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First part of refactoring of code for ResolveRecoveryConflict. Purposes

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of this are to centralise the conflict code to allow further change,
as well as to allow passing through the full reason for the conflict
through to the conflicting backends. Backend state alters how we
can handle different types of conflict so this is now required.
As originally suggested by Heikki, no longer optional.
This commit is contained in:
Simon Riggs
2010-01-14 11:08:02 +00:00
parent 0fba3bef55
commit e99767bc28
6 changed files with 144 additions and 151 deletions
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26
src/backend/commands/dbcommands.c
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@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.231 2010/01/10 15:44:28 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.232 2010/01/14 11:08:00 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -1944,29 +1944,7 @@ dbase_redo(XLogRecPtr lsn, XLogRecord *record)
dst_path = GetDatabasePath(xlrec->db_id, xlrec->tablespace_id);
if (InHotStandby)
{
/*
* We don't do ResolveRecoveryConflictWithVirutalXIDs() here since
* that only waits for transactions and completely idle sessions
* would block us. This is rare enough that we do this as simply
* as possible: no wait, just force them off immediately.
*
* No locking is required here because we already acquired
* AccessExclusiveLock. Anybody trying to connect while we do this
* will block during InitPostgres() and then disconnect when they
* see the database has been removed.
*/
while (CountDBBackends(xlrec->db_id) > 0)
{
CancelDBBackends(xlrec->db_id);
/*
* Wait awhile for them to die so that we avoid flooding an
* unresponsive backend when system is heavily loaded.
*/
pg_usleep(10000);
}
}
ResolveRecoveryConflictWithDatabase(xlrec->db_id);
/* Drop pages for this database that are in the shared buffer cache */
DropDatabaseBuffers(xlrec->db_id);