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Track statistics for spilling of changes from ReorderBuffer.

Browse Source 
This adds the statistics about transactions spilled to disk from
ReorderBuffer. Users can query the pg_stat_replication_slots view to check
these stats and call pg_stat_reset_replication_slot to reset the stats of
a particular slot. Users can pass NULL in pg_stat_reset_replication_slot
to reset stats of all the slots.

This commit extends the statistics collector to track this information
about slots.

Author: Sawada Masahiko and Amit Kapila
Reviewed-by: Amit Kapila and Dilip Kumar
Discussion: https://postgr.es/m/CA+fd4k5_pPAYRTDrO2PbtTOe0eHQpBvuqmCr8ic39uTNmR49Eg@mail.gmail.com
This commit is contained in:
Amit Kapila
2020-10-08 09:09:08 +05:30
parent 8d2a01ae12
commit 9868167500
16 changed files with 700 additions and 8 deletions
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52
src/include/pgstat.h
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@ -56,6 +56,7 @@ typedef enum StatMsgType
PGSTAT_MTYPE_RESETSHAREDCOUNTER,
PGSTAT_MTYPE_RESETSINGLECOUNTER,
PGSTAT_MTYPE_RESETSLRUCOUNTER,
PGSTAT_MTYPE_RESETREPLSLOTCOUNTER,
PGSTAT_MTYPE_AUTOVAC_START,
PGSTAT_MTYPE_VACUUM,
PGSTAT_MTYPE_ANALYZE,
@ -68,7 +69,8 @@ typedef enum StatMsgType
PGSTAT_MTYPE_RECOVERYCONFLICT,
PGSTAT_MTYPE_TEMPFILE,
PGSTAT_MTYPE_DEADLOCK,
PGSTAT_MTYPE_CHECKSUMFAILURE
PGSTAT_MTYPE_CHECKSUMFAILURE,
PGSTAT_MTYPE_REPLSLOT,
} StatMsgType;
/* ----------
@ -358,6 +360,18 @@ typedef struct PgStat_MsgResetslrucounter
int m_index;
} PgStat_MsgResetslrucounter;
/* ----------
* PgStat_MsgResetreplslotcounter Sent by the backend to tell the collector
* to reset replication slot counter(s)
* ----------
*/
typedef struct PgStat_MsgResetreplslotcounter
{
PgStat_MsgHdr m_hdr;
char m_slotname[NAMEDATALEN];
bool clearall;
} PgStat_MsgResetreplslotcounter;
/* ----------
* PgStat_MsgAutovacStart Sent by the autovacuum daemon to signal
* that a database is going to be processed
@ -465,6 +479,22 @@ typedef struct PgStat_MsgSLRU
PgStat_Counter m_truncate;
} PgStat_MsgSLRU;
/* ----------
* PgStat_MsgReplSlot Sent by a backend or a wal sender to update replication
* slot statistics.
* ----------
*/
typedef struct PgStat_MsgReplSlot
{
PgStat_MsgHdr m_hdr;
char m_slotname[NAMEDATALEN];
bool m_drop;
PgStat_Counter m_spill_txns;
PgStat_Counter m_spill_count;
PgStat_Counter m_spill_bytes;
} PgStat_MsgReplSlot;
/* ----------
* PgStat_MsgRecoveryConflict Sent by the backend upon recovery conflict
* ----------
@ -603,6 +633,7 @@ typedef union PgStat_Msg
PgStat_MsgResetsharedcounter msg_resetsharedcounter;
PgStat_MsgResetsinglecounter msg_resetsinglecounter;
PgStat_MsgResetslrucounter msg_resetslrucounter;
PgStat_MsgResetreplslotcounter msg_resetreplslotcounter;
PgStat_MsgAutovacStart msg_autovacuum_start;
PgStat_MsgVacuum msg_vacuum;
PgStat_MsgAnalyze msg_analyze;
@ -616,6 +647,7 @@ typedef union PgStat_Msg
PgStat_MsgDeadlock msg_deadlock;
PgStat_MsgTempFile msg_tempfile;
PgStat_MsgChecksumFailure msg_checksumfailure;
PgStat_MsgReplSlot msg_replslot;
} PgStat_Msg;
@ -627,7 +659,7 @@ typedef union PgStat_Msg
* ------------------------------------------------------------
*/
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9E
#define PGSTAT_FILE_FORMAT_ID 0x01A5BC9F
/* ----------
* PgStat_StatDBEntry The collector's data per database
@ -782,6 +814,17 @@ typedef struct PgStat_SLRUStats
TimestampTz stat_reset_timestamp;
} PgStat_SLRUStats;
/*
* Replication slot statistics kept in the stats collector
*/
typedef struct PgStat_ReplSlotStats
{
char slotname[NAMEDATALEN];
PgStat_Counter spill_txns;
PgStat_Counter spill_count;
PgStat_Counter spill_bytes;
TimestampTz stat_reset_timestamp;
} PgStat_ReplSlotStats;
/* ----------
* Backend states
@ -1330,6 +1373,7 @@ extern void pgstat_reset_counters(void);
extern void pgstat_reset_shared_counters(const char *);
extern void pgstat_reset_single_counter(Oid objectid, PgStat_Single_Reset_Type type);
extern void pgstat_reset_slru_counter(const char *);
extern void pgstat_reset_replslot_counter(const char *name);
extern void pgstat_report_autovac(Oid dboid);
extern void pgstat_report_vacuum(Oid tableoid, bool shared,
@ -1342,6 +1386,9 @@ extern void pgstat_report_recovery_conflict(int reason);
extern void pgstat_report_deadlock(void);
extern void pgstat_report_checksum_failures_in_db(Oid dboid, int failurecount);
extern void pgstat_report_checksum_failure(void);
extern void pgstat_report_replslot(const char *slotname, int spilltxns, int spillcount,
int spillbytes);
extern void pgstat_report_replslot_drop(const char *slotname);
extern void pgstat_initialize(void);
extern void pgstat_bestart(void);
@ -1508,6 +1555,7 @@ extern PgStat_ArchiverStats *pgstat_fetch_stat_archiver(void);
extern PgStat_GlobalStats *pgstat_fetch_global(void);
extern PgStat_WalStats *pgstat_fetch_stat_wal(void);
extern PgStat_SLRUStats *pgstat_fetch_slru(void);
extern PgStat_ReplSlotStats *pgstat_fetch_replslot(int *nslots_p);
extern void pgstat_count_slru_page_zeroed(int slru_idx);
extern void pgstat_count_slru_page_hit(int slru_idx);