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# Bug#3254121: MANY THREADS IN OS_EVENT, SYSTEM SLOWDOWN/HANG
# This test verifies that the server does not slowdown/hang
# while loading a tablespace while a large number of other
# connections have opened more temporary tablespaces than
# the variable inodb_open_files.
SELECT @@innodb_thread_concurrency, @@innodb_open_files;
# MTR limits number of connections to 128 only.
--let $tables_count=50
--let $count_mtr=110
--let $count_exec=500
--let $num_table=0
# All the tablespaces except the undo tablespaces and system tablespaces are
# added to a LRU list of size innodb_open_files. When this list if full
# and a new file needs to be added to it, the oldest file is removed and closed
# to make room for a new file.
# The temporary tables used to be not added in the LRU list which could cause
# server to hang with big number of connections.
--echo # Create more tables than open file limit (which is 40) to fill up the
--echo # LRU list.
while($num_table < $tables_count){
--eval CREATE TABLE g$num_table(id INT PRIMARY KEY) ENGINE=INNODB
--inc $num_table
}
--echo # Open $count_mtr connections and create a temporary table
--echo # for each connection.
--let $conn_count=0
while($conn_count < $count_mtr){
--connect (con$conn_count, localhost, root,,)
CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB;
INSERT INTO t1 VALUES (1);
--inc $conn_count
}
--echo # Insert rows in tables using multiple connections.
--let $conn_count=0
while($conn_count < $count_mtr){
--connection con$conn_count
--send_eval INSERT INTO g0 VALUE ($conn_count)
--inc $conn_count
}
--echo # Wait for the connections to finish inserting rows.
--let $conn_count=0
while($conn_count < $count_mtr){
--connection con$conn_count
--reap
--inc $conn_count
}
--echo # Cleanup.
--echo # Disconnect the connections.
--connection default
--let $conn_count=0
while($conn_count<$count_mtr){
--disconnect con$conn_count
--inc $conn_count
}
CREATE TABLE connections_done(id INT PRIMARY KEY);
--let $conn_count=0
while($conn_count < $count_exec){
--exec_in_background $MYSQL -e "USE test; CREATE TEMPORARY TABLE t1(id INT PRIMARY KEY) ENGINE=INNODB; INSERT INTO t1 VALUES (1); SELECT SLEEP(5); INSERT INTO connections_done VALUES ($conn_count);"
--inc $conn_count
}
--let $wait_condition=SELECT COUNT(*)=$count_exec from connections_done
--source include/wait_condition_or_abort.inc
--echo # Drop all the tables
DROP TABLE connections_done;
--let $num_table=0
while($num_table < $tables_count){
--eval DROP TABLE g$num_table
--inc $num_table
}
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