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Unify VACUUM VERBOSE and autovacuum logging.

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The log_autovacuum_min_duration instrumentation used its own dedicated
code for logging, which was not reused by VACUUM VERBOSE.  This was
highly duplicative, and sometimes led to each code path using slightly
different accounting for essentially the same information.

Clean things up by making VACUUM VERBOSE reuse the same instrumentation
code.  This code restructuring changes the structure of the VACUUM
VERBOSE output itself, but that seems like an overall improvement.  The
most noticeable change in VACUUM VERBOSE output is that it no longer
outputs a distinct message per index per round of index vacuuming.  Most
of the same information (about each index) is now shown in its new
per-operation summary message.  This is far more legible.

A few details are no longer displayed by VACUUM VERBOSE, but that's no
real loss in practice, especially in the common case where we don't need
multiple index scans/rounds of vacuuming.  This super fine-grained
information is still available via DEBUG2 messages, which might still be
useful in debugging scenarios.

VACUUM VERBOSE now shows new instrumentation, which is typically very
useful: all of the log_autovacuum_min_duration instrumentation that it
missed out on before now.  This includes information about WAL overhead,
buffers hit/missed/dirtied information, and I/O timing information.

VACUUM VERBOSE still retains a few INFO messages of its own.  This is
limited to output concerning the progress of heap rel truncation, as
well as some basic information about parallel workers.  These details
are still potentially quite useful.  They aren't a good fit for the log
output, which must summarize the whole operation.

Author: Peter Geoghegan <pg@bowt.ie>
Reviewed-By: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-By: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CAH2-WzmW4Me7_qR4X4ka7pxP-jGmn7=Npma_-Z-9Y1eD0MQRLw@mail.gmail.com
pull/73/head
Peter Geoghegan 4 years ago
parent 0c53a6658e
commit 49c9d9fcfa
5 changed files with 93 additions and 170 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 10
      doc/src/sgml/config.sgml
  2. 221
      src/backend/access/heap/vacuumlazy.c
  3. 21
      src/backend/commands/vacuum.c
  4. 5
      src/backend/commands/vacuumparallel.c
  5. 6
      src/include/commands/vacuum.h

10
doc/src/sgml/config.sgml
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@ -7614,10 +7614,12 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
displayed in <link linkend="monitoring-pg-stat-database-view">
<structname>pg_stat_database</structname></link>, in the output of
<xref linkend="sql-explain"/> when the <literal>BUFFERS</literal> option
is used, by autovacuum for auto-vacuums and auto-analyzes, when
<xref linkend="guc-log-autovacuum-min-duration"/> is set and by
<xref linkend="pgstatstatements"/>. Only superusers can change this
setting.
is used, in the output of <xref linkend="sql-vacuum"/> when
the <literal>VERBOSE</literal> option is used, by autovacuum
for auto-vacuums and auto-analyzes, when <xref
linkend="guc-log-autovacuum-min-duration"/> is set and by
<xref linkend="pgstatstatements"/>. Only superusers can
change this setting.
</para>
</listitem>
</varlistentry>

221
src/backend/access/heap/vacuumlazy.c
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@ -171,10 +171,11 @@ typedef struct LVRelState
/* Error reporting state */
char *relnamespace;
char *relname;
char *indname;
char *indname; /* Current index name */
BlockNumber blkno; /* used only for heap operations */
OffsetNumber offnum; /* used only for heap operations */
VacErrPhase phase;
bool verbose; /* VACUUM VERBOSE? */
/*
* State managed by lazy_scan_heap() follows.
@ -237,9 +238,6 @@ typedef struct LVSavedErrInfo
VacErrPhase phase;
} LVSavedErrInfo;
/* elevel controls whole VACUUM's verbosity */
static int elevel = -1;
/* non-export function prototypes */
static void lazy_scan_heap(LVRelState *vacrel, VacuumParams *params,
@ -299,6 +297,8 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
BufferAccessStrategy bstrategy)
{
LVRelState *vacrel;
bool verbose,
instrument;
PGRUsage ru0;
TimestampTz starttime = 0;
WalUsage walusage_start = pgWalUsage;
@ -324,8 +324,10 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
TransactionId FreezeLimit;
MultiXactId MultiXactCutoff;
/* measure elapsed time iff autovacuum logging requires it */
if (IsAutoVacuumWorkerProcess() && params->log_min_duration >= 0)
verbose = (params->options & VACOPT_VERBOSE) != 0;
instrument = (verbose || (IsAutoVacuumWorkerProcess() &&
params->log_min_duration >= 0));
if (instrument)
{
pg_rusage_init(&ru0);
starttime = GetCurrentTimestamp();
@ -336,11 +338,6 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
}
}
if (params->options & VACOPT_VERBOSE)
elevel = INFO;
else
elevel = DEBUG2;
pgstat_progress_start_command(PROGRESS_COMMAND_VACUUM,
RelationGetRelid(rel));
@ -365,14 +362,54 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
if (params->options & VACOPT_DISABLE_PAGE_SKIPPING)
aggressive = true;
/*
* Setup error traceback support for ereport() first. The idea is to set
* up an error context callback to display additional information on any
* error during a vacuum. During different phases of vacuum, we update
* the state so that the error context callback always display current
* information.
*
* Copy the names of heap rel into local memory for error reporting
* purposes, too. It isn't always safe to assume that we can get the name
* of each rel. It's convenient for code in lazy_scan_heap to always use
* these temp copies.
*/
vacrel = (LVRelState *) palloc0(sizeof(LVRelState));
vacrel->relnamespace = get_namespace_name(RelationGetNamespace(rel));
vacrel->relname = pstrdup(RelationGetRelationName(rel));
vacrel->indname = NULL;
vacrel->phase = VACUUM_ERRCB_PHASE_UNKNOWN;
vacrel->verbose = verbose;
errcallback.callback = vacuum_error_callback;
errcallback.arg = vacrel;
errcallback.previous = error_context_stack;
error_context_stack = &errcallback;
if (verbose)
{
Assert(!IsAutoVacuumWorkerProcess());
if (aggressive)
ereport(INFO,
(errmsg("aggressively vacuuming \"%s.%s.%s\"",
get_database_name(MyDatabaseId),
vacrel->relnamespace, vacrel->relname)));
else
ereport(INFO,
(errmsg("vacuuming \"%s.%s.%s\"",
get_database_name(MyDatabaseId),
vacrel->relnamespace, vacrel->relname)));
}
/* Set up high level stuff about rel */
/* Set up high level stuff about rel and its indexes */
vacrel->rel = rel;
vac_open_indexes(vacrel->rel, RowExclusiveLock, &vacrel->nindexes,
&vacrel->indrels);
vacrel->failsafe_active = false;
vacrel->consider_bypass_optimization = true;
if (instrument && vacrel->nindexes > 0)
{
/* Copy index names used by instrumentation (not error reporting) */
indnames = palloc(sizeof(char *) * vacrel->nindexes);
for (int i = 0; i < vacrel->nindexes; i++)
indnames[i] = pstrdup(RelationGetRelationName(vacrel->indrels[i]));
}
/*
* The index_cleanup param either disables index vacuuming and cleanup or
@ -386,6 +423,8 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
Assert(params->index_cleanup != VACOPTVALUE_UNSPECIFIED);
Assert(params->truncate != VACOPTVALUE_UNSPECIFIED &&
params->truncate != VACOPTVALUE_AUTO);
vacrel->failsafe_active = false;
vacrel->consider_bypass_optimization = true;
vacrel->do_index_vacuuming = true;
vacrel->do_index_cleanup = true;
vacrel->do_rel_truncate = (params->truncate != VACOPTVALUE_DISABLED);
@ -416,37 +455,6 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
vacrel->FreezeLimit = FreezeLimit;
vacrel->MultiXactCutoff = MultiXactCutoff;
vacrel->relnamespace = get_namespace_name(RelationGetNamespace(rel));
vacrel->relname = pstrdup(RelationGetRelationName(rel));
vacrel->indname = NULL;
vacrel->phase = VACUUM_ERRCB_PHASE_UNKNOWN;
/* Save index names iff autovacuum logging requires it */
if (IsAutoVacuumWorkerProcess() && params->log_min_duration >= 0 &&
vacrel->nindexes > 0)
{
indnames = palloc(sizeof(char *) * vacrel->nindexes);
for (int i = 0; i < vacrel->nindexes; i++)
indnames[i] =
pstrdup(RelationGetRelationName(vacrel->indrels[i]));
}
/*
* Setup error traceback support for ereport(). The idea is to set up an
* error context callback to display additional information on any error
* during a vacuum. During different phases of vacuum (heap scan, heap
* vacuum, index vacuum, index clean up, heap truncate), we update the
* error context callback to display appropriate information.
*
* Note that the index vacuum and heap vacuum phases may be called
* multiple times in the middle of the heap scan phase. So the old phase
* information is restored at the end of those phases.
*/
errcallback.callback = vacuum_error_callback;
errcallback.arg = vacrel;
errcallback.previous = error_context_stack;
error_context_stack = &errcallback;
/*
* Call lazy_scan_heap to perform all required heap pruning, index
* vacuuming, and heap vacuuming (plus related processing)
@ -477,11 +485,6 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
*/
if (should_attempt_truncation(vacrel))
{
/*
* Update error traceback information. This is the last phase during
* which we add context information to errors, so we don't need to
* revert to the previous phase.
*/
update_vacuum_error_info(vacrel, NULL, VACUUM_ERRCB_PHASE_TRUNCATE,
vacrel->nonempty_pages,
InvalidOffsetNumber);
@ -544,12 +547,11 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
vacrel->new_dead_tuples);
pgstat_progress_end_command();
/* and log the action if appropriate */
if (IsAutoVacuumWorkerProcess() && params->log_min_duration >= 0)
if (instrument)
{
TimestampTz endtime = GetCurrentTimestamp();
if (params->log_min_duration == 0 ||
if (verbose || params->log_min_duration == 0 ||
TimestampDifferenceExceeds(starttime, endtime,
params->log_min_duration))
{
@ -572,12 +574,17 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
(secs + usecs / 1000000.0);
}
/*
* This is pretty messy, but we split it up so that we can skip
* emitting individual parts of the message when not applicable.
*/
initStringInfo(&buf);
if (params->is_wraparound)
if (verbose)
{
/*
* Aggressiveness already reported earlier, in dedicated
* VACUUM VERBOSE ereport
*/
Assert(!params->is_wraparound);
msgfmt = _("finished vacuuming \"%s.%s.%s\": index scans: %d\n");
}
else if (params->is_wraparound)
{
/*
* While it's possible for a VACUUM to be both is_wraparound
@ -676,7 +683,7 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
(unsigned long long) walusage.wal_bytes);
appendStringInfo(&buf, _("system usage: %s"), pg_rusage_show(&ru0));
ereport(LOG,
ereport(verbose ? INFO : LOG,
(errmsg_internal("%s", buf.data)));
pfree(buf.data);
}
@ -688,7 +695,7 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
if (vacrel->indstats[i])
pfree(vacrel->indstats[i]);
if (indnames && indnames[i])
if (instrument)
pfree(indnames[i]);
}
}
@ -738,10 +745,8 @@ lazy_scan_heap(LVRelState *vacrel, VacuumParams *params, bool aggressive)
next_unskippable_block,
next_failsafe_block,
next_fsm_block_to_vacuum;
PGRUsage ru0;
Buffer vmbuffer = InvalidBuffer;
bool skipping_blocks;
StringInfoData buf;
const int initprog_index[] = {
PROGRESS_VACUUM_PHASE,
PROGRESS_VACUUM_TOTAL_HEAP_BLKS,
@ -750,19 +755,6 @@ lazy_scan_heap(LVRelState *vacrel, VacuumParams *params, bool aggressive)
int64 initprog_val[3];
GlobalVisState *vistest;
pg_rusage_init(&ru0);
if (aggressive)
ereport(elevel,
(errmsg("aggressively vacuuming \"%s.%s\"",
vacrel->relnamespace,
vacrel->relname)));
else
ereport(elevel,
(errmsg("vacuuming \"%s.%s\"",
vacrel->relnamespace,
vacrel->relname)));
nblocks = RelationGetNumberOfBlocks(vacrel->rel);
next_unskippable_block = 0;
next_failsafe_block = 0;
@ -1453,52 +1445,6 @@ lazy_scan_heap(LVRelState *vacrel, VacuumParams *params, bool aggressive)
/* Update index statistics */
if (vacrel->nindexes > 0 && vacrel->do_index_cleanup)
update_index_statistics(vacrel);
/*
* When the table has no indexes (i.e. in the one-pass strategy case),
* make log report that lazy_vacuum_heap_rel would've made had there been
* indexes. (As in the two-pass strategy case, only make this report when
* there were LP_DEAD line pointers vacuumed in lazy_vacuum_heap_page.)
*/
if (vacrel->nindexes == 0 && vacrel->lpdead_item_pages > 0)
ereport(elevel,
(errmsg("table \"%s\": removed %lld dead item identifiers in %u pages",
vacrel->relname, (long long) vacrel->lpdead_items,
vacrel->lpdead_item_pages)));
/*
* Make a log report summarizing pruning and freezing.
*
* The autovacuum specific logging in heap_vacuum_rel summarizes an entire
* VACUUM operation, whereas each VACUUM VERBOSE log report generally
* summarizes a single round of index/heap vacuuming (or rel truncation).
* It wouldn't make sense to report on pruning or freezing while following
* that convention, though. You can think of this log report as a summary
* of our first pass over the heap.
*/
initStringInfo(&buf);
appendStringInfo(&buf,
_("%lld dead row versions cannot be removed yet, oldest xmin: %u\n"),
(long long) vacrel->new_dead_tuples, vacrel->OldestXmin);
appendStringInfo(&buf, ngettext("Skipped %u page due to buffer pins, ",
"Skipped %u pages due to buffer pins, ",
vacrel->pinskipped_pages),
vacrel->pinskipped_pages);
appendStringInfo(&buf, ngettext("%u frozen page.\n",
"%u frozen pages.\n",
vacrel->frozenskipped_pages),
vacrel->frozenskipped_pages);
appendStringInfo(&buf, _("%s."), pg_rusage_show(&ru0));
ereport(elevel,
(errmsg("table \"%s.%s\": found %lld removable, %lld nonremovable row versions in %u out of %u pages",
vacrel->relnamespace,
vacrel->relname,
(long long) vacrel->tuples_deleted,
(long long) vacrel->num_tuples, vacrel->scanned_pages,
nblocks),
errdetail_internal("%s", buf.data)));
pfree(buf.data);
}
/*
@ -1995,11 +1941,6 @@ lazy_vacuum(LVRelState *vacrel)
* calls.)
*/
vacrel->do_index_vacuuming = false;
ereport(elevel,
(errmsg("table \"%s\": index scan bypassed: %u pages from table (%.2f%% of total) have %lld dead item identifiers",
vacrel->relname, vacrel->lpdead_item_pages,
100.0 * vacrel->lpdead_item_pages / vacrel->rel_pages,
(long long) vacrel->lpdead_items)));
}
else if (lazy_vacuum_all_indexes(vacrel))
{
@ -2142,7 +2083,6 @@ lazy_vacuum_heap_rel(LVRelState *vacrel)
{
int index;
BlockNumber vacuumed_pages;
PGRUsage ru0;
Buffer vmbuffer = InvalidBuffer;
LVSavedErrInfo saved_err_info;
@ -2159,7 +2099,6 @@ lazy_vacuum_heap_rel(LVRelState *vacrel)
VACUUM_ERRCB_PHASE_VACUUM_HEAP,
InvalidBlockNumber, InvalidOffsetNumber);
pg_rusage_init(&ru0);
vacuumed_pages = 0;
index = 0;
@ -2206,10 +2145,9 @@ lazy_vacuum_heap_rel(LVRelState *vacrel)
(index == vacrel->lpdead_items &&
vacuumed_pages == vacrel->lpdead_item_pages));
ereport(elevel,
ereport(DEBUG2,
(errmsg("table \"%s\": removed %lld dead item identifiers in %u pages",
vacrel->relname, (long long) index, vacuumed_pages),
errdetail_internal("%s", pg_rusage_show(&ru0))));
vacrel->relname, (long long) index, vacuumed_pages)));
/* Revert to the previous phase information for error traceback */
restore_vacuum_error_info(vacrel, &saved_err_info);
@ -2519,7 +2457,7 @@ lazy_vacuum_one_index(Relation indrel, IndexBulkDeleteResult *istat,
ivinfo.analyze_only = false;
ivinfo.report_progress = false;
ivinfo.estimated_count = true;
ivinfo.message_level = elevel;
ivinfo.message_level = DEBUG2;
ivinfo.num_heap_tuples = reltuples;
ivinfo.strategy = vacrel->bstrategy;
@ -2567,7 +2505,7 @@ lazy_cleanup_one_index(Relation indrel, IndexBulkDeleteResult *istat,
ivinfo.analyze_only = false;
ivinfo.report_progress = false;
ivinfo.estimated_count = estimated_count;
ivinfo.message_level = elevel;
ivinfo.message_level = DEBUG2;
ivinfo.num_heap_tuples = reltuples;
ivinfo.strategy = vacrel->bstrategy;
@ -2653,10 +2591,6 @@ lazy_truncate_heap(LVRelState *vacrel)
*/
do
{
PGRUsage ru0;
pg_rusage_init(&ru0);
/*
* We need full exclusive lock on the relation in order to do
* truncation. If we can't get it, give up rather than waiting --- we
@ -2684,7 +2618,7 @@ lazy_truncate_heap(LVRelState *vacrel)
* We failed to establish the lock in the specified number of
* retries. This means we give up truncating.
*/
ereport(elevel,
ereport(vacrel->verbose ? INFO : DEBUG2,
(errmsg("\"%s\": stopping truncate due to conflicting lock request",
vacrel->relname)));
return;
@ -2754,12 +2688,10 @@ lazy_truncate_heap(LVRelState *vacrel)
vacrel->pages_removed += orig_rel_pages - new_rel_pages;
vacrel->rel_pages = new_rel_pages;
ereport(elevel,
ereport(vacrel->verbose ? INFO : DEBUG2,
(errmsg("table \"%s\": truncated %u to %u pages",
vacrel->relname,
orig_rel_pages, new_rel_pages),
errdetail_internal("%s",
pg_rusage_show(&ru0))));
orig_rel_pages, new_rel_pages)));
orig_rel_pages = new_rel_pages;
} while (new_rel_pages > vacrel->nonempty_pages && lock_waiter_detected);
}
@ -2818,7 +2750,7 @@ count_nondeletable_pages(LVRelState *vacrel, bool *lock_waiter_detected)
{
if (LockHasWaitersRelation(vacrel->rel, AccessExclusiveLock))
{
ereport(elevel,
ereport(vacrel->verbose ? INFO : DEBUG2,
(errmsg("table \"%s\": suspending truncate due to conflicting lock request",
vacrel->relname)));
@ -2985,7 +2917,8 @@ dead_items_alloc(LVRelState *vacrel, int nworkers)
else
vacrel->pvs = parallel_vacuum_init(vacrel->rel, vacrel->indrels,
vacrel->nindexes, nworkers,
max_items, elevel,
max_items,
vacrel->verbose ? INFO : DEBUG2,
vacrel->bstrategy);
/* If parallel mode started, dead_items space is allocated in DSM */

21
src/backend/commands/vacuum.c
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@ -268,7 +268,7 @@ ExecVacuum(ParseState *pstate, VacuumStmt *vacstmt, bool isTopLevel)
/* user-invoked vacuum is never "for wraparound" */
params.is_wraparound = false;
/* user-invoked vacuum never uses this parameter */
/* user-invoked vacuum uses VACOPT_VERBOSE instead of log_min_duration */
params.log_min_duration = -1;
/* Now go through the common routine */
@ -2275,10 +2275,6 @@ IndexBulkDeleteResult *
vac_bulkdel_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat,
VacDeadItems *dead_items)
{
PGRUsage ru0;
pg_rusage_init(&ru0);
/* Do bulk deletion */
istat = index_bulk_delete(ivinfo, istat, vac_tid_reaped,
(void *) dead_items);
@ -2286,8 +2282,7 @@ vac_bulkdel_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat,
ereport(ivinfo->message_level,
(errmsg("scanned index \"%s\" to remove %d row versions",
RelationGetRelationName(ivinfo->index),
dead_items->num_items),
errdetail_internal("%s", pg_rusage_show(&ru0))));
dead_items->num_items)));
return istat;
}
@ -2300,14 +2295,9 @@ vac_bulkdel_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat,
IndexBulkDeleteResult *
vac_cleanup_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat)
{
PGRUsage ru0;
pg_rusage_init(&ru0);
istat = index_vacuum_cleanup(ivinfo, istat);
if (istat)
{
ereport(ivinfo->message_level,
(errmsg("index \"%s\" now contains %.0f row versions in %u pages",
RelationGetRelationName(ivinfo->index),
@ -2315,13 +2305,10 @@ vac_cleanup_one_index(IndexVacuumInfo *ivinfo, IndexBulkDeleteResult *istat)
istat->num_pages),
errdetail("%.0f index row versions were removed.\n"
"%u index pages were newly deleted.\n"
"%u index pages are currently deleted, of which %u are currently reusable.\n"
"%s.",
"%u index pages are currently deleted, of which %u are currently reusable.",
istat->tuples_removed,
istat->pages_newly_deleted,
istat->pages_deleted, istat->pages_free,
pg_rusage_show(&ru0))));
}
istat->pages_deleted, istat->pages_free)));
return istat;
}

5
src/backend/commands/vacuumparallel.c
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@ -55,7 +55,8 @@
typedef struct PVShared
{
/*
* Target table relid and log level. These fields are not modified during
* Target table relid and log level (for messages about parallel workers
* launched during VACUUM VERBOSE). These fields are not modified during
* the parallel vacuum.
*/
Oid relid;
@ -830,7 +831,7 @@ parallel_vacuum_process_one_index(ParallelVacuumState *pvs, Relation indrel,
ivinfo.index = indrel;
ivinfo.analyze_only = false;
ivinfo.report_progress = false;
ivinfo.message_level = pvs->shared->elevel;
ivinfo.message_level = DEBUG2;
ivinfo.estimated_count = pvs->shared->estimated_count;
ivinfo.num_heap_tuples = pvs->shared->reltuples;
ivinfo.strategy = pvs->bstrategy;

6
src/include/commands/vacuum.h
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@ -182,7 +182,7 @@ typedef struct VacAttrStats
/* flag bits for VacuumParams->options */
#define VACOPT_VACUUM 0x01 /* do VACUUM */
#define VACOPT_ANALYZE 0x02 /* do ANALYZE */
#define VACOPT_VERBOSE 0x04 /* print progress info */
#define VACOPT_VERBOSE 0x04 /* output INFO instrumentation messages */
#define VACOPT_FREEZE 0x08 /* FREEZE option */
#define VACOPT_FULL 0x10 /* FULL (non-concurrent) vacuum */
#define VACOPT_SKIP_LOCKED 0x20 /* skip if cannot get lock */
@ -222,8 +222,8 @@ typedef struct VacuumParams
* whole table */
bool is_wraparound; /* force a for-wraparound vacuum */
int log_min_duration; /* minimum execution threshold in ms at
* which verbose logs are activated, -1
* to use default */
* which autovacuum is logged, -1 to use
* default */
VacOptValue index_cleanup; /* Do index vacuum and cleanup */
VacOptValue truncate; /* Truncate empty pages at the end */

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