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MDEV#6206: wsrep_slave_threads subtracts from max_connections

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Decoupled wsrep thread count from connection count. By doing so,
the number of wsrep threads (applier/rollbacker) would no longer
affect the threads_connected status variable and thus maximum
allowable user connections limit would be @@max_connections.

Also introduced a new status variable 'wsrep_thread_count' to hold
the number of wsrep applier/rollbacker threads.

Added a test case.
This commit is contained in:
Nirbhay Choubey
2014-05-08 14:45:00 -04:00
parent 93a403bf1d
commit 00b6fff2e7
4 changed files with 124 additions and 7 deletions
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44
mysql-test/suite/wsrep/t/variables.test
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@ -16,4 +16,48 @@ SET GLOBAL wsrep_replicate_myisam= ON;
# Reset it back.
SET GLOBAL wsrep_replicate_myisam= OFF;
--echo
--echo #
--echo # MDEV#6206: wsrep_slave_threads subtracts from max_connections
--echo #
call mtr.add_suppression("safe_mutex: Found wrong usage of mutex 'LOCK_wsrep_slave_threads' and 'LOCK_global_system_variables'");
call mtr.add_suppression("WSREP: Failed to get provider options");
SELECT @@global.wsrep_provider;
SELECT @@global.wsrep_slave_threads;
SELECT @@global.wsrep_cluster_address;
SHOW STATUS LIKE 'threads_connected';
SHOW STATUS LIKE 'wsrep_thread_count';
--echo
eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
SELECT @@global.wsrep_provider;
SELECT @@global.wsrep_cluster_address;
SHOW STATUS LIKE 'threads_connected';
SHOW STATUS LIKE 'wsrep_thread_count';
--echo
--echo # Setting wsrep_cluster_address triggers the creation of
--echo # applier/rollbacker threads.
SET GLOBAL wsrep_cluster_address= 'gcomm://';
--echo # Wait for applier threads to get created.
sleep 3;
SELECT @@global.wsrep_provider;
SELECT @@global.wsrep_cluster_address;
SHOW STATUS LIKE 'threads_connected';
SHOW STATUS LIKE 'wsrep_thread_count';
--echo
SET @wsrep_slave_threads_saved= @@global.wsrep_slave_threads;
SET GLOBAL wsrep_slave_threads= 10;
--echo # Wait for applier threads to get created.
sleep 3;
SHOW STATUS LIKE 'threads_connected';
SHOW STATUS LIKE 'wsrep_thread_count';
# reset (for mtr internal checks)
SET GLOBAL wsrep_slave_threads= @wsrep_slave_threads_saved;
SET GLOBAL wsrep_cluster_address= '';
SET GLOBAL wsrep_provider= 'none';
--echo # End of test.