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Arrange to fsync two-phase-commit state files only during checkpoints;

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given reasonably short lifespans for prepared transactions, this should
mean that only a small minority of state files ever need to be fsynced
at all.  Per discussion with Heikki Linnakangas.
This commit is contained in:
Tom Lane
2005-06-19 20:00:39 +00:00
parent ba90268e2b
commit e26b0abda3
4 changed files with 197 additions and 58 deletions
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15
src/backend/access/transam/xact.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.206 2005/06/18 19:33:41 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.207 2005/06/19 20:00:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1741,19 +1741,6 @@ PrepareTransaction(void)
*/
EndPrepare(gxact);
/*
* Mark the prepared transaction as valid. As soon as we mark ourselves
* not running in MyProc below, others can commit/rollback the xact.
*
* NB: a side effect of this is to make a dummy ProcArray entry for the
* prepared XID. This must happen before we clear the XID from MyProc,
* else there is a window where the XID is not running according to
* TransactionIdInProgress, and onlookers would be entitled to assume
* the xact crashed. Instead we have a window where the same XID
* appears twice in ProcArray, which is OK.
*/
MarkAsPrepared(gxact);
/*
* Now we clean up backend-internal state and release internal
* resources.