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Commit54a16df

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Make the pg_rewind regression tests more robust on slow systems.
There were a couple of hard-coded sleeps in the tests: to wait for standbyto catch up with master, and to wait for promotion with "pg_ctl promote"to complete. Instead of a fixed, hard-coded sleep, poll the server with aquery once a second. This isn't ideal either, and I wish we had a bettersolution for real-world applications too, but this should fix theimmediate problem.Patch by Michael Paquier, with some editing by me.
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‎src/bin/pg_rewind/RewindTest.pm

Lines changed: 41 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -125,6 +125,37 @@ sub check_query
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}
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}
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128+
# Run a query once a second, until it returns 't' (i.e. SQL boolean true).
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subpoll_query_until
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{
131+
my ($query,$connstr) =@_;
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my$max_attempts = 30;
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my$attempts = 0;
135+
my ($stdout,$stderr);
136+
137+
while ($attempts <$max_attempts)
138+
{
139+
my$cmd = ['psql','-At','-c',"$query",'-d',"$connstr" ];
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my$result = run$cmd,'>', \$stdout,'2>', \$stderr;
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chomp($stdout);
143+
if ($stdouteq"t")
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{
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return 1;
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}
147+
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# Wait a second before retrying.
149+
sleep 1;
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$attempts++;
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}
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# The query result didn't change in 30 seconds. Give up. Print the stderr
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# from the last attempt, hopefully that's useful for debugging.
155+
diag$stderr;
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return 0;
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}
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128159
subappend_to_file
129160
{
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my($filename,$str) =@_;
@@ -185,16 +216,19 @@ sub create_standby
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# Base backup is taken with xlog files included
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system_or_bail("pg_basebackup -D$test_standby_datadir -p$port_master -x >>$log_path 2>&1");
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append_to_file("$test_standby_datadir/recovery.conf",qq(
188-
primary_conninfo='$connstr_master'
219+
primary_conninfo='$connstr_master application_name=rewind_standby'
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standby_mode=on
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recovery_target_timeline='latest'
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));
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# Start standby
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system_or_bail("pg_ctl -w -D$test_standby_datadir -o\"-k$tempdir_short --listen-addresses='' -p$port_standby\" start >>$log_path 2>&1");
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196-
# sleep a bit to make sure the standby has caught up.
197-
sleep 1;
227+
# Wait until the standby has caught up with the primary, by polling
228+
# pg_stat_replication.
229+
my$caughtup_query ="SELECT pg_current_xlog_location() = replay_location FROM pg_stat_replication WHERE application_name = 'rewind_standby';";
230+
poll_query_until($caughtup_query,$connstr_master)
231+
ordie"Timed out while waiting for standby to catch up";
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}
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subpromote_standby
@@ -203,9 +237,11 @@ sub promote_standby
203237
# up standby
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# Now promote slave and insert some new data on master, this will put
206-
# the master out-of-sync with the standby.
240+
# the master out-of-sync with the standby. Wait until the standby is
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# out of recovery mode, and is ready to accept read-write connections.
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system_or_bail("pg_ctl -w -D$test_standby_datadir promote >>$log_path 2>&1");
208-
sleep 2;
243+
poll_query_until("SELECT NOT pg_is_in_recovery()",$connstr_standby)
244+
ordie"Timed out while waiting for promotion of standby";
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}
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211247
subrun_pg_rewind

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