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Make new replication slot test code less racy

The new test code added inead9e51 is racy -- it hinges onshared-memory state, which changes before the WARNING message is logged.Put it the other way around.Backpatch to 13.Author: Álvaro Herrera <alvherre@alvh.no-ip.org>Discussion:https://postgr.es/m/202107161809.zclasccpfcg3@alvherre.pgsql

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src/test/recovery/t
- 019_replslot_limit.pl

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`‎src/test/recovery/t/019_replslot_limit.pl`

Lines changed: 15 additions & 12 deletions

Original file line number	Diff line number	Diff line change
`@@ -177,18 +177,21 @@`
`177`	`177`	`my$logstart = get_log_size($node_primary);`
`178`	`178`	`advance_wal($node_primary, 7);`
`179`	`179`
`180`		`-# This slot should be broken, wait for that to happen`
`181`		`-$node_primary->poll_query_until(`
`182`		`-'postgres',`
`183`		`-qq[SELECT wal_status = 'lost' FROM pg_replication_slots`
`184`		`-WHERE slot_name = 'rep1']);`
`185`		`-`
`186`		`-# WARNING should be issued`
`187`		`-ok( find_in_log(`
`188`		`-$node_primary,`
`189`		`-"invalidating slot\"rep1\" because its restart_lsn [0-9A-F/]+ exceeds max_slot_wal_keep_size",`
`190`		`-$logstart),`
`191`		`-'check that the warning is logged');`
	`180`	`+# wait until the WARNING is issued`
	`181`	`+my$invalidated = 0;`
	`182`	`+for (my$i = 0;$i < 10000;$i++)`
	`183`	`+{`
	`184`	`+if (find_in_log(`
	`185`	`+$node_primary,`
	`186`	`+"invalidating slot\"rep1\" because its restart_lsn [0-9A-F/]+ exceeds max_slot_wal_keep_size",`
	`187`	`+$logstart))`
	`188`	`+{`
	`189`	`+$invalidated = 1;`
	`190`	`+last;`
	`191`	`+}`
	`192`	`+usleep(100_000);`
	`193`	`+}`
	`194`	`+ok($invalidated,'check that slot invalidation has been logged');`
`192`	`195`
`193`	`196`	`$result =$node_primary->safe_psql(`
`194`	`197`	`'postgres',`

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Commit8589299

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`‎src/test/recovery/t/019_replslot_limit.pl`

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