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Add slotsync skip statistics.

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This patch adds two new columns to the pg_stat_replication_slots view:
slotsync_skip_count - the total number of times a slotsync operation was
skipped.
slotsync_skip_at - the timestamp of the most recent skip.

These additions provide better visibility into replication slot
synchronization behavior.

A future patch will introduce the slotsync_skip_reason column in
pg_replication_slots to capture the reason for skip.

Author: Shlok Kyal <shlok.kyal.oss@gmail.com>
Reviewed-by: shveta malik <shveta.malik@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Ashutosh Sharma <ashu.coek88@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CAE9k0PkhfKrTEAsGz4DjOhEj1nQ+hbQVfvWUxNacD38ibW3a1g@mail.gmail.com
This commit is contained in:
Amit Kapila
2025-11-25 06:47:49 +00:00
parent c581c9a7ac
commit 76b78721ca
11 changed files with 212 additions and 42 deletions
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2
src/include/catalog/catversion.h
View File

@@ -57,6 +57,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 202511221
#define CATALOG_VERSION_NO 202511251
#endif

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

@@ -5691,9 +5691,9 @@
{ oid => '6169', descr => 'statistics: information about replication slot',
proname => 'pg_stat_get_replication_slot', provolatile => 's',
proparallel => 'r', prorettype => 'record', proargtypes => 'text',
proallargtypes => '{text,text,int8,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o}',
proargnames => '{slot_name,slot_name,spill_txns,spill_count,spill_bytes,stream_txns,stream_count,stream_bytes,mem_exceeded_count,total_txns,total_bytes,stats_reset}',
proallargtypes => '{text,text,int8,int8,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz,timestamptz}',
proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o}',
proargnames => '{slot_name,slot_name,spill_txns,spill_count,spill_bytes,stream_txns,stream_count,stream_bytes,mem_exceeded_count,total_txns,total_bytes,slotsync_skip_count,slotsync_skip_at,stats_reset}',
prosrc => 'pg_stat_get_replication_slot' },
{ oid => '6230', descr => 'statistics: check if a stats object exists',

5
src/include/pgstat.h
View File

@@ -214,7 +214,7 @@ typedef struct PgStat_TableXactStatus
* ------------------------------------------------------------
*/
#define PGSTAT_FILE_FORMAT_ID 0x01A5BCBA
#define PGSTAT_FILE_FORMAT_ID 0x01A5BCBB
typedef struct PgStat_ArchiverStats
{
@@ -400,6 +400,8 @@ typedef struct PgStat_StatReplSlotEntry
PgStat_Counter mem_exceeded_count;
PgStat_Counter total_txns;
PgStat_Counter total_bytes;
PgStat_Counter slotsync_skip_count;
TimestampTz slotsync_skip_at;
TimestampTz stat_reset_timestamp;
} PgStat_StatReplSlotEntry;
@@ -745,6 +747,7 @@ extern PgStat_TableStatus *find_tabstat_entry(Oid rel_id);
extern void pgstat_reset_replslot(const char *name);
struct ReplicationSlot;
extern void pgstat_report_replslot(struct ReplicationSlot *slot, const PgStat_StatReplSlotEntry *repSlotStat);
extern void pgstat_report_replslotsync(struct ReplicationSlot *slot);
extern void pgstat_create_replslot(struct ReplicationSlot *slot);
extern void pgstat_acquire_replslot(struct ReplicationSlot *slot);
extern void pgstat_drop_replslot(struct ReplicationSlot *slot);