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Add seq_sync_error_count to subscription statistics.

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This commit adds a new column, seq_sync_error_count, to the
pg_stat_subscription_stats view. This counter tracks the number of errors
encountered by the sequence synchronization worker during operation.

Since a single worker handles the synchronization of all sequences, this
value may reflect errors from multiple sequences. This addition improves
observability of sequence synchronization behavior and helps monitor
potential issues during replication.

Author: Vignesh C <vignesh21@gmail.com>
Reviewed-by: shveta malik <shveta.malik@gmail.com>
Reviewed-by: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CAA4eK1LC+KJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ@mail.gmail.com
This commit is contained in:
Amit Kapila
2025-11-07 08:05:08 +00:00
parent c32e32f763
commit f6a4c498dc
12 changed files with 143 additions and 62 deletions
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2
src/include/catalog/catversion.h
View File

@@ -57,6 +57,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 202511051
#define CATALOG_VERSION_NO 202511071
#endif

6
src/include/catalog/pg_proc.dat
View File

@@ -5704,9 +5704,9 @@
{ oid => '6231', descr => 'statistics: information about subscription stats',
proname => 'pg_stat_get_subscription_stats', provolatile => 's',
proparallel => 'r', prorettype => 'record', proargtypes => 'oid',
proallargtypes => '{oid,oid,int8,int8,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o}',
proargnames => '{subid,subid,apply_error_count,sync_error_count,confl_insert_exists,confl_update_origin_differs,confl_update_exists,confl_update_deleted,confl_update_missing,confl_delete_origin_differs,confl_delete_missing,confl_multiple_unique_conflicts,stats_reset}',
proallargtypes => '{oid,oid,int8,int8,int8,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o}',
proargnames => '{subid,subid,apply_error_count,seq_sync_error_count,sync_error_count,confl_insert_exists,confl_update_origin_differs,confl_update_exists,confl_update_deleted,confl_update_missing,confl_delete_origin_differs,confl_delete_missing,confl_multiple_unique_conflicts,stats_reset}',
prosrc => 'pg_stat_get_subscription_stats' },
{ oid => '6118', descr => 'statistics: information about subscription',
proname => 'pg_stat_get_subscription', prorows => '10', proisstrict => 'f',

6
src/include/pgstat.h
View File

@@ -16,6 +16,7 @@
#include "portability/instr_time.h"
#include "postmaster/pgarch.h" /* for MAX_XFN_CHARS */
#include "replication/conflict.h"
#include "replication/worker_internal.h"
#include "utils/backend_progress.h" /* for backward compatibility */ /* IWYU pragma: export */
#include "utils/backend_status.h" /* for backward compatibility */ /* IWYU pragma: export */
#include "utils/pgstat_kind.h"
@@ -108,6 +109,7 @@ typedef struct PgStat_FunctionCallUsage
typedef struct PgStat_BackendSubEntry
{
PgStat_Counter apply_error_count;
PgStat_Counter seq_sync_error_count;
PgStat_Counter sync_error_count;
PgStat_Counter conflict_count[CONFLICT_NUM_TYPES];
} PgStat_BackendSubEntry;
@@ -416,6 +418,7 @@ typedef struct PgStat_SLRUStats
typedef struct PgStat_StatSubEntry
{
PgStat_Counter apply_error_count;
PgStat_Counter seq_sync_error_count;
PgStat_Counter sync_error_count;
PgStat_Counter conflict_count[CONFLICT_NUM_TYPES];
TimestampTz stat_reset_timestamp;
@@ -769,7 +772,8 @@ extern PgStat_SLRUStats *pgstat_fetch_slru(void);
* Functions in pgstat_subscription.c
*/
extern void pgstat_report_subscription_error(Oid subid, bool is_apply_error);
extern void pgstat_report_subscription_error(Oid subid,
LogicalRepWorkerType wtype);
extern void pgstat_report_subscription_conflict(Oid subid, ConflictType type);
extern void pgstat_create_subscription(Oid subid);
extern void pgstat_drop_subscription(Oid subid);