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Diffstat (limited to 'mysql-test/main/query_cache_28249.test')
-rw-r--r-- | mysql-test/main/query_cache_28249.test | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/mysql-test/main/query_cache_28249.test b/mysql-test/main/query_cache_28249.test new file mode 100644 index 00000000..a08371fe --- /dev/null +++ b/mysql-test/main/query_cache_28249.test @@ -0,0 +1,113 @@ +### t/query_cache_28249.test ### +# +# Test for +# Bug#28249 Query Cache returns wrong result with concurrent insert / certain lock +# +# Last modification: +# 2008-11-27 mleich - Move this test out of query_cache.test +# - Fix Bug#40179 Test main.query_cache failing randomly on Pushbuild, +# test weakness +# - Minor improvements (comments,formatting etc.) +# + +--source include/have_query_cache.inc +--source include/not_embedded.inc + +SET @query_cache_type= @@global.query_cache_type; +SET @query_cache_limit= @@global.query_cache_limit; +SET @query_cache_min_res_unit= @@global.query_cache_min_res_unit; +SET @query_cache_size= @@global.query_cache_size; + +--echo # Bug#28249 Query Cache returns wrong result with concurrent insert/ certain lock +connect (user1,localhost,root,,test,,); +connect (user2,localhost,root,,test,,); +connect (user3,localhost,root,,test,,); + +connection user1; + +SET GLOBAL query_cache_type=1; +SET GLOBAL query_cache_limit=10000; +SET GLOBAL query_cache_min_res_unit=0; +SET GLOBAL query_cache_size= 102400; + +FLUSH TABLES; +--disable_warnings +DROP TABLE IF EXISTS t1, t2; +--enable_warnings +CREATE TABLE t1 (a INT); +CREATE TABLE t2 (a INT); +INSERT INTO t1 VALUES (1),(2),(3); + +connection user2; +LOCK TABLE t2 WRITE; + +connection user1; +--echo # "send" the next select, "reap" the result later. +--echo # The select will be blocked by the write lock on the t1. +let $select_for_qc = +SELECT *, (SELECT COUNT(*) FROM t2) FROM t1; +send; +eval $select_for_qc; + +connection user3; +# Typical information_schema.processlist content after sufficient sleep time +# ID USER COMMAND TIME STATE INFO +# .... +# 2 root Query 5 Waiting for table metadata lock SELECT *, (SELECT COUNT(*) FROM t2) FROM t1 +# .... +# XXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX +# The values marked with 'X' must be reached. +--echo # Poll till the select of connection user1 is blocked by the write lock on t1. +let $wait_condition= SELECT COUNT(*) = 1 FROM information_schema.processlist +WHERE state = 'Waiting for table metadata lock' + AND info = '$select_for_qc'; +--source include/wait_condition.inc +eval +SELECT user,command,state,info FROM information_schema.processlist +WHERE state = 'Waiting for table metadata lock' + AND info = '$select_for_qc'; +INSERT INTO t1 VALUES (4); + +connection user2; +UNLOCK TABLES; + +connection user1; +# +# Since the lock ordering rule in thr_multi_lock depends on +# pointer values, from execution to execution we might have +# different lock order, and therefore, sometimes lock t1 and block +# on t2, and sometimes block on t2 right away. In the second case, +# the following insert succeeds, and only then this select can +# proceed, and we actually test nothing, as the very first select +# returns 4 rows right away. +# It's fine to have a test case that covers the problematic area +# at least once in a while. +--echo # Collecting ("reap") the result from the previously blocked select. +--echo # The printing of the result (varies between 3 and 4 rows) set has to be suppressed. +--disable_result_log +--reap +--enable_result_log + +connection user3; +--echo # The next select enforces that effects of "concurrent_inserts" like the +--echo # record with a = 4 is missing in result sets can no more happen. +SELECT 1 FROM t1 WHERE a = 4; + +connection user1; +--echo # The next result set must contain 4 rows. +# If not, we have a regression of Bug#28249 +eval $select_for_qc; +RESET QUERY CACHE; +eval $select_for_qc; + +DROP TABLE t1,t2; + +connection default; +disconnect user1; +disconnect user2; +disconnect user3; + +SET GLOBAL query_cache_type= @query_cache_type; +SET GLOBAL query_cache_limit= @query_cache_limit; +SET GLOBAL query_cache_min_res_unit= @query_cache_min_res_unit; +SET GLOBAL query_cache_size= @query_cache_size; |