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Fix CREATE INDEX CONCURRENTLY to not deadlock against an automatic or manual

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VACUUM that is blocked waiting to get lock on the table being indexed.
Per report and fix suggestion from Greg Stark.
This commit is contained in:
Tom Lane
2008-01-09 21:52:36 +00:00
parent 6a6522529f
commit ceb9360067
3 changed files with 24 additions and 10 deletions
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19
src/backend/commands/indexcmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/indexcmds.c,v 1.169 2008/01/01 19:45:49 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/indexcmds.c,v 1.170 2008/01/09 21:52:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -38,6 +38,7 @@
#include "parser/parse_expr.h"
#include "parser/parse_func.h"
#include "parser/parsetree.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@ -630,11 +631,19 @@ DefineIndex(RangeVar *heapRelation,
* We can exclude any running transactions that have xmin >= the xmax of
* our reference snapshot, since they are clearly not interested in any
* missing older tuples. Transactions in other DBs aren't a problem
* either, since they'll never even be able to see this index. Also,
* GetCurrentVirtualXIDs never reports our own vxid, so we need not check
* for that.
* either, since they'll never even be able to see this index.
*
* We can also exclude autovacuum processes and processes running manual
* lazy VACUUMs, because they won't be fazed by missing index entries
* either. (Manual ANALYZEs, however, can't be excluded because they
* might be within transactions that are going to do arbitrary operations
* later.)
*
* Also, GetCurrentVirtualXIDs never reports our own vxid, so we need not
* check for that.
*/
old_snapshots = GetCurrentVirtualXIDs(ActiveSnapshot->xmax, false);
old_snapshots = GetCurrentVirtualXIDs(ActiveSnapshot->xmax, false,
PROC_IS_AUTOVACUUM | PROC_IN_VACUUM);
while (VirtualTransactionIdIsValid(*old_snapshots))
{