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4974d7f87e
Commit 9da0cc35284, which introduced parallel CREATE INDEX, failed to propagate relmapper.c backend local cache state to parallel worker processes. This could result in parallel index builds against mapped catalog relations where the leader process (participating as a worker) scans the new, pristine relfilenode, while worker processes scan the obsolescent relfilenode. When this happened, the final index structure was typically not consistent with the owning table's structure. The final index structure could contain entries formed from both heap relfilenodes. Only rebuilds on mapped catalog relations that occur as part of a VACUUM FULL or CLUSTER could become corrupt in practice, since their mapped relation relfilenode swap is what allows the inconsistency to arise. On master, fix the problem by propagating the required relmapper.c backend state as part of standard parallel initialization (Cf. commit 29d58fd3). On v11, simply disallow builds against mapped catalog relations by deeming them parallel unsafe. Author: Peter Geoghegan Reported-By: "death lock" Reviewed-By: Tom Lane, Amit Kapila Bug: #15309 Discussion: https://postgr.es/m/153329671686.1405.18298309097348420351@wrigleys.postgresql.org Backpatch: 11-, where parallel CREATE INDEX was introduced.
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* relmapper.h
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* Catalog-to-filenode mapping
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*
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*
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* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/relmapper.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RELMAPPER_H
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#define RELMAPPER_H
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#include "access/xlogreader.h"
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#include "lib/stringinfo.h"
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/* ----------------
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* relmap-related XLOG entries
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* ----------------
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*/
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#define XLOG_RELMAP_UPDATE 0x00
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typedef struct xl_relmap_update
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{
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Oid dbid; /* database ID, or 0 for shared map */
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Oid tsid; /* database's tablespace, or pg_global */
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int32 nbytes; /* size of relmap data */
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char data[FLEXIBLE_ARRAY_MEMBER];
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} xl_relmap_update;
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#define MinSizeOfRelmapUpdate offsetof(xl_relmap_update, data)
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extern Oid RelationMapOidToFilenode(Oid relationId, bool shared);
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extern Oid RelationMapFilenodeToOid(Oid relationId, bool shared);
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extern void RelationMapUpdateMap(Oid relationId, Oid fileNode, bool shared,
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bool immediate);
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extern void RelationMapRemoveMapping(Oid relationId);
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extern void RelationMapInvalidate(bool shared);
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extern void RelationMapInvalidateAll(void);
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extern void AtCCI_RelationMap(void);
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extern void AtEOXact_RelationMap(bool isCommit, bool isParallelWorker);
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extern void AtPrepare_RelationMap(void);
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extern void CheckPointRelationMap(void);
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extern void RelationMapFinishBootstrap(void);
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extern void RelationMapInitialize(void);
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extern void RelationMapInitializePhase2(void);
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extern void RelationMapInitializePhase3(void);
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extern Size EstimateRelationMapSpace(void);
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extern void SerializeRelationMap(Size maxSize, char *startAddress);
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extern void RestoreRelationMap(char *startAddress);
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extern void relmap_redo(XLogReaderState *record);
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extern void relmap_desc(StringInfo buf, XLogReaderState *record);
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extern const char *relmap_identify(uint8 info);
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#endif /* RELMAPPER_H */
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