This commit standardizes the output format for LSNs to ensure consistent
representation across various tools and messages. Previously, LSNs were
inconsistently printed as `%X/%X` in some contexts, while others used
zero-padding. This often led to confusion when comparing.
To address this, the LSN format is now uniformly set to `%X/%08X`,
ensuring the lower 32-bit part is always zero-padded to eight
hexadecimal digits.
Author: Japin Li <japinli@hotmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/ME0P300MB0445CA53CA0E4B8C1879AF84B641A@ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM
CONTEXT: processing remote data for replication origin "pg_16395" during "INSERT" for replication target relation "public.test" in transaction 725 finished at 0/14C0378
CONTEXT: processing remote data for replication origin "pg_16395" during "INSERT" for replication target relation "public.test" in transaction 725 finished at 0/014C0378
</screen>
The LSN of the transaction that contains the change violating the constraint and
the replication origin name can be found from the server log (LSN 0/14C0378 and
the replication origin name can be found from the server log (LSN 0/014C0378 and
replication origin <literal>pg_16395</literal> in the above case). The
transaction that produced the conflict can be skipped by using
@ -431,7 +431,7 @@ postgres=# select * from pg_logical_slot_get_changes('regression_slot', NULL, NU
cases, the following log message may appear:
<programlisting>
LOG: could not synchronize replication slot "failover_slot"
DETAIL: Synchronization could lead to data loss as the remote slot needs WAL at LSN 0/3003F28 and catalog xmin 754, but the standby has LSN 0/3003F28 and catalog xmin 756
DETAIL: Synchronization could lead to data loss as the remote slot needs WAL at LSN 0/03003F28 and catalog xmin 754, but the standby has LSN 0/03003F28 and catalog xmin 756
</programlisting>
If the logical replication slot is actively used by a consumer, no
manual intervention is needed; the slot will advance automatically,
(errmsg("requested timeline %u is not a child of this server's history",
recoveryTargetTLI),
/* translator: %s is a backup_label file or a pg_control file */
errdetail("Latest checkpoint in file \"%s\" is at %X/%X on timeline %u, but in the history of the requested timeline, the server forked off from that timeline at %X/%X.",
errdetail("Latest checkpoint in file \"%s\" is at %X/%08X on timeline %u, but in the history of the requested timeline, the server forked off from that timeline at %X/%08X.",
elog(DEBUG1,"failed to increase restart lsn: proposed %X/%X, after %X/%X, current candidate %X/%X, current after %X/%X, flushed up to %X/%X",
elog(DEBUG1,"failed to increase restart lsn: proposed %X/%08X, after %X/%08X, current candidate %X/%08X, current after %X/%08X, flushed up to %X/%08X",
errmsg("could not synchronize replication slot \"%s\"",
remote_slot->name),
errdetail("Synchronization could lead to data loss, because the remote slot needs WAL at LSN %X/%X and catalog xmin %u, but the standby has LSN %X/%X and catalog xmin %u.",
errdetail("Synchronization could lead to data loss, because the remote slot needs WAL at LSN %X/%08X and catalog xmin %u, but the standby has LSN %X/%08X and catalog xmin %u.",
LSN_FORMAT_ARGS(remote_slot->restart_lsn),
remote_slot->catalog_xmin,
LSN_FORMAT_ARGS(slot->data.restart_lsn),
@ -275,7 +275,7 @@ update_local_synced_slot(RemoteSlot *remote_slot, Oid remote_dbid,
ereport(ERROR,
errmsg_internal("synchronized confirmed_flush for slot \"%s\" differs from remote slot",
remote_slot->name),
errdetail_internal("Remote slot has LSN %X/%X but local slot has LSN %X/%X.",
errdetail_internal("Remote slot has LSN %X/%08X but local slot has LSN %X/%08X.",
LSN_FORMAT_ARGS(remote_slot->confirmed_lsn),
LSN_FORMAT_ARGS(slot->data.confirmed_flush)));
}
@ -593,7 +593,7 @@ update_and_persist_local_synced_slot(RemoteSlot *remote_slot, Oid remote_dbid)
{
ereport(LOG,
errmsg("could not synchronize replication slot \"%s\"",remote_slot->name),
errdetail("Synchronization could lead to data loss, because the standby could not build a consistent snapshot to decode WALs at LSN %X/%X.",
errdetail("Synchronization could lead to data loss, because the standby could not build a consistent snapshot to decode WALs at LSN %X/%08X.",
LSN_FORMAT_ARGS(slot->data.restart_lsn)));
returnfalse;
@ -642,7 +642,7 @@ synchronize_one_slot(RemoteSlot *remote_slot, Oid remote_dbid)
errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u, finished at %X/%X",
errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u, finished at %X/%08X",
errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u, finished at %X/%X",
errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u, finished at %X/%08X",
regress_testsub4 | regress_subscription_user | f | {testpub} | f | parallel | d | f | none | t | f | f | off | dbname=regress_doesnotexist | 0/00000000
(1 row)
ALTER SUBSCRIPTION regress_testsub4 SET (origin = any);
\dRs+ regress_testsub4
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | f | t | f | off | dbname=regress_doesnotexist2 | 0/0
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | f | t | f | off | dbname=regress_doesnotexist2 | 0/00000000
(1 row)
ALTER SUBSCRIPTION regress_testsub SET (password_required = true);
regress_testsub | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | t | f | f | off | dbname=regress_doesnotexist2 | 0/12345
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | t | f | f | off | dbname=regress_doesnotexist2 | 0/00012345
regress_testsub | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | t | f | f | off | dbname=regress_doesnotexist2 | 0/0
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | t | f | f | off | dbname=regress_doesnotexist2 | 0/00000000
(1 row)
BEGIN;
@ -223,10 +223,10 @@ ALTER SUBSCRIPTION regress_testsub_foo SET (synchronous_commit = foobar);
ERROR: invalid value for parameter "synchronous_commit": "foobar"
HINT: Available values: local, remote_write, remote_apply, on, off.
\dRs+
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub_foo | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | t | f | f | local | dbname=regress_doesnotexist2 | 0/0
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub_foo | regress_subscription_user | f | {testpub2,testpub3} | f | parallel | d | f | any | t | f | f | local | dbname=regress_doesnotexist2 | 0/00000000
regress_testsub | regress_subscription_user | f | {testpub,testpub1,testpub2} | f | off | d | f | any | t | f | f | off | dbname=regress_doesnotexist | 0/0
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
regress_testsub | regress_subscription_user | f | {testpub,testpub1,testpub2} | f | off | d | f | any | t | f | f | off | dbname=regress_doesnotexist | 0/00000000
(1 row)
-- fail - publication used more than once
@ -332,10 +332,10 @@ ERROR: publication "testpub3" is not in subscription "regress_testsub"
-- ok - delete publications
ALTER SUBSCRIPTION regress_testsub DROP PUBLICATION testpub1, testpub2 WITH (refresh = false);
\dRs+
List of subscriptions
Name | Owner | Enabled | Publication | Binary | Streaming | Two-phase commit | Disable on error | Origin | Password required | Run as owner? | Failover | Synchronous commit | Conninfo | Skip LSN
Álvaro Herrera
6 months ago