Bug#36345 Test 'func_misc' fails on RHAS3 x86_64
Fix for this bug and a second similar problem found during experimenting. This replaces the first fix (already pushed to 5.1 and merged to 6.0) which - failed in runs with the embedded server - cannot be ported back to 5.0
This commit is contained in:
Matthias Leich mleich@mysql.com
parent
9aa8ba55f0
commit
361dcb1a90
@ -99,41 +99,99 @@ t1 CREATE TABLE `t1` (
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`length(uuid())` int(10) NOT NULL default '0'
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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create table t1 (a timestamp default '2005-05-05 01:01:01',
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b timestamp default '2005-05-05 01:01:01');
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insert into t1 set a = now();
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select sleep(3);
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sleep(3)
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0
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update t1 set b = now();
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select timediff(b, a) >= '00:00:03' from t1;
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timediff(b, a) >= '00:00:03'
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#------------------------------------------------------------------------
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# Tests for Bug#6760 and Bug#12689
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SET @row_count = 4;
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SET @sleep_time_per_result_row = 1;
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SET @max_acceptable_delay = 2;
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SET @@global.query_cache_size = 1024 * 64;
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DROP TEMPORARY TABLE IF EXISTS t_history;
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DROP TABLE IF EXISTS t1;
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CREATE TEMPORARY TABLE t_history (attempt SMALLINT,
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start_ts DATETIME, end_ts DATETIME,
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start_cached INTEGER, end_cached INTEGER);
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CREATE TABLE t1 (f1 BIGINT);
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INSERT INTO t1 VALUES (1);
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INSERT INTO t1 VALUES (1);
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INSERT INTO t1 VALUES (1);
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INSERT INTO t1 VALUES (1);
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INSERT INTO t_history
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SET attempt = 4 - 4 + 1, start_ts = NOW(),
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start_cached = 0;
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SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
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f1 SLEEP(@sleep_time_per_result_row)
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1 0
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1 0
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1 0
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1 0
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UPDATE t_history SET end_ts = NOW()
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WHERE attempt = 4 - 4 + 1;
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UPDATE t_history SET end_cached = 0
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WHERE attempt = 4 - 4 + 1;
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INSERT INTO t_history
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SET attempt = 4 - 3 + 1, start_ts = NOW(),
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start_cached = 0;
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SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
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f1 SLEEP(@sleep_time_per_result_row)
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1 0
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1 0
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1 0
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1 0
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UPDATE t_history SET end_ts = NOW()
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WHERE attempt = 4 - 3 + 1;
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UPDATE t_history SET end_cached = 0
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WHERE attempt = 4 - 3 + 1;
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INSERT INTO t_history
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SET attempt = 4 - 2 + 1, start_ts = NOW(),
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start_cached = 0;
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SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
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f1 SLEEP(@sleep_time_per_result_row)
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1 0
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1 0
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1 0
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1 0
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UPDATE t_history SET end_ts = NOW()
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WHERE attempt = 4 - 2 + 1;
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UPDATE t_history SET end_cached = 0
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WHERE attempt = 4 - 2 + 1;
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INSERT INTO t_history
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SET attempt = 4 - 1 + 1, start_ts = NOW(),
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start_cached = 0;
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SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
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f1 SLEEP(@sleep_time_per_result_row)
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1 0
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1 0
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1 0
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1 0
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UPDATE t_history SET end_ts = NOW()
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WHERE attempt = 4 - 1 + 1;
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UPDATE t_history SET end_cached = 0
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WHERE attempt = 4 - 1 + 1;
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# Test 1: Does the query with SLEEP need a reasonable time?
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SELECT COUNT(*) > 4 - 1 INTO @aux1 FROM t_history
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WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
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BETWEEN 0 AND @max_acceptable_delay;
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SELECT @aux1 AS "Expect 1";
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Expect 1
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1
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drop table t1;
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set global query_cache_size=1355776;
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create table t1 (a int);
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insert into t1 values (1),(1),(1);
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create table t2 (a datetime default null, b datetime default null);
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insert into t2 set a = now();
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select a from t1 where sleep(1);
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a
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update t2 set b = now() where b is null;
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insert into t2 set a = now();
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select a from t1 where sleep(a);
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a
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update t2 set b = now() where b is null;
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insert into t2 set a = now();
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select a from t1 where sleep(1);
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a
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update t2 set b = now() where b is null;
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select timediff(b, a) >= '00:00:03' from t2;
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timediff(b, a) >= '00:00:03'
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# Test 2: Does the query with SLEEP need a reasonable time even in case
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# of the non first execution?
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SELECT COUNT(*) > 4 - 1 - 1 INTO @aux2 FROM t_history
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WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
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BETWEEN 0 AND @max_acceptable_delay
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AND attempt > 1;
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SELECT @aux2 AS "Expect 1";
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Expect 1
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1
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# Test 3: The query with SLEEP must be not cached.
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SELECT COUNT(*) = 4 INTO @aux3 FROM t_history
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WHERE end_cached = start_cached;
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SELECT @aux3 AS "Expect 1";
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Expect 1
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1
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1
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drop table t2;
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drop table t1;
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set global query_cache_size=default;
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DROP TABLE t1;
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DROP TEMPORARY TABLE t_history;
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SET @@global.query_cache_size = default;
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create table t1 select INET_ATON('255.255.0.1') as `a`;
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show create table t1;
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Table Create Table
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@ -94,36 +94,192 @@ show create table t1;
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drop table t1;
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#
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# Bug #6760: Add SLEEP() function
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# Bug#6760: Add SLEEP() function (feature request)
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#
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create table t1 (a timestamp default '2005-05-05 01:01:01',
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b timestamp default '2005-05-05 01:01:01');
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insert into t1 set a = now();
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select sleep(3);
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update t1 set b = now();
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select timediff(b, a) >= '00:00:03' from t1;
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drop table t1;
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# Logics of original test:
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# Reveal that a query with SLEEP does not need less time than estimated.
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#
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# Bug#12689: SLEEP() gets incorrectly cached/optimized-away
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#
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set global query_cache_size=1355776;
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create table t1 (a int);
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insert into t1 values (1),(1),(1);
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create table t2 (a datetime default null, b datetime default null);
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insert into t2 set a = now();
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select a from t1 where sleep(1);
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update t2 set b = now() where b is null;
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insert into t2 set a = now();
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select a from t1 where sleep(a);
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update t2 set b = now() where b is null;
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insert into t2 set a = now();
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select a from t1 where sleep(1);
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update t2 set b = now() where b is null;
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select timediff(b, a) >= '00:00:03' from t2;
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drop table t2;
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drop table t1;
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set global query_cache_size=default;
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# Description from bug report (slightly modified)
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#
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# Bug 1 (happened all time):
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# SELECT * FROM t1 WHERE SLEEP(1) will only result in a sleep of 1
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# second, regardless of the number of rows in t1.
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# Bug 2 (happened all time):
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# Such a query will also get cached by the query cache, but should not.
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#
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# Notes (mleich, 2008-05)
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# =======================
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#
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# Experiments around
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# Bug#36345 Test 'func_misc' fails on RHAS3 x86_64
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# showed that the tests for both bugs could produce in case of parallel
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# artificial system time (like via ntpd)
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# - decreases false alarm
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# - increases false success
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#
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# We try here to circumvent these issues by reimplementation of the tests
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# and sophisticated scripting, although the cause of the problems is a massive
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# error within the setup of the testing environment.
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# Tests relying on or checking derivates of the system time must never meet
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# parallel manipulations of system time.
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#
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# Results of experiments with/without manipulation of system time,
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# information_schema.processlist content, high load on testing box
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# ----------------------------------------------------------------
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# Definition: Predicted_cumulative_sleep_time =
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# #_of_result_rows * sleep_time_per_result_row
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#
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# 1. Total (real sleep time) ~= predicted_cumulative_sleep_time !!
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# 2. The state of a session within the PROCESSLIST changes to 'User sleep'
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# if the sessions runs a statement containing the sleep function and the
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# processing of the statement is just within the phase where the sleep
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# is done. (*)
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# 3. NOW() and processlist.time behave "synchronous" to system time and
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# show also the "jumps" caused by system time manipulations. (*)
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# 4. processlist.time is unsigned, the "next" value below 0 is ~ 4G (*)
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# 5. Current processlist.time ~= current real sleep time if the system time
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# was not manipulated. (*)
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# 6. High system load can cause delays of <= 2 seconds.
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# 7. Thanks to Davi for excellent hints and ideas.
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#
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# (*)
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# - information_schema.processlist is not available before MySQL 5.1.
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# - Observation of processlist content requires a
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# - "worker" session sending the query with "send" and pulling results
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# with "reap"
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# - session observing the processlist parallel to the worker session
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# "send" and "reap" do not work in case of an embedded server.
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# Conclusion: Tests based on processlist have too many restrictions.
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#
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# Solutions for subtests based on TIMEDIFF of values filled via NOW()
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# -------------------------------------------------------------------
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# Run the following sequence three times
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# 1. SELECT <start_time>
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# 2. Query with SLEEP
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# 3. SELECT <end_time>
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# If TIMEDIFF(<end_time>,<start_time>) is at least two times within a
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# reasonable range assume that we did not met errors we were looking for.
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#
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# It is extreme unlikely that we have two system time changes within the
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# < 30 seconds runtime. Even if the unlikely happens, there are so
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# frequent runs of this test on this or another testing box which will
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# catch the problem.
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#
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--echo #------------------------------------------------------------------------
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--echo # Tests for Bug#6760 and Bug#12689
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# Number of rows within the intended result set.
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SET @row_count = 4;
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# Parameter within SLEEP function
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SET @sleep_time_per_result_row = 1;
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# Maximum acceptable delay caused by high load on testing box
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SET @max_acceptable_delay = 2;
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# TIMEDIFF = time for query with sleep (mostly the time caused by SLEEP)
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# + time for delays caused by high load on testing box
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# Ensure that at least a reasonable fraction of TIMEDIFF is belongs to the SLEEP
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# by appropriate setting of variables.
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# Ensure that any "judging" has a base of minimum three attempts.
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# (Test 2 uses all attempts except the first one.)
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if (!` SELECT (@sleep_time_per_result_row * @row_count - @max_acceptable_delay >
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@sleep_time_per_result_row) AND (@row_count - 1 >= 3)`)
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{
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--echo # Have to abort because of error in plausibility check
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--echo ######################################################
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--vertical_results
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SELECT @sleep_time_per_result_row * @row_count - @max_acceptable_delay >
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@sleep_time_per_result_row AS must_be_1,
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@row_count - 1 >= 3 AS must_be_also_1,
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@sleep_time_per_result_row, @row_count, @max_acceptable_delay;
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exit;
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}
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SET @@global.query_cache_size = 1024 * 64;
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--disable_warnings
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DROP TEMPORARY TABLE IF EXISTS t_history;
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DROP TABLE IF EXISTS t1;
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--enable_warnings
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CREATE TEMPORARY TABLE t_history (attempt SMALLINT,
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start_ts DATETIME, end_ts DATETIME,
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start_cached INTEGER, end_cached INTEGER);
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CREATE TABLE t1 (f1 BIGINT);
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let $num = `SELECT @row_count`;
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while ($num)
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{
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INSERT INTO t1 VALUES (1);
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dec $num;
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}
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let $loops = 4;
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let $num = $loops;
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while ($num)
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{
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let $Qcache_queries_in_cache =
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query_get_value(SHOW STATUS LIKE 'Qcache_queries_in_cache', Value, 1);
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eval
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INSERT INTO t_history
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SET attempt = $loops - $num + 1, start_ts = NOW(),
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start_cached = $Qcache_queries_in_cache;
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SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
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#
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# Do not determine Qcache_queries_in_cache before updating end_ts. The SHOW
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# might cost too much time on an overloaded box.
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eval
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UPDATE t_history SET end_ts = NOW()
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WHERE attempt = $loops - $num + 1;
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let $Qcache_queries_in_cache =
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query_get_value(SHOW STATUS LIKE 'Qcache_queries_in_cache', Value, 1);
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eval
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UPDATE t_history SET end_cached = $Qcache_queries_in_cache
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WHERE attempt = $loops - $num + 1;
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# DEBUG eval SELECT * FROM t_history WHERE attempt = $loops - $num + 1;
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dec $num;
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}
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# 1. The majority of queries with SLEEP must need a reasonable time
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# -> SLEEP has an impact on runtime
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# = Replacement for original Bug#6760 test
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# -> total runtime is clear more needed than for one result row needed
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# = Replacement for one of the original Bug#12689 tests
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--echo # Test 1: Does the query with SLEEP need a reasonable time?
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eval SELECT COUNT(*) > $loops - 1 INTO @aux1 FROM t_history
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WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
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BETWEEN 0 AND @max_acceptable_delay;
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SELECT @aux1 AS "Expect 1";
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#
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# 2. The majority of queries (the first one must be ignored) with SLEEP must
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# need a reasonable time
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# -> If we assume that the result of a cached query will be sent back
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# immediate, without any sleep, than the query with SLEEP cannot be cached
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# (current and intended behaviour for queries with SLEEP).
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# -> It could be also not excluded that the query was cached but the server
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# honoured somehow the SLEEP. Such a behaviour would be also acceptable.
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# = Replacement for one of the original Bug#12689 tests
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--echo # Test 2: Does the query with SLEEP need a reasonable time even in case
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--echo # of the non first execution?
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eval SELECT COUNT(*) > $loops - 1 - 1 INTO @aux2 FROM t_history
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WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
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BETWEEN 0 AND @max_acceptable_delay
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AND attempt > 1;
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SELECT @aux2 AS "Expect 1";
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#
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# 3. The query with SLEEP should be not cached.
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# -> SHOW STATUS Qcache_queries_in_cache must be not incremented after
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# the execution of the query with SLEEP
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--echo # Test 3: The query with SLEEP must be not cached.
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eval SELECT COUNT(*) = $loops INTO @aux3 FROM t_history
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WHERE end_cached = start_cached;
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SELECT @aux3 AS "Expect 1";
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#
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# Dump the content of t_history if one of the tests failed.
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if (`SELECT @aux1 + @aux2 + @aux3 <> 3`)
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{
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--echo # Some tests failed, dumping the content of t_history
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SELECT * FROM t_history;
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}
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DROP TABLE t1;
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DROP TEMPORARY TABLE t_history;
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SET @@global.query_cache_size = default;
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#
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# Bug #21466: INET_ATON() returns signed, not unsigned
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