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In HS, Startup process sets SIGALRM when waiting for buffer pin. If

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woken by alarm we send SIGUSR1 to all backends requesting that they
check to see if they are blocking Startup process. If so, they throw
ERROR/FATAL as for other conflict resolutions. Deadlock stop gap
removed. max_standby_delay = -1 option removed to prevent deadlock.
This commit is contained in:
Simon Riggs
2010-01-23 16:37:12 +00:00
parent 4fa69e566c
commit 959ac58c04
16 changed files with 367 additions and 87 deletions
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14
src/backend/tcop/postgres.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.585 2010/01/21 09:30:36 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.586 2010/01/23 16:37:12 sriggs Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@@ -2718,6 +2718,18 @@ RecoveryConflictInterrupt(ProcSignalReason reason)
{
switch (reason)
{
case PROCSIG_RECOVERY_CONFLICT_BUFFERPIN:
/*
* If we aren't blocking the Startup process there is
* nothing more to do.
*/
if (!HoldingBufferPinThatDelaysRecovery())
return;
MyProc->recoveryConflictPending = true;
/* Intentional drop through to error handling */
case PROCSIG_RECOVERY_CONFLICT_LOCK:
case PROCSIG_RECOVERY_CONFLICT_TABLESPACE:
case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT: