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Change the autovacuum launcher to read pg_database directly, rather than

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via the "flat files" facility.  This requires making it enough like a backend
to be able to run transactions; it's no longer an "auxiliary process" but
more like the autovacuum worker processes.  Also, its signal handling has
to be brought into line with backends/workers.  In particular, since it
now has to handle procsignal.c processing, the special autovac-launcher-only
signal conditions are moved to SIGUSR2.

Alvaro, with some cleanup from Tom
This commit is contained in:
Tom Lane
2009-08-31 19:41:00 +00:00
parent 25ec228ef7
commit 00e6a16d01
8 changed files with 140 additions and 141 deletions
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25
src/backend/utils/init/postinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.195 2009/08/29 19:26:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.196 2009/08/31 19:41:00 tgl Exp $
*
*
*-------------------------------------------------------------------------
@ -460,7 +460,9 @@ BaseInit(void)
* name can be returned to the caller in out_dbname. If out_dbname isn't
* NULL, it must point to a buffer of size NAMEDATALEN.
*
* In bootstrap mode no parameters are used.
* In bootstrap mode no parameters are used. The autovacuum launcher process
* doesn't use any parameters either, because it only goes far enough to be
* able to read pg_database; it doesn't connect to any particular database.
*
* The return value indicates whether the userID is a superuser. (That
* can only be tested inside a transaction, so we want to do it during
@ -537,6 +539,12 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
if (!bootstrap)
pgstat_initialize();
/*
* Load relcache entries for the shared system catalogs. This must
* create at least an entry for pg_database.
*/
RelationCacheInitializePhase2();
/*
* Set up process-exit callback to do pre-shutdown cleanup. This has to
* be after we've initialized all the low-level modules like the buffer
@ -548,10 +556,17 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
*/
on_shmem_exit(ShutdownPostgres, 0);
/* The autovacuum launcher is done here */
if (IsAutoVacuumLauncherProcess())
return true; /* result doesn't matter */
/*
* Start a new transaction here before first access to db, and get a
* snapshot. We don't have a use for the snapshot itself, but we're
* interested in the secondary effect that it sets RecentGlobalXmin.
* (This is critical for anything that reads heap pages, because HOT
* may decide to prune them even if the process doesn't attempt to
* modify any tuples.)
*/
if (!bootstrap)
{
@ -559,12 +574,6 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
(void) GetTransactionSnapshot();
}
/*
* Load relcache entries for the shared system catalogs. This must
* create at least an entry for pg_database.
*/
RelationCacheInitializePhase2();
/*
* Set up the global variables holding database id and default tablespace.
* But note we won't actually try to touch the database just yet.