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Create a "relation mapping" infrastructure to support changing the relfilenodes

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of shared or nailed system catalogs.  This has two key benefits:

* The new CLUSTER-based VACUUM FULL can be applied safely to all catalogs.

* We no longer have to use an unsafe reindex-in-place approach for reindexing
  shared catalogs.

CLUSTER on nailed catalogs now works too, although I left it disabled on
shared catalogs because the resulting pg_index.indisclustered update would
only be visible in one database.

Since reindexing shared system catalogs is now fully transactional and
crash-safe, the former special cases in REINDEX behavior have been removed;
shared catalogs are treated the same as non-shared.

This commit does not do anything about the recently-discussed problem of
deadlocks between VACUUM FULL/CLUSTER on a system catalog and other
concurrent queries; will address that in a separate patch.  As a stopgap,
parallel_schedule has been tweaked to run vacuum.sql by itself, to avoid
such failures during the regression tests.
This commit is contained in:
Tom Lane
2010-02-07 20:48:13 +00:00
parent 7fc30c488f
commit b9b8831ad6
54 changed files with 2316 additions and 585 deletions
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4
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.366 2010/02/01 13:40:28 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.367 2010/02/07 20:48:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,6 +53,7 @@
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/ps_status.h"
#include "utils/relmapper.h"
#include "pg_trace.h"
@ -7123,6 +7124,7 @@ CheckPointGuts(XLogRecPtr checkPointRedo, int flags)
CheckPointCLOG();
CheckPointSUBTRANS();
CheckPointMultiXact();
CheckPointRelationMap();
CheckPointBuffers(flags); /* performs all required fsyncs */
/* We deliberately delay 2PC checkpointing as long as possible */
CheckPointTwoPhase(checkPointRedo);