From fb53a62620aab180e8b250be50fefac1b40f50c2 Mon Sep 17 00:00:00 2001 From: Justin Pryzby Date: Thu, 12 Dec 2019 20:54:37 -0600 Subject: [PATCH v15 1/2] vacuum errcontext to show block being processed As requested here. https://www.postgresql.org/message-id/20190807235154.erbmr4o4bo6vgnjv%40alap3.anarazel.de --- src/backend/access/heap/vacuumlazy.c | 85 +++++++++++++++++++++++++++++++++++- 1 file changed, 84 insertions(+), 1 deletion(-) diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c index 8ce5011..d11c7af 100644 --- a/src/backend/access/heap/vacuumlazy.c +++ b/src/backend/access/heap/vacuumlazy.c @@ -292,6 +292,13 @@ typedef struct LVRelStats bool lock_waiter_detected; } LVRelStats; +typedef struct +{ + char *relnamespace; + char *relname; + BlockNumber blkno; + int stage; /* 0: scan heap; 1: vacuum heap; 2: vacuum index */ +} vacuum_error_callback_arg; /* A few variables that don't seem worth passing around as parameters */ static int elevel = -1; @@ -361,6 +368,7 @@ 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); /* @@ -724,6 +732,8 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, PROGRESS_VACUUM_MAX_DEAD_TUPLES }; int64 initprog_val[3]; + ErrorContextCallback errcallback; + vacuum_error_callback_arg errcbarg; pg_rusage_init(&ru0); @@ -870,6 +880,17 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, else skipping_blocks = false; + /* Setup error traceback support for ereport() */ + errcbarg.relnamespace = get_namespace_name(RelationGetNamespace(onerel)); + errcbarg.relname = relname; + errcbarg.blkno = InvalidBlockNumber; /* Not known yet */ + errcbarg.stage = 0; + + errcallback.callback = vacuum_error_callback; + errcallback.arg = (void *) &errcbarg; + errcallback.previous = error_context_stack; + error_context_stack = &errcallback; + for (blkno = 0; blkno < nblocks; blkno++) { Buffer buf; @@ -891,6 +912,8 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, #define FORCE_CHECK_PAGE() \ (blkno == nblocks - 1 && should_attempt_truncation(params, vacrelstats)) + errcbarg.blkno = blkno; + pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_SCANNED, blkno); if (blkno == next_unskippable_block) @@ -987,13 +1010,18 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, vmbuffer = InvalidBuffer; } + /* Pop the error context stack */ + error_context_stack = errcallback.previous; + /* Work on all the indexes, then the heap */ lazy_vacuum_all_indexes(onerel, Irel, indstats, vacrelstats, lps, nindexes); - /* Remove tuples from heap */ lazy_vacuum_heap(onerel, vacrelstats); + /* Replace error context while continuing heap scan */ + error_context_stack = &errcallback; + /* * Forget the now-vacuumed tuples, and press on, but be careful * not to reset latestRemovedXid since we want that value to be @@ -1597,6 +1625,9 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats, RecordPageWithFreeSpace(onerel, blkno, freespace); } + /* Pop the error context stack */ + error_context_stack = errcallback.previous; + /* report that everything is scanned and vacuumed */ pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_SCANNED, blkno); @@ -1772,11 +1803,25 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats) int npages; PGRUsage ru0; Buffer vmbuffer = InvalidBuffer; + ErrorContextCallback errcallback; + vacuum_error_callback_arg errcbarg; /* Report that we are now vacuuming the heap */ pgstat_progress_update_param(PROGRESS_VACUUM_PHASE, PROGRESS_VACUUM_PHASE_VACUUM_HEAP); + /* + * Setup error traceback support for ereport() + * ->relnamespace and ->relname are already set + */ + errcbarg.blkno = InvalidBlockNumber; /* Not known yet */ + errcbarg.stage = 1; + + errcallback.callback = vacuum_error_callback; + errcallback.arg = (void *) &errcbarg; + errcallback.previous = error_context_stack; + error_context_stack = &errcallback; + pg_rusage_init(&ru0); npages = 0; @@ -1791,6 +1836,7 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats) vacuum_delay_point(); tblk = ItemPointerGetBlockNumber(&vacrelstats->dead_tuples->itemptrs[tupindex]); + errcbarg.blkno = tblk; buf = ReadBufferExtended(onerel, MAIN_FORKNUM, tblk, RBM_NORMAL, vac_strategy); if (!ConditionalLockBufferForCleanup(buf)) @@ -1811,6 +1857,9 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats) npages++; } + /* Pop the error context stack */ + error_context_stack = errcallback.previous; + if (BufferIsValid(vmbuffer)) { ReleaseBuffer(vmbuffer); @@ -2318,6 +2367,8 @@ lazy_vacuum_index(Relation indrel, IndexBulkDeleteResult **stats, IndexVacuumInfo ivinfo; const char *msg; PGRUsage ru0; + ErrorContextCallback errcallback; + vacuum_error_callback_arg errcbarg; pg_rusage_init(&ru0); @@ -2329,10 +2380,23 @@ lazy_vacuum_index(Relation indrel, IndexBulkDeleteResult **stats, ivinfo.num_heap_tuples = reltuples; ivinfo.strategy = vac_strategy; + /* Setup error traceback support for ereport() */ + errcbarg.relnamespace = get_namespace_name(RelationGetNamespace(indrel)); + errcbarg.relname = RelationGetRelationName(indrel); + errcbarg.stage = 2; + + errcallback.callback = vacuum_error_callback; + errcallback.arg = (void *) &errcbarg; + errcallback.previous = error_context_stack; + error_context_stack = &errcallback; + /* Do bulk deletion */ *stats = index_bulk_delete(&ivinfo, *stats, lazy_tid_reaped, (void *) dead_tuples); + /* Pop the error context stack */ + error_context_stack = errcallback.previous; + if (IsParallelWorker()) msg = gettext_noop("scanned index \"%s\" to remove %d row versions by parallel vacuum worker"); else @@ -3375,3 +3439,22 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc) table_close(onerel, ShareUpdateExclusiveLock); pfree(stats); } + +/* + * Error context callback for errors occurring during vacuum. + */ +static void +vacuum_error_callback(void *arg) +{ + vacuum_error_callback_arg *cbarg = arg; + + if (cbarg->stage == 0) + errcontext(_("while scanning block %u of relation \"%s.%s\""), + cbarg->blkno, cbarg->relnamespace, cbarg->relname); + else if (cbarg->stage == 1) + errcontext(_("while vacuuming block %u of relation \"%s.%s\""), + cbarg->blkno, cbarg->relnamespace, cbarg->relname); + else if (cbarg->stage == 2) + errcontext(_("while vacuuming index \"%s.%s\""), + cbarg->relnamespace, cbarg->relname); +} -- 2.7.4