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Bug#36345 Test 'func_misc' fails on RHAS3 x86_64

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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 2008-05-29 18:38:10 +02:00
parent 9aa8ba55f0
commit 361dcb1a90
2 changed files with 273 additions and 59 deletions
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122
mysql-test/r/func_misc.result
View File

@ -99,41 +99,99 @@ t1 CREATE TABLE `t1` (
`length(uuid())` int(10) NOT NULL default '0' `length(uuid())` int(10) NOT NULL default '0'
) ENGINE=MyISAM DEFAULT CHARSET=latin1 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1; drop table t1;
create table t1 (a timestamp default '2005-05-05 01:01:01', #------------------------------------------------------------------------
b timestamp default '2005-05-05 01:01:01'); # Tests for Bug#6760 and Bug#12689
insert into t1 set a = now(); SET @row_count = 4;
select sleep(3); SET @sleep_time_per_result_row = 1;
sleep(3) SET @max_acceptable_delay = 2;
0 SET @@global.query_cache_size = 1024 * 64;
update t1 set b = now(); DROP TEMPORARY TABLE IF EXISTS t_history;
select timediff(b, a) >= '00:00:03' from t1; DROP TABLE IF EXISTS t1;
timediff(b, a) >= '00:00:03' CREATE TEMPORARY TABLE t_history (attempt SMALLINT,
start_ts DATETIME, end_ts DATETIME,
start_cached INTEGER, end_cached INTEGER);
CREATE TABLE t1 (f1 BIGINT);
INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1);
INSERT INTO t_history
SET attempt = 4 - 4 + 1, start_ts = NOW(),
start_cached = 0;
SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
f1 SLEEP(@sleep_time_per_result_row)
1 0
1 0
1 0
1 0
UPDATE t_history SET end_ts = NOW()
WHERE attempt = 4 - 4 + 1;
UPDATE t_history SET end_cached = 0
WHERE attempt = 4 - 4 + 1;
INSERT INTO t_history
SET attempt = 4 - 3 + 1, start_ts = NOW(),
start_cached = 0;
SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
f1 SLEEP(@sleep_time_per_result_row)
1 0
1 0
1 0
1 0
UPDATE t_history SET end_ts = NOW()
WHERE attempt = 4 - 3 + 1;
UPDATE t_history SET end_cached = 0
WHERE attempt = 4 - 3 + 1;
INSERT INTO t_history
SET attempt = 4 - 2 + 1, start_ts = NOW(),
start_cached = 0;
SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
f1 SLEEP(@sleep_time_per_result_row)
1 0
1 0
1 0
1 0
UPDATE t_history SET end_ts = NOW()
WHERE attempt = 4 - 2 + 1;
UPDATE t_history SET end_cached = 0
WHERE attempt = 4 - 2 + 1;
INSERT INTO t_history
SET attempt = 4 - 1 + 1, start_ts = NOW(),
start_cached = 0;
SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
f1 SLEEP(@sleep_time_per_result_row)
1 0
1 0
1 0
1 0
UPDATE t_history SET end_ts = NOW()
WHERE attempt = 4 - 1 + 1;
UPDATE t_history SET end_cached = 0
WHERE attempt = 4 - 1 + 1;
# Test 1: Does the query with SLEEP need a reasonable time?
SELECT COUNT(*) > 4 - 1 INTO @aux1 FROM t_history
WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
BETWEEN 0 AND @max_acceptable_delay;
SELECT @aux1 AS "Expect 1";
Expect 1
1 1
drop table t1; # Test 2: Does the query with SLEEP need a reasonable time even in case
set global query_cache_size=1355776; # of the non first execution?
create table t1 (a int); SELECT COUNT(*) > 4 - 1 - 1 INTO @aux2 FROM t_history
insert into t1 values (1),(1),(1); WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
create table t2 (a datetime default null, b datetime default null); BETWEEN 0 AND @max_acceptable_delay
insert into t2 set a = now(); AND attempt > 1;
select a from t1 where sleep(1); SELECT @aux2 AS "Expect 1";
a Expect 1
update t2 set b = now() where b is null;
insert into t2 set a = now();
select a from t1 where sleep(a);
a
update t2 set b = now() where b is null;
insert into t2 set a = now();
select a from t1 where sleep(1);
a
update t2 set b = now() where b is null;
select timediff(b, a) >= '00:00:03' from t2;
timediff(b, a) >= '00:00:03'
1 1
# Test 3: The query with SLEEP must be not cached.
SELECT COUNT(*) = 4 INTO @aux3 FROM t_history
WHERE end_cached = start_cached;
SELECT @aux3 AS "Expect 1";
Expect 1
1 1
1 DROP TABLE t1;
drop table t2; DROP TEMPORARY TABLE t_history;
drop table t1; SET @@global.query_cache_size = default;
set global query_cache_size=default;
create table t1 select INET_ATON('255.255.0.1') as `a`; create table t1 select INET_ATON('255.255.0.1') as `a`;
show create table t1; show create table t1;
Table Create Table Table Create Table

210
mysql-test/t/func_misc.test
View File

@ -94,36 +94,192 @@ show create table t1;
drop table t1; drop table t1;
# #
# Bug #6760: Add SLEEP() function # Bug#6760: Add SLEEP() function (feature request)
#
# Logics of original test:
# Reveal that a query with SLEEP does not need less time than estimated.
#
# Bug#12689: SLEEP() gets incorrectly cached/optimized-away
#
# Description from bug report (slightly modified)
#
# Bug 1 (happened all time):
# SELECT * FROM t1 WHERE SLEEP(1) will only result in a sleep of 1
# second, regardless of the number of rows in t1.
# Bug 2 (happened all time):
# Such a query will also get cached by the query cache, but should not.
#
# Notes (mleich, 2008-05)
# =======================
#
# Experiments around
# Bug#36345 Test 'func_misc' fails on RHAS3 x86_64
# showed that the tests for both bugs could produce in case of parallel
# artificial system time (like via ntpd)
# - decreases false alarm
# - increases false success
#
# We try here to circumvent these issues by reimplementation of the tests
# and sophisticated scripting, although the cause of the problems is a massive
# error within the setup of the testing environment.
# Tests relying on or checking derivates of the system time must never meet
# parallel manipulations of system time.
#
# Results of experiments with/without manipulation of system time,
# information_schema.processlist content, high load on testing box
# ----------------------------------------------------------------
# Definition: Predicted_cumulative_sleep_time =
# #_of_result_rows * sleep_time_per_result_row
#
# 1. Total (real sleep time) ~= predicted_cumulative_sleep_time !!
# 2. The state of a session within the PROCESSLIST changes to 'User sleep'
# if the sessions runs a statement containing the sleep function and the
# processing of the statement is just within the phase where the sleep
# is done. (*)
# 3. NOW() and processlist.time behave "synchronous" to system time and
# show also the "jumps" caused by system time manipulations. (*)
# 4. processlist.time is unsigned, the "next" value below 0 is ~ 4G (*)
# 5. Current processlist.time ~= current real sleep time if the system time
# was not manipulated. (*)
# 6. High system load can cause delays of <= 2 seconds.
# 7. Thanks to Davi for excellent hints and ideas.
#
# (*)
# - information_schema.processlist is not available before MySQL 5.1.
# - Observation of processlist content requires a
# - "worker" session sending the query with "send" and pulling results
# with "reap"
# - session observing the processlist parallel to the worker session
# "send" and "reap" do not work in case of an embedded server.
# Conclusion: Tests based on processlist have too many restrictions.
#
# Solutions for subtests based on TIMEDIFF of values filled via NOW()
# -------------------------------------------------------------------
# Run the following sequence three times
# 1. SELECT <start_time>
# 2. Query with SLEEP
# 3. SELECT <end_time>
# If TIMEDIFF(<end_time>,<start_time>) is at least two times within a
# reasonable range assume that we did not met errors we were looking for.
#
# It is extreme unlikely that we have two system time changes within the
# < 30 seconds runtime. Even if the unlikely happens, there are so
# frequent runs of this test on this or another testing box which will
# catch the problem.
# #
create table t1 (a timestamp default '2005-05-05 01:01:01',
b timestamp default '2005-05-05 01:01:01');
insert into t1 set a = now();
select sleep(3);
update t1 set b = now();
select timediff(b, a) >= '00:00:03' from t1;
drop table t1;
--echo #------------------------------------------------------------------------
--echo # Tests for Bug#6760 and Bug#12689
# Number of rows within the intended result set.
SET @row_count = 4;
# Parameter within SLEEP function
SET @sleep_time_per_result_row = 1;
# Maximum acceptable delay caused by high load on testing box
SET @max_acceptable_delay = 2;
# TIMEDIFF = time for query with sleep (mostly the time caused by SLEEP)
# + time for delays caused by high load on testing box
# Ensure that at least a reasonable fraction of TIMEDIFF is belongs to the SLEEP
# by appropriate setting of variables.
# Ensure that any "judging" has a base of minimum three attempts.
# (Test 2 uses all attempts except the first one.)
if (!` SELECT (@sleep_time_per_result_row * @row_count - @max_acceptable_delay >
@sleep_time_per_result_row) AND (@row_count - 1 >= 3)`)
{
--echo # Have to abort because of error in plausibility check
--echo ######################################################
--vertical_results
SELECT @sleep_time_per_result_row * @row_count - @max_acceptable_delay >
@sleep_time_per_result_row AS must_be_1,
@row_count - 1 >= 3 AS must_be_also_1,
@sleep_time_per_result_row, @row_count, @max_acceptable_delay;
exit;
}
SET @@global.query_cache_size = 1024 * 64;
--disable_warnings
DROP TEMPORARY TABLE IF EXISTS t_history;
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TEMPORARY TABLE t_history (attempt SMALLINT,
start_ts DATETIME, end_ts DATETIME,
start_cached INTEGER, end_cached INTEGER);
CREATE TABLE t1 (f1 BIGINT);
let $num = `SELECT @row_count`;
while ($num)
{
INSERT INTO t1 VALUES (1);
dec $num;
}
let $loops = 4;
let $num = $loops;
while ($num)
{
let $Qcache_queries_in_cache =
query_get_value(SHOW STATUS LIKE 'Qcache_queries_in_cache', Value, 1);
eval
INSERT INTO t_history
SET attempt = $loops - $num + 1, start_ts = NOW(),
start_cached = $Qcache_queries_in_cache;
SELECT *, SLEEP(@sleep_time_per_result_row) FROM t1;
#
# Do not determine Qcache_queries_in_cache before updating end_ts. The SHOW
# might cost too much time on an overloaded box.
eval
UPDATE t_history SET end_ts = NOW()
WHERE attempt = $loops - $num + 1;
let $Qcache_queries_in_cache =
query_get_value(SHOW STATUS LIKE 'Qcache_queries_in_cache', Value, 1);
eval
UPDATE t_history SET end_cached = $Qcache_queries_in_cache
WHERE attempt = $loops - $num + 1;
# DEBUG eval SELECT * FROM t_history WHERE attempt = $loops - $num + 1;
dec $num;
}
# 1. The majority of queries with SLEEP must need a reasonable time
# -> SLEEP has an impact on runtime
# = Replacement for original Bug#6760 test
# -> total runtime is clear more needed than for one result row needed
# = Replacement for one of the original Bug#12689 tests
--echo # Test 1: Does the query with SLEEP need a reasonable time?
eval SELECT COUNT(*) > $loops - 1 INTO @aux1 FROM t_history
WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
BETWEEN 0 AND @max_acceptable_delay;
SELECT @aux1 AS "Expect 1";
# #
# Bug #12689: SLEEP() gets incorrectly cached/optimized-away # 2. The majority of queries (the first one must be ignored) with SLEEP must
# need a reasonable time
# -> If we assume that the result of a cached query will be sent back
# immediate, without any sleep, than the query with SLEEP cannot be cached
# (current and intended behaviour for queries with SLEEP).
# -> It could be also not excluded that the query was cached but the server
# honoured somehow the SLEEP. Such a behaviour would be also acceptable.
# = Replacement for one of the original Bug#12689 tests
--echo # Test 2: Does the query with SLEEP need a reasonable time even in case
--echo # of the non first execution?
eval SELECT COUNT(*) > $loops - 1 - 1 INTO @aux2 FROM t_history
WHERE TIMEDIFF(end_ts,start_ts) - @sleep_time_per_result_row * @row_count
BETWEEN 0 AND @max_acceptable_delay
AND attempt > 1;
SELECT @aux2 AS "Expect 1";
# #
set global query_cache_size=1355776; # 3. The query with SLEEP should be not cached.
create table t1 (a int); # -> SHOW STATUS Qcache_queries_in_cache must be not incremented after
insert into t1 values (1),(1),(1); # the execution of the query with SLEEP
create table t2 (a datetime default null, b datetime default null); --echo # Test 3: The query with SLEEP must be not cached.
insert into t2 set a = now(); eval SELECT COUNT(*) = $loops INTO @aux3 FROM t_history
select a from t1 where sleep(1); WHERE end_cached = start_cached;
update t2 set b = now() where b is null; SELECT @aux3 AS "Expect 1";
insert into t2 set a = now(); #
select a from t1 where sleep(a); # Dump the content of t_history if one of the tests failed.
update t2 set b = now() where b is null; if (`SELECT @aux1 + @aux2 + @aux3 <> 3`)
insert into t2 set a = now(); {
select a from t1 where sleep(1); --echo # Some tests failed, dumping the content of t_history
update t2 set b = now() where b is null; SELECT * FROM t_history;
select timediff(b, a) >= '00:00:03' from t2; }
drop table t2; DROP TABLE t1;
drop table t1; DROP TEMPORARY TABLE t_history;
set global query_cache_size=default; SET @@global.query_cache_size = default;
# #
# Bug #21466: INET_ATON() returns signed, not unsigned # Bug #21466: INET_ATON() returns signed, not unsigned
@ -223,7 +379,7 @@ SELECT NAME_CONST('flag',-SQRT(4)) * MAX(a) FROM t1;
DROP TABLE t1; DROP TABLE t1;
# #
# Bug #27545: erroneous usage of NAME_CONST with a name as the first parameter # Bug #27545: erroneous usage of NAME_CONST with a name as the first parameter
# resolved against a column name of a derived table hangs the client # resolved against a column name of a derived table hangs the client
# #