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| 1 | +# Test WAL replay of FSM changes. |
| 2 | +# |
| 3 | +# FSM changes don't normally need to be WAL-logged, except for truncation. |
| 4 | +# The FSM mustn't return a page that doesn't exist (anymore). |
| 5 | +use strict; |
| 6 | +use warnings; |
| 7 | + |
| 8 | +use PostgresNode; |
| 9 | +use TestLib; |
| 10 | +use Test::More tests => 1; |
| 11 | + |
| 12 | +my $node_master = get_new_node('master'); |
| 13 | +$node_master->init(allows_streaming => 1); |
| 14 | + |
| 15 | +$node_master->append_conf('postgresql.conf', qq{ |
| 16 | +fsync = on |
| 17 | +wal_level = replica |
| 18 | +wal_log_hints = on |
| 19 | +max_prepared_transactions = 5 |
| 20 | +autovacuum = off |
| 21 | +}); |
| 22 | + |
| 23 | +# Create a master node and its standby, initializing both with some data |
| 24 | +# at the same time. |
| 25 | +$node_master->start; |
| 26 | + |
| 27 | +$node_master->backup('master_backup'); |
| 28 | +my $node_standby = get_new_node('standby'); |
| 29 | +$node_standby->init_from_backup($node_master, 'master_backup', |
| 30 | + has_streaming => 1); |
| 31 | +$node_standby->start; |
| 32 | + |
| 33 | +$node_master->psql('postgres', qq{ |
| 34 | +create table testtab (a int, b char(100)); |
| 35 | +insert into testtab select generate_series(1,1000), 'foo'; |
| 36 | +insert into testtab select generate_series(1,1000), 'foo'; |
| 37 | +delete from testtab where ctid > '(8,0)'; |
| 38 | +}); |
| 39 | + |
| 40 | +# Take a lock on the table to prevent following vacuum from truncating it |
| 41 | +$node_master->psql('postgres', qq{ |
| 42 | +begin; |
| 43 | +lock table testtab in row share mode; |
| 44 | +prepare transaction 'p1'; |
| 45 | +}); |
| 46 | + |
| 47 | +# Vacuum, update FSM without truncation |
| 48 | +$node_master->psql('postgres', 'vacuum verbose testtab'); |
| 49 | + |
| 50 | +# Force a checkpoint |
| 51 | +$node_master->psql('postgres', 'checkpoint'); |
| 52 | + |
| 53 | +# Now do some more insert/deletes, another vacuum to ensure full-page writes |
| 54 | +# are done |
| 55 | +$node_master->psql('postgres', qq{ |
| 56 | +insert into testtab select generate_series(1,1000), 'foo'; |
| 57 | +delete from testtab where ctid > '(8,0)'; |
| 58 | +vacuum verbose testtab; |
| 59 | +}); |
| 60 | + |
| 61 | +# Ensure all buffers are now clean on the standby |
| 62 | +$node_standby->psql('postgres', 'checkpoint'); |
| 63 | + |
| 64 | +# Release the lock, vacuum again which should lead to truncation |
| 65 | +$node_master->psql('postgres', qq{ |
| 66 | +rollback prepared 'p1'; |
| 67 | +vacuum verbose testtab; |
| 68 | +}); |
| 69 | + |
| 70 | +$node_master->psql('postgres', 'checkpoint'); |
| 71 | +my $until_lsn = |
| 72 | + $node_master->safe_psql('postgres', "SELECT pg_current_xlog_location();"); |
| 73 | + |
| 74 | +# Wait long enough for standby to receive and apply all WAL |
| 75 | +my $caughtup_query = |
| 76 | + "SELECT '$until_lsn'::pg_lsn <= pg_last_xlog_replay_location()"; |
| 77 | +$node_standby->poll_query_until('postgres', $caughtup_query) |
| 78 | + or die "Timed out while waiting for standby to catch up"; |
| 79 | + |
| 80 | +# Promote the standby |
| 81 | +$node_standby->promote; |
| 82 | +$node_standby->poll_query_until('postgres', |
| 83 | + "SELECT NOT pg_is_in_recovery()") |
| 84 | + or die "Timed out while waiting for promotion of standby"; |
| 85 | +$node_standby->psql('postgres', 'checkpoint'); |
| 86 | + |
| 87 | +# Restart to discard in-memory copy of FSM |
| 88 | +$node_standby->restart; |
| 89 | + |
| 90 | +# Insert should work on standby |
| 91 | +is($node_standby->psql('postgres', |
| 92 | + qq{insert into testtab select generate_series(1,1000), 'foo';}), |
| 93 | + 0, 'INSERT succeeds with truncated relation FSM'); |
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