From 351265a6c7fd15737e4b68cada778728fc325a8b Mon Sep 17 00:00:00 2001 From: Fujii Masao Date: Mon, 16 Feb 2026 13:57:38 +0900 Subject: [PATCH] Remove recovery.signal at recovery end when both signal files are present. When both standby.signal and recovery.signal are present, standby.signal takes precedence and the server runs in standby mode. Previously, in this case, recovery.signal was not removed at the end of standby mode (i.e., on promotion) or at the end of archive recovery, while standby.signal was removed. As a result, a leftover recovery.signal could cause a subsequent restart to enter archive recovery unexpectedly, potentially preventing the server from starting. This behavior was surprising and confusing to users. This commit fixes the issue by updating the recovery code to remove recovery.signal alongside standby.signal when both files are present and recovery completes. Because this code path is particularly sensitive and changes in recovery behavior can be risky for stable branches, this change is applied only to the master branch. Reported-by: Nikolay Samokhvalov Author: Fujii Masao Reviewed-by: Michael Paquier Reviewed-by: David Steele Discussion: https://postgr.es/m/CAM527d8PVAQFLt_ndTXE19F-XpDZui861882L0rLY3YihQB8qA@mail.gmail.com --- src/backend/access/transam/xlogrecovery.c | 10 ++++++---- src/test/recovery/t/002_archiving.pl | 18 +++++++++++++++++- 2 files changed, 23 insertions(+), 5 deletions(-) diff --git a/src/backend/access/transam/xlogrecovery.c b/src/backend/access/transam/xlogrecovery.c index 4fc37a031d9..c0c2744d45b 100644 --- a/src/backend/access/transam/xlogrecovery.c +++ b/src/backend/access/transam/xlogrecovery.c @@ -1068,9 +1068,6 @@ readRecoverySignalFile(void) * Check for recovery signal files and if found, fsync them since they * represent server state information. We don't sweat too much about the * possibility of fsync failure, however. - * - * If present, standby signal file takes precedence. If neither is present - * then we won't enter archive recovery. */ if (stat(STANDBY_SIGNAL_FILE, &stat_buf) == 0) { @@ -1085,7 +1082,8 @@ readRecoverySignalFile(void) } standby_signal_file_found = true; } - else if (stat(RECOVERY_SIGNAL_FILE, &stat_buf) == 0) + + if (stat(RECOVERY_SIGNAL_FILE, &stat_buf) == 0) { int fd; @@ -1099,6 +1097,10 @@ readRecoverySignalFile(void) recovery_signal_file_found = true; } + /* + * If both signal files are present, standby signal file takes precedence. + * If neither is present then we won't enter archive recovery. + */ StandbyModeRequested = false; ArchiveRecoveryRequested = false; if (standby_signal_file_found) diff --git a/src/test/recovery/t/002_archiving.pl b/src/test/recovery/t/002_archiving.pl index 883ba75b313..aa40f58e6d6 100644 --- a/src/test/recovery/t/002_archiving.pl +++ b/src/test/recovery/t/002_archiving.pl @@ -115,6 +115,17 @@ $node_standby2->append_conf( recovery_end_command = 'echo recovery_end_failed > missing_dir/xyz.file' )); +# Create recovery.signal and confirm that both signal files exist. +# This is necessary to test how recovery behaves when both files are present, +# i.e., standby.signal should take precedence and both files should be +# removed at the end of recovery. +$node_standby2->set_recovery_mode(); +my $node_standby2_data = $node_standby2->data_dir; +ok(-f "$node_standby2_data/recovery.signal", + "recovery.signal is present at the beginning of recovery"); +ok(-f "$node_standby2_data/standby.signal", + "standby.signal is present at the beginning of recovery"); + $node_standby2->start; # Save the log location, to see the failure of recovery_end_command. @@ -126,7 +137,6 @@ $node_standby2->promote; # Check the logs of the standby to see that the commands have failed. my $log_contents = slurp_file($node_standby2->logfile, $log_location); -my $node_standby2_data = $node_standby2->data_dir; like( $log_contents, @@ -141,4 +151,10 @@ like( qr/WARNING:.*recovery_end_command/s, "recovery_end_command failure detected in logs after promotion"); +# Check that no signal files are present after promotion. +ok( !-f "$node_standby2_data/recovery.signal", + "recovery.signal was left behind after promotion"); +ok( !-f "$node_standby2_data/standby.signal", + "standby.signal was left behind after promotion"); + done_testing(); -- 2.47.3