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Add views and functions to monitor hot standby query conflicts

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Add the view pg_stat_database_conflicts and a column to pg_stat_database,
and the underlying functions to provide the information.
This commit is contained in:
Magnus Hagander
2011-01-03 12:46:03 +01:00
parent 1996b48285
commit 40d9e94bd7
9 changed files with 287 additions and 5 deletions
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69
src/backend/postmaster/pgstat.c
View File

@@ -57,6 +57,7 @@
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
#include "storage/procsignal.h"
#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
@@ -278,6 +279,7 @@ static void pgstat_recv_analyze(PgStat_MsgAnalyze *msg, int len);
static void pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len);
static void pgstat_recv_funcstat(PgStat_MsgFuncstat *msg, int len);
static void pgstat_recv_funcpurge(PgStat_MsgFuncpurge *msg, int len);
static void pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len);
/* ------------------------------------------------------------
@@ -1314,6 +1316,25 @@ pgstat_report_analyze(Relation rel, bool adopt_counts,
pgstat_send(&msg, sizeof(msg));
}
/* --------
* pgstat_report_recovery_conflict() -
*
* Tell the collector about a Hot Standby recovery conflict.
* --------
*/
void
pgstat_report_recovery_conflict(int reason)
{
PgStat_MsgRecoveryConflict msg;
if (pgStatSock == PGINVALID_SOCKET || !pgstat_track_counts)
return;
pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RECOVERYCONFLICT);
msg.m_databaseid = MyDatabaseId;
msg.m_reason = reason;
pgstat_send(&msg, sizeof(msg));
}
/* ----------
* pgstat_ping() -
@@ -3053,6 +3074,10 @@ PgstatCollectorMain(int argc, char *argv[])
pgstat_recv_funcpurge((PgStat_MsgFuncpurge *) &msg, len);
break;
case PGSTAT_MTYPE_RECOVERYCONFLICT:
pgstat_recv_recoveryconflict((PgStat_MsgRecoveryConflict *) &msg, len);
break;
default:
break;
}
@@ -3129,6 +3154,11 @@ pgstat_get_db_entry(Oid databaseid, bool create)
result->n_tuples_updated = 0;
result->n_tuples_deleted = 0;
result->last_autovac_time = 0;
result->n_conflict_tablespace = 0;
result->n_conflict_lock = 0;
result->n_conflict_snapshot = 0;
result->n_conflict_bufferpin = 0;
result->n_conflict_startup_deadlock = 0;
memset(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
@@ -4203,6 +4233,45 @@ pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len)
globalStats.buf_alloc += msg->m_buf_alloc;
}
/* ----------
* pgstat_recv_recoveryconflict() -
*
* Process as RECOVERYCONFLICT message.
* ----------
*/
static void
pgstat_recv_recoveryconflict(PgStat_MsgRecoveryConflict *msg, int len)
{
PgStat_StatDBEntry *dbentry;
dbentry = pgstat_get_db_entry(msg->m_databaseid, true);
switch (msg->m_reason)
{
case PROCSIG_RECOVERY_CONFLICT_DATABASE:
/*
* Since we drop the information about the database as soon
* as it replicates, there is no point in counting these
* conflicts.
*/
break;
case PROCSIG_RECOVERY_CONFLICT_TABLESPACE:
dbentry->n_conflict_tablespace++;
break;
case PROCSIG_RECOVERY_CONFLICT_LOCK:
dbentry->n_conflict_lock++;
break;
case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT:
dbentry->n_conflict_snapshot++;
break;
case PROCSIG_RECOVERY_CONFLICT_BUFFERPIN:
dbentry->n_conflict_bufferpin++;
break;
case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK:
dbentry->n_conflict_startup_deadlock++;
break;
}
}
/* ----------
* pgstat_recv_funcstat() -
*