From 2cdf97fd1ec86301c70ccffb2414a6047c9f8dd1 Mon Sep 17 00:00:00 2001 From: Alvaro Herrera Date: Wed, 13 Oct 2021 18:49:27 -0300 Subject: [PATCH] Change recently added test code for stability The test code added with ff9f111bce24 fails under valgrind, and probably other slow cases too, because if (say) autovacuum runs in between and produces WAL of its own, the large INSERT fails to account for that in the LSN calculations. Rewrite to use a DO loop. Per complaint from Andres Freund Backpatch to all branches. Discussion: https://postgr.es/m/20211013180338.5guyqzpkcisqugrl@alap3.anarazel.de --- .../recovery/t/026_overwrite_contrecord.pl | 39 +++++++++++-------- 1 file changed, 22 insertions(+), 17 deletions(-) diff --git a/src/test/recovery/t/026_overwrite_contrecord.pl b/src/test/recovery/t/026_overwrite_contrecord.pl index 7c9c44689a2..c35e3717276 100644 --- a/src/test/recovery/t/026_overwrite_contrecord.pl +++ b/src/test/recovery/t/026_overwrite_contrecord.pl @@ -22,27 +22,32 @@ $node->init(allows_streaming => 1); $node->append_conf('postgresql.conf', 'wal_keep_size=1GB'); $node->start; -$node->safe_psql('postgres', 'create table filler (a int)'); -# First, measure how many bytes does the insertion of 1000 rows produce -my $start_lsn = - $node->safe_psql('postgres', q{select pg_current_wal_insert_lsn() - '0/0'}); -$node->safe_psql('postgres', - 'insert into filler select * from generate_series(1, 1000)'); -my $end_lsn = - $node->safe_psql('postgres', q{select pg_current_wal_insert_lsn() - '0/0'}); -my $rows_walsize = $end_lsn - $start_lsn; +$node->safe_psql('postgres', 'create table filler (a int, b text)'); # Now consume all remaining room in the current WAL segment, leaving # space enough only for the start of a largish record. $node->safe_psql( - 'postgres', qq{ -WITH setting AS ( - SELECT setting::int AS wal_segsize - FROM pg_settings WHERE name = 'wal_segment_size' -) -INSERT INTO filler -SELECT g FROM setting, - generate_series(1, 1000 * (wal_segsize - ((pg_current_wal_insert_lsn() - '0/0') % wal_segsize)) / $rows_walsize) g + 'postgres', q{ +DO $$ +DECLARE + wal_segsize int := setting::int FROM pg_settings WHERE name = 'wal_segment_size'; + remain int; + iters int := 0; +BEGIN + LOOP + INSERT into filler + select g, repeat(md5(g::text), (random() * 60 + 1)::int) + from generate_series(1, 10) g; + + remain := wal_segsize - (pg_current_wal_insert_lsn() - '0/0') % wal_segsize; + IF remain < 2 * setting::int from pg_settings where name = 'block_size' THEN + RAISE log 'exiting after % iterations, % bytes to end of WAL segment', iters, remain; + EXIT; + END IF; + iters := iters + 1; + END LOOP; +END +$$; }); my $initfile = $node->safe_psql('postgres',