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Collect statistics about conflicts in logical replication.

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This commit adds columns in view pg_stat_subscription_stats to show the
number of times a particular conflict type has occurred during the
application of logical replication changes. The following columns are
added:

confl_insert_exists:
        Number of times a row insertion violated a NOT DEFERRABLE unique
        constraint.
confl_update_origin_differs:
        Number of times an update was performed on a row that was
        previously modified by another origin.
confl_update_exists:
        Number of times that the updated value of a row violates a
        NOT DEFERRABLE unique constraint.
confl_update_missing:
        Number of times that the tuple to be updated is missing.
confl_delete_origin_differs:
        Number of times a delete was performed on a row that was
        previously modified by another origin.
confl_delete_missing:
        Number of times that the tuple to be deleted is missing.

The update_origin_differs and delete_origin_differs conflicts can be
detected only when track_commit_timestamp is enabled.

Author: Hou Zhijie
Reviewed-by: Shveta Malik, Peter Smith, Anit Kapila
Discussion: https://postgr.es/m/OS0PR01MB57160A07BD575773045FC214948F2@OS0PR01MB5716.jpnprd01.prod.outlook.com
This commit is contained in:
Amit Kapila
2024-09-04 08:55:21 +05:30
parent 9626068f13
commit 6c2b5edecc
12 changed files with 204 additions and 40 deletions
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17
src/backend/utils/activity/pgstat_subscription.c
View File

@@ -39,6 +39,21 @@ pgstat_report_subscription_error(Oid subid, bool is_apply_error)
pending->sync_error_count++;
}
/*
* Report a subscription conflict.
*/
void
pgstat_report_subscription_conflict(Oid subid, ConflictType type)
{
PgStat_EntryRef *entry_ref;
PgStat_BackendSubEntry *pending;
entry_ref = pgstat_prep_pending_entry(PGSTAT_KIND_SUBSCRIPTION,
InvalidOid, subid, NULL);
pending = entry_ref->pending;
pending->conflict_count[type]++;
}
/*
* Report creating the subscription.
*/
@@ -101,6 +116,8 @@ pgstat_subscription_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)
#define SUB_ACC(fld) shsubent->stats.fld += localent->fld
SUB_ACC(apply_error_count);
SUB_ACC(sync_error_count);
for (int i = 0; i < CONFLICT_NUM_TYPES; i++)
SUB_ACC(conflict_count[i]);
#undef SUB_ACC
pgstat_unlock_entry(entry_ref);