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mysql-test/t/query_cache_28249.test: Test depends on process state (not updated under embedded)
125 lines
4.1 KiB
Plaintext
125 lines
4.1 KiB
Plaintext
### t/query_cache_28249.test ###
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#
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# Test for
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# Bug#28249 Query Cache returns wrong result with concurrent insert / certain lock
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#
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# Last modification:
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# 2008-11-27 mleich - Move this test out of query_cache.test
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# - Fix Bug#40179 Test main.query_cache failing randomly on Pushbuild,
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# test weakness
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# - Minor improvements (comments,formatting etc.)
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#
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--source include/have_query_cache.inc
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--source include/not_embedded.inc
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SET @query_cache_type= @@global.query_cache_type;
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SET @query_cache_limit= @@global.query_cache_limit;
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SET @query_cache_min_res_unit= @@global.query_cache_min_res_unit;
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SET @query_cache_size= @@global.query_cache_size;
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--echo # Bug#28249 Query Cache returns wrong result with concurrent insert/ certain lock
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--echo # Establish connections user1,user2,user3 (user=root)
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connect (user1,localhost,root,,test,,);
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connect (user2,localhost,root,,test,,);
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connect (user3,localhost,root,,test,,);
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--echo # Switch to connection user1
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connection user1;
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SET GLOBAL query_cache_type=1;
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SET GLOBAL query_cache_limit=10000;
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SET GLOBAL query_cache_min_res_unit=0;
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SET GLOBAL query_cache_size= 100000;
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FLUSH TABLES;
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--disable_warnings
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DROP TABLE IF EXISTS t1, t2;
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--enable_warnings
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CREATE TABLE t1 (a INT);
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CREATE TABLE t2 (a INT);
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INSERT INTO t1 VALUES (1),(2),(3);
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--echo # Switch to connection user2
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connection user2;
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LOCK TABLE t2 WRITE;
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--echo # Switch to connection user1
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connection user1;
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--echo # "send" the next select, "reap" the result later.
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--echo # The select will be blocked by the write lock on the t1.
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let $select_for_qc =
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SELECT *, (SELECT COUNT(*) FROM t2) FROM t1;
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send;
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eval $select_for_qc;
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--echo # Switch to connection user3
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connection user3;
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# Typical information_schema.processlist content after sufficient sleep time
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# ID USER COMMAND TIME STATE INFO
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# ....
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# 2 root Query 5 Locked SELECT *, (SELECT COUNT(*) FROM t2) FROM t1
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# ....
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# XXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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# The values marked with 'X' must be reached.
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--echo # Poll till the select of connection user1 is blocked by the write lock on t1.
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let $wait_condition= SELECT COUNT(*) = 1 FROM information_schema.processlist
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WHERE state = 'Locked'
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AND info = '$select_for_qc';
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--source include/wait_condition.inc
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eval
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SELECT user,command,state,info FROM information_schema.processlist
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WHERE state = 'Locked'
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AND info = '$select_for_qc';
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INSERT INTO t1 VALUES (4);
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--echo # Switch to connection user2
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connection user2;
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UNLOCK TABLES;
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--echo # Switch to connection user1
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connection user1;
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#
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# Since the lock ordering rule in thr_multi_lock depends on
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# pointer values, from execution to execution we might have
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# different lock order, and therefore, sometimes lock t1 and block
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# on t2, and sometimes block on t2 right away. In the second case,
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# the following insert succeeds, and only then this select can
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# proceed, and we actually test nothing, as the very first select
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# returns 4 rows right away.
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# It's fine to have a test case that covers the problematic area
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# at least once in a while.
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--echo # Collecting ("reap") the result from the previously blocked select.
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--echo # The printing of the result (varies between 3 and 4 rows) set has to be suppressed.
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--disable_result_log
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--reap
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--enable_result_log
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--echo # Switch to connection user3
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connection user3;
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--echo # The next select enforces that effects of "concurrent_inserts" like the
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--echo # record with a = 4 is missing in result sets can no more happen.
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SELECT 1 FROM t1 WHERE a = 4;
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--echo # Switch to connection user1
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connection user1;
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--echo # The next result set must contain 4 rows.
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# If not, we have a regression of Bug#28249
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eval $select_for_qc;
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RESET QUERY CACHE;
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eval $select_for_qc;
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DROP TABLE t1,t2;
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--echo # Switch to connection default + close connections user1,user2,user3
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connection default;
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disconnect user1;
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disconnect user2;
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disconnect user3;
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SET GLOBAL query_cache_type= @query_cache_type;
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SET GLOBAL query_cache_limit= @query_cache_limit;
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SET GLOBAL query_cache_min_res_unit= @query_cache_min_res_unit;
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SET GLOBAL query_cache_size= @query_cache_size;
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