Caller is responsible for initializing the page by calling BloomInitPage
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*/
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Buffer
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BloomNewBuffer(Relation index)
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{
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Buffer buffer;
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/* First, try to get a page from FSM */
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for (;;)
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{
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BlockNumber blkno = GetFreeIndexPage(index);
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if (blkno == InvalidBlockNumber)
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break;
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buffer = ReadBuffer(index, blkno);
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/*
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* We have to guard against the possibility that someone else already
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* recycled this page; the buffer may be locked if so.
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*/
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if (ConditionalLockBuffer(buffer))
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{
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Page page = BufferGetPage(buffer);
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if (PageIsNew(page))
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return buffer; /* OK to use, if never initialized */
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if (BloomPageIsDeleted(page))
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return buffer; /* OK to use */
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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}
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/* Can't use it, so release buffer and try again */
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ReleaseBuffer(buffer);
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}
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/* Must extend the file */
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buffer = ExtendBufferedRel(BMR_REL(index), MAIN_FORKNUM, NULL,
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EB_LOCK_FIRST);
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return buffer;
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}
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/*
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* Initialize any page of a bloom index.
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*/
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void
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BloomInitPage(Page page, uint16 flags)
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{
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BloomPageOpaque opaque;
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PageInit(page, BLCKSZ, sizeof(BloomPageOpaqueData));
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opaque = BloomPageGetOpaque(page);
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opaque->flags = flags;
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opaque->bloom_page_id = BLOOM_PAGE_ID;
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}
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/*
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* Fill in metapage for bloom index.
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*/
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void
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BloomFillMetapage(Relation index, Page metaPage)
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{
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BloomOptions *opts;
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BloomMetaPageData *metadata;
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/*
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* Choose the index's options. If reloptions have been assigned, use
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* those, otherwise create default options.
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*/
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opts = (BloomOptions *) index->rd_options;
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if (!opts)
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opts = makeDefaultBloomOptions();
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/*
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* Initialize contents of meta page, including a copy of the options,
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* which are now frozen for the life of the index.
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*/
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BloomInitPage(metaPage, BLOOM_META);
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metadata = BloomPageGetMeta(metaPage);
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memset(metadata, 0, sizeof(BloomMetaPageData));
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metadata->magickNumber = BLOOM_MAGICK_NUMBER;
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metadata->opts = *opts;
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((PageHeader) metaPage)->pd_lower += sizeof(BloomMetaPageData);
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/* If this fails, probably FreeBlockNumberArray size calc is wrong: */
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Assert(((PageHeader) metaPage)->pd_lower <= ((PageHeader) metaPage)->pd_upper);
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}
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/*
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* Initialize metapage for bloom index.
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*/
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void
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BloomInitMetapage(Relation index, ForkNumber forknum)
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{
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Buffer metaBuffer;
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Page metaPage;
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GenericXLogState *state;
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/*
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* Make a new page; since it is first page it should be associated with
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* block number 0 (BLOOM_METAPAGE_BLKNO). No need to hold the extension
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* lock because there cannot be concurrent inserters yet.
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*/
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metaBuffer = ReadBufferExtended(index, forknum, P_NEW, RBM_NORMAL, NULL);
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LockBuffer(metaBuffer, BUFFER_LOCK_EXCLUSIVE);
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Assert(BufferGetBlockNumber(metaBuffer) == BLOOM_METAPAGE_BLKNO);
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/* Initialize contents of meta page */
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state = GenericXLogStart(index);
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metaPage = GenericXLogRegisterBuffer(state, metaBuffer,
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GENERIC_XLOG_FULL_IMAGE);
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BloomFillMetapage(index, metaPage);
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GenericXLogFinish(state);
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UnlockReleaseBuffer(metaBuffer);
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}
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/*
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* Parse reloptions for bloom index, producing a BloomOptions struct.
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*/
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bytea *
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bloptions(Datum reloptions, bool validate)
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{
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BloomOptions *rdopts;
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/* Parse the user-given reloptions */
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rdopts = (BloomOptions *) build_reloptions(reloptions, validate,
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bl_relopt_kind,
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sizeof(BloomOptions),
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bl_relopt_tab,
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lengthof(bl_relopt_tab));
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/* Convert signature length from # of bits to # to words, rounding up */
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if (rdopts)
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rdopts->bloomLength = (rdopts->bloomLength + SIGNWORDBITS - 1) / SIGNWORDBITS;
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return (bytea *) rdopts;
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}
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