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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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80
src/backend/utils/adt/pgstatfuncs.c
View File

@ -2069,6 +2069,20 @@ pg_stat_reset_slru(PG_FUNCTION_ARGS)
PG_RETURN_VOID();
}
/* Reset replication slots stats (a specific one or all of them). */
Datum
pg_stat_reset_replication_slot(PG_FUNCTION_ARGS)
{
char *target = NULL;
if (!PG_ARGISNULL(0))
target = text_to_cstring(PG_GETARG_TEXT_PP(0));
pgstat_reset_replslot_counter(target);
PG_RETURN_VOID();
}
Datum
pg_stat_get_archiver(PG_FUNCTION_ARGS)
{
@ -2134,3 +2148,69 @@ pg_stat_get_archiver(PG_FUNCTION_ARGS)
/* Returns the record as Datum */
PG_RETURN_DATUM(HeapTupleGetDatum(heap_form_tuple(tupdesc, values, nulls)));
}
/* Get the statistics for the replication slots */
Datum
pg_stat_get_replication_slots(PG_FUNCTION_ARGS)
{
#define PG_STAT_GET_REPLICATION_SLOT_CLOS 5
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
TupleDesc tupdesc;
Tuplestorestate *tupstore;
MemoryContext per_query_ctx;
MemoryContext oldcontext;
PgStat_ReplSlotStats *slotstats;
int nstats;
int i;
/* check to see if caller supports us returning a tuplestore */
if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("set-valued function called in context that cannot accept a set")));
if (!(rsinfo->allowedModes & SFRM_Materialize))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("materialize mode required, but it is not allowed in this context")));
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
oldcontext = MemoryContextSwitchTo(per_query_ctx);
tupstore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->returnMode = SFRM_Materialize;
rsinfo->setResult = tupstore;
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
slotstats = pgstat_fetch_replslot(&nstats);
for (i = 0; i < nstats; i++)
{
Datum values[PG_STAT_GET_REPLICATION_SLOT_CLOS];
bool nulls[PG_STAT_GET_REPLICATION_SLOT_CLOS];
PgStat_ReplSlotStats *s = &(slotstats[i]);
MemSet(values, 0, sizeof(values));
MemSet(nulls, 0, sizeof(nulls));
values[0] = PointerGetDatum(cstring_to_text(s->slotname));
values[1] = Int64GetDatum(s->spill_txns);
values[2] = Int64GetDatum(s->spill_count);
values[3] = Int64GetDatum(s->spill_bytes);
if (s->stat_reset_timestamp == 0)
nulls[4] = true;
else
values[4] = TimestampTzGetDatum(s->stat_reset_timestamp);
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
}
tuplestore_donestoring(tupstore);
return (Datum) 0;
}