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# ==== Purpose ====
#
# Test verifies that replication shouldn't hang when number of active threads
# on the slave server are less than the allowed innodb_thread_concurrency value.
#
# ==== Implementation ====
#
# Steps:
# 0 - Have master slave replication setup with engine being Innodb.
# 1 - Configure innodb_thread_concurrency = 100.
# 2 - Do some DML on master and sync the slave with master.
# 3 - Ensure replication doesn't hang.
#
# ==== References ====
#
# MDEV-20247: Replication hangs with "preparing" and never starts
#
--source include/master-slave.inc
--source include/have_innodb.inc
--connection slave
SET @old_innodb_thread_concurrency := @@innodb_thread_concurrency;
SET @old_innodb_thread_sleep_delay := @@innodb_thread_sleep_delay;
SET GLOBAL innodb_thread_concurrency = 100;
--connection master
CREATE TABLE t(f INT) ENGINE=INNODB;
INSERT INTO t VALUES (10);
--sync_slave_with_master
--let $diff_tables=master:t, slave:t
--source include/diff_tables.inc
--echo "===== Clean up======="
--connection master
DROP TABLE t;
--sync_slave_with_master
SET GLOBAL innodb_thread_concurrency = @old_innodb_thread_concurrency;
SET GLOBAL innodb_thread_sleep_delay = @old_innodb_thread_sleep_delay;
--source include/rpl_end.inc
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