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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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20
src/backend/storage/ipc/procarray.c
View File

@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.58 2010/01/21 00:53:58 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.59 2010/01/23 16:37:12 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -1680,15 +1680,13 @@ GetCurrentVirtualXIDs(TransactionId limitXmin, bool excludeXmin0,
* latestCompletedXid since doing so would be a performance issue during
* normal running, so we check it essentially for free on the standby.
*
* If dbOid is valid we skip backends attached to other databases. Some
* callers choose to skipExistingConflicts.
* If dbOid is valid we skip backends attached to other databases.
*
* Be careful to *not* pfree the result from this function. We reuse
* this array sufficiently often that we use malloc for the result.
*/
VirtualTransactionId *
GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid,
bool skipExistingConflicts)
GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid)
{
static VirtualTransactionId *vxids;
ProcArrayStruct *arrayP = procArray;
@ -1727,9 +1725,6 @@ GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid,
if (proc->pid == 0)
continue;
if (skipExistingConflicts && proc->recoveryConflictPending)
continue;
if (!OidIsValid(dbOid) ||
proc->databaseId == dbOid)
{
@ -1886,7 +1881,7 @@ CountDBBackends(Oid databaseid)
* CancelDBBackends --- cancel backends that are using specified database
*/
void
CancelDBBackends(Oid databaseid)
CancelDBBackends(Oid databaseid, ProcSignalReason sigmode, bool conflictPending)
{
ProcArrayStruct *arrayP = procArray;
int index;
@ -1899,13 +1894,13 @@ CancelDBBackends(Oid databaseid)
{
volatile PGPROC *proc = arrayP->procs[index];
if (proc->databaseId == databaseid)
if (databaseid == InvalidOid || proc->databaseId == databaseid)
{
VirtualTransactionId procvxid;
GET_VXID_FROM_PGPROC(procvxid, *proc);
proc->recoveryConflictPending = true;
proc->recoveryConflictPending = conflictPending;
pid = proc->pid;
if (pid != 0)
{
@ -1913,8 +1908,7 @@ CancelDBBackends(Oid databaseid)
* Kill the pid if it's still here. If not, that's what we wanted
* so ignore any errors.
*/
(void) SendProcSignal(pid, PROCSIG_RECOVERY_CONFLICT_DATABASE,
procvxid.backendId);
(void) SendProcSignal(pid, sigmode, procvxid.backendId);
}
}
}