From a5d981a5ecd867bb46f51a8fb1b153d203df03ac Mon Sep 17 00:00:00 2001 From: Justin Pryzby Date: Thu, 12 Dec 2019 20:54:37 -0600 Subject: [PATCH v24 1/4] vacuum errcontext to show block being processed Discussion: https://www.postgresql.org/message-id/20191120210600.GC30362@telsasoft.com --- src/backend/access/heap/vacuumlazy.c | 192 +++++++++++++++++++++++---- 1 file changed, 167 insertions(+), 25 deletions(-) diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c index 03c43efc32..084b43c178 100644 --- a/src/backend/access/heap/vacuumlazy.c +++ b/src/backend/access/heap/vacuumlazy.c @@ -268,8 +268,19 @@ typedef struct LVParallelState int nindexes_parallel_condcleanup; } LVParallelState; +typedef enum { + VACUUM_ERRCB_PHASE_UNKNOWN, + VACUUM_ERRCB_PHASE_SCAN_HEAP, + VACUUM_ERRCB_PHASE_VACUUM_INDEX, + VACUUM_ERRCB_PHASE_VACUUM_HEAP, + VACUUM_ERRCB_PHASE_INDEX_CLEANUP, + VACUUM_ERRCB_PHASE_VACUUM_FSM, +} errcb_phase; + typedef struct LVRelStats { + char *relnamespace; + char *relname; /* useindex = true means two-pass strategy; false means one-pass */ bool useindex; /* Overall statistics about rel */ @@ -290,8 +301,12 @@ typedef struct LVRelStats int num_index_scans; TransactionId latestRemovedXid; bool lock_waiter_detected; -} LVRelStats; + /* Used for error callback: */ + char *indname; + BlockNumber blkno; /* used only for heap operations */ + errcb_phase phase; +} LVRelStats; /* A few variables that don't seem worth passing around as parameters */ static int elevel = -1; @@ -314,10 +329,10 @@ static void lazy_vacuum_all_indexes(Relation onerel, Relation *Irel, LVRelStats *vacrelstats, LVParallelState *lps, int nindexes); static void lazy_vacuum_index(Relation indrel, IndexBulkDeleteResult **stats, - LVDeadTuples *dead_tuples, double reltuples); + LVDeadTuples *dead_tuples, double reltuples, LVRelStats *vacrelstats); static void lazy_cleanup_index(Relation indrel, IndexBulkDeleteResult **stats, - double reltuples, bool estimated_count); + double reltuples, bool estimated_count, LVRelStats *vacrelstats); static int lazy_vacuum_page(Relation onerel, BlockNumber blkno, Buffer buffer, int tupindex, LVRelStats *vacrelstats, Buffer *vmbuffer); static bool should_attempt_truncation(VacuumParams *params, @@ -337,13 +352,13 @@ static void lazy_parallel_vacuum_indexes(Relation *Irel, IndexBulkDeleteResult * int nindexes); static void parallel_vacuum_index(Relation *Irel, IndexBulkDeleteResult **stats, LVShared *lvshared, LVDeadTuples *dead_tuples, - int nindexes); + int nindexes, LVRelStats *vacrelstats); static void vacuum_indexes_leader(Relation *Irel, IndexBulkDeleteResult **stats, LVRelStats *vacrelstats, LVParallelState *lps, int nindexes); static void vacuum_one_index(Relation indrel, IndexBulkDeleteResult **stats, LVShared *lvshared, LVSharedIndStats *shared_indstats, - LVDeadTuples *dead_tuples); + LVDeadTuples *dead_tuples, LVRelStats *vacrelstats); static void lazy_cleanup_all_indexes(Relation *Irel, IndexBulkDeleteResult **stats, LVRelStats *vacrelstats, LVParallelState *lps, int nindexes); @@ -361,6 +376,9 @@ static void end_parallel_vacuum(Relation *Irel, IndexBulkDeleteResult **stats, LVParallelState *lps, int nindexes); static LVSharedIndStats *get_indstats(LVShared *lvshared, int n); static bool skip_parallel_vacuum_index(Relation indrel, LVShared *lvshared); +static void vacuum_error_callback(void *arg); +static void update_vacuum_error_cbarg(LVRelStats *errcbarg, int phase, + BlockNumber blkno, Relation rel); /* @@ -460,6 +478,9 @@ heap_vacuum_rel(Relation onerel, VacuumParams *params, vacrelstats = (LVRelStats *) palloc0(sizeof(LVRelStats)); + vacrelstats->relnamespace = get_namespace_name(RelationGetNamespace(onerel)); + vacrelstats->relname = pstrdup(RelationGetRelationName(onerel)); + vacrelstats->indname = NULL; vacrelstats->old_rel_pages = onerel->rd_rel->relpages; vacrelstats->old_live_tuples = onerel->rd_rel->reltuples; vacrelstats->num_index_scans = 0; @@ -699,7 +720,6 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, BlockNumber nblocks, blkno; HeapTupleData tuple; - char *relname; TransactionId relfrozenxid = onerel->rd_rel->relfrozenxid; TransactionId relminmxid = onerel->rd_rel->relminmxid; BlockNumber empty_pages, @@ -724,20 +744,20 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, PROGRESS_VACUUM_MAX_DEAD_TUPLES }; int64 initprog_val[3]; + ErrorContextCallback errcallback; pg_rusage_init(&ru0); - relname = RelationGetRelationName(onerel); if (aggressive) ereport(elevel, (errmsg("aggressively vacuuming \"%s.%s\"", - get_namespace_name(RelationGetNamespace(onerel)), - relname))); + vacrelstats->relnamespace, + vacrelstats->relname))); else ereport(elevel, (errmsg("vacuuming \"%s.%s\"", - get_namespace_name(RelationGetNamespace(onerel)), - relname))); + vacrelstats->relnamespace, + vacrelstats->relname))); empty_pages = vacuumed_pages = 0; next_fsm_block_to_vacuum = (BlockNumber) 0; @@ -870,6 +890,14 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, else skipping_blocks = false; + /* Setup error traceback support for ereport() */ + update_vacuum_error_cbarg(vacrelstats, VACUUM_ERRCB_PHASE_SCAN_HEAP, + InvalidBlockNumber, NULL); + errcallback.callback = vacuum_error_callback; + errcallback.arg = vacrelstats; + errcallback.previous = error_context_stack; + error_context_stack = &errcallback; + for (blkno = 0; blkno < nblocks; blkno++) { Buffer buf; @@ -891,6 +919,8 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, #define FORCE_CHECK_PAGE() \ (blkno == nblocks - 1 && should_attempt_truncation(params, vacrelstats)) + vacrelstats->blkno = blkno; + pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_SCANNED, blkno); if (blkno == next_unskippable_block) @@ -1005,12 +1035,18 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, * Vacuum the Free Space Map to make newly-freed space visible on * upper-level FSM pages. Note we have not yet processed blkno. */ + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_VACUUM_FSM, InvalidBlockNumber, NULL); FreeSpaceMapVacuumRange(onerel, next_fsm_block_to_vacuum, blkno); next_fsm_block_to_vacuum = blkno; /* Report that we are once again scanning the heap */ pgstat_progress_update_param(PROGRESS_VACUUM_PHASE, PROGRESS_VACUUM_PHASE_SCAN_HEAP); + + /* Set the error context while continuing heap scan */ + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_SCAN_HEAP, blkno, NULL); } /* @@ -1488,9 +1524,15 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, */ if (blkno - next_fsm_block_to_vacuum >= VACUUM_FSM_EVERY_PAGES) { + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_VACUUM_FSM, InvalidBlockNumber, + NULL); FreeSpaceMapVacuumRange(onerel, next_fsm_block_to_vacuum, blkno); next_fsm_block_to_vacuum = blkno; + /* Set the error context while continuing heap scan */ + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_SCAN_HEAP, blkno, NULL); } } @@ -1534,7 +1576,7 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, && VM_ALL_VISIBLE(onerel, blkno, &vmbuffer)) { elog(WARNING, "page is not marked all-visible but visibility map bit is set in relation \"%s\" page %u", - relname, blkno); + vacrelstats->relname, blkno); visibilitymap_clear(onerel, blkno, vmbuffer, VISIBILITYMAP_VALID_BITS); } @@ -1555,7 +1597,7 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, else if (PageIsAllVisible(page) && has_dead_tuples) { elog(WARNING, "page containing dead tuples is marked as all-visible in relation \"%s\" page %u", - relname, blkno); + vacrelstats->relname, blkno); PageClearAllVisible(page); MarkBufferDirty(buf); visibilitymap_clear(onerel, blkno, vmbuffer, @@ -1642,7 +1684,11 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, * not there were indexes. */ if (blkno > next_fsm_block_to_vacuum) + { + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_VACUUM_FSM, InvalidBlockNumber, NULL); FreeSpaceMapVacuumRange(onerel, next_fsm_block_to_vacuum, blkno); + } /* report all blocks vacuumed */ pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_VACUUMED, blkno); @@ -1651,6 +1697,9 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, if (vacrelstats->useindex) lazy_cleanup_all_indexes(Irel, indstats, vacrelstats, lps, nindexes); + /* Pop the error context stack */ + error_context_stack = errcallback.previous; + /* * End parallel mode before updating index statistics as we cannot write * during parallel mode. @@ -1744,7 +1793,7 @@ lazy_vacuum_all_indexes(Relation onerel, Relation *Irel, for (idx = 0; idx < nindexes; idx++) lazy_vacuum_index(Irel[idx], &stats[idx], vacrelstats->dead_tuples, - vacrelstats->old_live_tuples); + vacrelstats->old_live_tuples, vacrelstats); } /* Increase and report the number of index scans */ @@ -1847,6 +1896,10 @@ lazy_vacuum_page(Relation onerel, BlockNumber blkno, Buffer buffer, pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_VACUUMED, blkno); + /* Setup error traceback support for ereport() */ + update_vacuum_error_cbarg(vacrelstats, VACUUM_ERRCB_PHASE_VACUUM_HEAP, + blkno, NULL); + START_CRIT_SECTION(); for (; tupindex < dead_tuples->num_tuples; tupindex++) @@ -2083,7 +2136,7 @@ lazy_parallel_vacuum_indexes(Relation *Irel, IndexBulkDeleteResult **stats, * indexes in the case where no workers are launched. */ parallel_vacuum_index(Irel, stats, lps->lvshared, - vacrelstats->dead_tuples, nindexes); + vacrelstats->dead_tuples, nindexes, vacrelstats); /* Wait for all vacuum workers to finish */ WaitForParallelWorkersToFinish(lps->pcxt); @@ -2106,7 +2159,7 @@ lazy_parallel_vacuum_indexes(Relation *Irel, IndexBulkDeleteResult **stats, static void parallel_vacuum_index(Relation *Irel, IndexBulkDeleteResult **stats, LVShared *lvshared, LVDeadTuples *dead_tuples, - int nindexes) + int nindexes, LVRelStats *vacrelstats) { /* * Increment the active worker count if we are able to launch any worker. @@ -2140,7 +2193,7 @@ parallel_vacuum_index(Relation *Irel, IndexBulkDeleteResult **stats, /* Do vacuum or cleanup of the index */ vacuum_one_index(Irel[idx], &(stats[idx]), lvshared, shared_indstats, - dead_tuples); + dead_tuples, vacrelstats); } /* @@ -2180,7 +2233,8 @@ vacuum_indexes_leader(Relation *Irel, IndexBulkDeleteResult **stats, if (shared_indstats == NULL || skip_parallel_vacuum_index(Irel[i], lps->lvshared)) vacuum_one_index(Irel[i], &(stats[i]), lps->lvshared, - shared_indstats, vacrelstats->dead_tuples); + shared_indstats, vacrelstats->dead_tuples, + vacrelstats); } /* @@ -2200,7 +2254,7 @@ vacuum_indexes_leader(Relation *Irel, IndexBulkDeleteResult **stats, static void vacuum_one_index(Relation indrel, IndexBulkDeleteResult **stats, LVShared *lvshared, LVSharedIndStats *shared_indstats, - LVDeadTuples *dead_tuples) + LVDeadTuples *dead_tuples, LVRelStats *vacrelstats) { IndexBulkDeleteResult *bulkdelete_res = NULL; @@ -2220,10 +2274,10 @@ vacuum_one_index(Relation indrel, IndexBulkDeleteResult **stats, /* Do vacuum or cleanup of the index */ if (lvshared->for_cleanup) lazy_cleanup_index(indrel, stats, lvshared->reltuples, - lvshared->estimated_count); + lvshared->estimated_count, vacrelstats); else lazy_vacuum_index(indrel, stats, dead_tuples, - lvshared->reltuples); + lvshared->reltuples, vacrelstats); /* * Copy the index bulk-deletion result returned from ambulkdelete and @@ -2298,7 +2352,8 @@ lazy_cleanup_all_indexes(Relation *Irel, IndexBulkDeleteResult **stats, for (idx = 0; idx < nindexes; idx++) lazy_cleanup_index(Irel[idx], &stats[idx], vacrelstats->new_rel_tuples, - vacrelstats->tupcount_pages < vacrelstats->rel_pages); + vacrelstats->tupcount_pages < vacrelstats->rel_pages, + vacrelstats); } } @@ -2313,7 +2368,7 @@ lazy_cleanup_all_indexes(Relation *Irel, IndexBulkDeleteResult **stats, */ static void lazy_vacuum_index(Relation indrel, IndexBulkDeleteResult **stats, - LVDeadTuples *dead_tuples, double reltuples) + LVDeadTuples *dead_tuples, double reltuples, LVRelStats *vacrelstats) { IndexVacuumInfo ivinfo; const char *msg; @@ -2329,6 +2384,11 @@ lazy_vacuum_index(Relation indrel, IndexBulkDeleteResult **stats, ivinfo.num_heap_tuples = reltuples; ivinfo.strategy = vac_strategy; + /* Setup error traceback support for ereport() */ + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_VACUUM_INDEX, InvalidBlockNumber, + indrel); + /* Do bulk deletion */ *stats = index_bulk_delete(&ivinfo, *stats, lazy_tid_reaped, (void *) dead_tuples); @@ -2354,7 +2414,7 @@ lazy_vacuum_index(Relation indrel, IndexBulkDeleteResult **stats, static void lazy_cleanup_index(Relation indrel, IndexBulkDeleteResult **stats, - double reltuples, bool estimated_count) + double reltuples, bool estimated_count, LVRelStats *vacrelstats) { IndexVacuumInfo ivinfo; const char *msg; @@ -2371,6 +2431,10 @@ lazy_cleanup_index(Relation indrel, ivinfo.num_heap_tuples = reltuples; ivinfo.strategy = vac_strategy; + /* Setup error traceback support for ereport() */ + update_vacuum_error_cbarg(vacrelstats, + VACUUM_ERRCB_PHASE_INDEX_CLEANUP, InvalidBlockNumber, indrel); + *stats = index_vacuum_cleanup(&ivinfo, *stats); if (!(*stats)) @@ -3320,6 +3384,8 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc) int nindexes; char *sharedquery; IndexBulkDeleteResult **stats; + LVRelStats vacrelstats; + ErrorContextCallback errcallback; lvshared = (LVShared *) shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_SHARED, false); @@ -3341,6 +3407,18 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc) */ onerel = table_open(lvshared->relid, ShareUpdateExclusiveLock); + /* Init vacrelstats for use as error callback by parallel worker: */ + vacrelstats.relnamespace = get_namespace_name(RelationGetNamespace(onerel)); + vacrelstats.relname = pstrdup(RelationGetRelationName(onerel)); + vacrelstats.indname = NULL; + vacrelstats.phase = VACUUM_ERRCB_PHASE_UNKNOWN; /* Not yet processing */ + + /* Setup error traceback support for ereport() */ + errcallback.callback = vacuum_error_callback; + errcallback.arg = &vacrelstats; + errcallback.previous = error_context_stack; + error_context_stack = &errcallback; + /* * Open all indexes. indrels are sorted in order by OID, which should be * matched to the leader's one. @@ -3370,9 +3448,73 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc) maintenance_work_mem = lvshared->maintenance_work_mem_worker; /* Process indexes to perform vacuum/cleanup */ - parallel_vacuum_index(indrels, stats, lvshared, dead_tuples, nindexes); + parallel_vacuum_index(indrels, stats, lvshared, dead_tuples, nindexes, + &vacrelstats); vac_close_indexes(nindexes, indrels, RowExclusiveLock); table_close(onerel, ShareUpdateExclusiveLock); pfree(stats); } + +/* + * Error context callback for errors occurring during vacuum. + */ +static void +vacuum_error_callback(void *arg) +{ + LVRelStats *cbarg = arg; + + switch (cbarg->phase) { + case VACUUM_ERRCB_PHASE_SCAN_HEAP: + if (BlockNumberIsValid(cbarg->blkno)) + errcontext("while scanning block %u of relation \"%s.%s\"", + cbarg->blkno, cbarg->relnamespace, cbarg->relname); + break; + + case VACUUM_ERRCB_PHASE_VACUUM_HEAP: + if (BlockNumberIsValid(cbarg->blkno)) + errcontext("while vacuuming block %u of relation \"%s.%s\"", + cbarg->blkno, cbarg->relnamespace, cbarg->relname); + break; + + case VACUUM_ERRCB_PHASE_VACUUM_INDEX: + errcontext("while vacuuming index \"%s\" of relation \"%s.%s\"", + cbarg->indname, cbarg->relnamespace, cbarg->relname); + break; + + case VACUUM_ERRCB_PHASE_INDEX_CLEANUP: + errcontext("while cleaning up index \"%s\" of relation \"%s.%s\"", + cbarg->indname, cbarg->relnamespace, cbarg->relname); + break; + + case VACUUM_ERRCB_PHASE_VACUUM_FSM: + errcontext("while vacuuming free space map of relation \"%s.%s\"", + cbarg->relnamespace, cbarg->relname); + break; + + case VACUUM_ERRCB_PHASE_UNKNOWN: + default: + return; /* do nothing; the cbarg maybe isn't yet initialized */ + } +} + +/* Update vacuum error callback for current phase, block and index */ +static void +update_vacuum_error_cbarg(LVRelStats *errcbarg, int phase, BlockNumber blkno, + Relation indrel) +{ + errcbarg->blkno = blkno; + errcbarg->phase = phase; + + /* Free index name from any previous phase */ + if (errcbarg->indname) { + pfree(errcbarg->indname); + errcbarg->indname = NULL; + } + + /* For index phases, save the name of the current index for the callback */ + if (indrel) { + Assert(indrel->rd_rel->relkind == RELKIND_INDEX); + errcbarg->indname = pstrdup(RelationGetRelationName(indrel)); + } +} -- 2.17.0