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Allow altering of two_phase option of a SUBSCRIPTION.

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The two_phase option is controlled by both the publisher (as a slot
option) and the subscriber (as a subscription option), so the slot option
must also be modified.

Changing the 'two_phase' option for a subscription from 'true' to 'false'
is permitted only when there are no pending prepared transactions
corresponding to that subscription. Otherwise, the changes of already
prepared transactions can be replicated again along with their corresponding
commit leading to duplicate data or errors.

To avoid data loss, the 'two_phase' option for a subscription can only be
changed from 'false' to 'true' once the initial data synchronization is
completed. Therefore this is performed later by the logical replication worker.

Author: Hayato Kuroda, Ajin Cherian, Amit Kapila
Reviewed-by: Peter Smith, Hou Zhijie, Amit Kapila, Vitaly Davydov, Vignesh C
Discussion: https://postgr.es/m/8fab8-65d74c80-1-2f28e880@39088166
This commit is contained in:
Amit Kapila
2024-07-24 10:13:36 +05:30
parent 774d47b6c0
commit 1462aad2e4
17 changed files with 458 additions and 120 deletions
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10
src/backend/replication/logical/launcher.c
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@@ -272,11 +272,14 @@ logicalrep_worker_find(Oid subid, Oid relid, bool only_running)
* the subscription, instead of just one.
*/
List *
logicalrep_workers_find(Oid subid, bool only_running)
logicalrep_workers_find(Oid subid, bool only_running, bool acquire_lock)
{
int i;
List *res = NIL;
if (acquire_lock)
LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
Assert(LWLockHeldByMe(LogicalRepWorkerLock));
/* Search for attached worker for a given subscription id. */
@@ -288,6 +291,9 @@ logicalrep_workers_find(Oid subid, bool only_running)
res = lappend(res, w);
}
if (acquire_lock)
LWLockRelease(LogicalRepWorkerLock);
return res;
}
@@ -759,7 +765,7 @@ logicalrep_worker_detach(void)
LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
workers = logicalrep_workers_find(MyLogicalRepWorker->subid, true);
workers = logicalrep_workers_find(MyLogicalRepWorker->subid, true, false);
foreach(lc, workers)
{
LogicalRepWorker *w = (LogicalRepWorker *) lfirst(lc);