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Report progress of startup operations that take a long time.

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Users sometimes get concerned whe they start the server and it
emits a few messages and then doesn't emit any more messages for
a long time. Generally, what's happening is either that the
system is taking a long time to apply WAL, or it's taking a
long time to reset unlogged relations, or it's taking a long
time to fsync the data directory, but it's not easy to tell
which is the case.

To fix that, add a new 'log_startup_progress_interval' setting,
by default 10s. When an operation that is known to be potentially
long-running takes more than this amount of time, we'll log a
status update each time this interval elapses.

To avoid undesirable log chatter, don't log anything about WAL
replay when in standby mode.

Nitin Jadhav and Robert Haas, reviewed by Amul Sul, Bharath
Rupireddy, Justin Pryzby, Michael Paquier, and Álvaro Herrera.

Discussion: https://postgr.es/m/CA+TgmoaHQrgDFOBwgY16XCoMtXxsrVGFB2jNCvb7-ubuEe1MGg@mail.gmail.com
Discussion: https://postgr.es/m/CAMm1aWaHF7VE69572_OLQ+MgpT5RUiUDgF1x5RrtkJBLdpRj3Q@mail.gmail.com
This commit is contained in:
Robert Haas
2021-10-25 11:51:57 -04:00
parent 732e6677a6
commit 9ce346eabf
10 changed files with 181 additions and 3 deletions
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14
src/backend/access/transam/xlog.c
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@ -79,6 +79,7 @@
#include "utils/relmapper.h"
#include "utils/pg_rusage.h"
#include "utils/snapmgr.h"
#include "utils/timeout.h"
#include "utils/timestamp.h"
extern uint32 bootstrap_data_checksum_version;
@ -6718,6 +6719,11 @@ StartupXLOG(void)
*/
ValidateXLOGDirectoryStructure();
/* Set up timeout handler needed to report startup progress. */
if (!IsBootstrapProcessingMode())
RegisterTimeout(STARTUP_PROGRESS_TIMEOUT,
startup_progress_timeout_handler);
/*----------
* If we previously crashed, perform a couple of actions:
*
@ -7491,6 +7497,10 @@ StartupXLOG(void)
(errmsg("redo starts at %X/%X",
LSN_FORMAT_ARGS(ReadRecPtr))));
/* Prepare to report progress of the redo phase. */
if (!StandbyMode)
begin_startup_progress_phase();
/*
* main redo apply loop
*/
@ -7498,6 +7508,10 @@ StartupXLOG(void)
{
bool switchedTLI = false;
if (!StandbyMode)
ereport_startup_progress("redo in progress, elapsed time: %ld.%02d s, current LSN: %X/%X",
LSN_FORMAT_ARGS(ReadRecPtr));
#ifdef WAL_DEBUG
if (XLOG_DEBUG ||
(rmid == RM_XACT_ID && trace_recovery_messages <= DEBUG2) ||