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Add new function pg_get_wal_summarizer_state().

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This makes it possible to access information about the progress
of WAL summarization from SQL. The previously-added functions
pg_available_wal_summaries() and pg_wal_summary_contents() only
examine on-disk state, but this function exposes information from
the server's shared memory.

Discussion: http://postgr.es/m/CA+Tgmobvqqj-DW9F7uUzT-cQqs6wcVb-Xhs=w=hzJnXSE-kRGw@mail.gmail.com
This commit is contained in:
Robert Haas
2024-01-11 12:41:18 -05:00
parent 544bcb5a5e
commit d9ef650fca
6 changed files with 146 additions and 1 deletions
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39
src/backend/backup/walsummaryfuncs.c
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@@ -16,11 +16,13 @@
#include "common/blkreftable.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "postmaster/walsummarizer.h"
#include "utils/fmgrprotos.h"
#include "utils/pg_lsn.h"
#define NUM_WS_ATTS 3
#define NUM_SUMMARY_ATTS 6
#define NUM_STATE_ATTS 4
#define MAX_BLOCKS_PER_CALL 256
/*
@@ -167,3 +169,40 @@ pg_wal_summary_contents(PG_FUNCTION_ARGS)
return (Datum) 0;
}
/*
* Returns information about the state of the WAL summarizer process.
*/
Datum
pg_get_wal_summarizer_state(PG_FUNCTION_ARGS)
{
Datum values[NUM_STATE_ATTS];
bool nulls[NUM_STATE_ATTS];
TimeLineID summarized_tli;
XLogRecPtr summarized_lsn;
XLogRecPtr pending_lsn;
int summarizer_pid;
TupleDesc tupdesc;
HeapTuple htup;
GetWalSummarizerState(&summarized_tli, &summarized_lsn, &pending_lsn,
&summarizer_pid);
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
memset(nulls, 0, sizeof(nulls));
values[0] = Int64GetDatum((int64) summarized_tli);
values[1] = LSNGetDatum(summarized_lsn);
values[2] = LSNGetDatum(pending_lsn);
if (summarizer_pid < 0)
nulls[3] = true;
else
values[3] = Int32GetDatum(summarizer_pid);
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}