From 32d7480e02eef139265ece8c2b8842c0b3cb1127 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Sat, 5 Aug 2017 20:52:53 -0700 Subject: [PATCH] Fix thinko introduced in 2bef06d516460 et al. The callers for GetOldestSafeDecodingTransactionId() all inverted the argument for the argument introduced in 2bef06d516460. Luckily this appears to be inconsequential for the moment, as we wait for concurrent in-progress transaction when assembling a snapshot. Additionally this could only make a difference when adding a second logical slot, because only a pre-existing slot could cause an issue by lowering the returned xid dangerously much. Reported-By: Antonin Houska Discussion: https://postgr.es/m/32704.1496993134@localhost Backport: 9.4-, where 2bef06d516460 was backpatched to. --- src/backend/replication/logical/logical.c | 2 +- src/backend/replication/logical/snapbuild.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/backend/replication/logical/logical.c b/src/backend/replication/logical/logical.c index 3ea80253d3..f44533eb7f 100644 --- a/src/backend/replication/logical/logical.c +++ b/src/backend/replication/logical/logical.c @@ -284,7 +284,7 @@ CreateInitDecodingContext(char *plugin, */ LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE); - xmin_horizon = GetOldestSafeDecodingTransactionId(need_full_snapshot); + xmin_horizon = GetOldestSafeDecodingTransactionId(!need_full_snapshot); slot->effective_catalog_xmin = xmin_horizon; slot->data.catalog_xmin = xmin_horizon; diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c index 43ec8e4943..901e95ede4 100644 --- a/src/backend/replication/logical/snapbuild.c +++ b/src/backend/replication/logical/snapbuild.c @@ -592,7 +592,7 @@ SnapBuildExportSnapshot(SnapBuild *builder) TransactionId safeXid; LWLockAcquire(ProcArrayLock, LW_SHARED); - safeXid = GetOldestSafeDecodingTransactionId(true); + safeXid = GetOldestSafeDecodingTransactionId(false); LWLockRelease(ProcArrayLock); Assert(TransactionIdPrecedesOrEquals(safeXid, snap->xmin));